pls upload your amp and tell us opinion and experience, or difficulties while making your own amp/ headphone amp. thanks
DIY Amp club, Post your DIY amp here
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 Apr 20 2005, 09:59 AM, updated 19y ago
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#1
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang 
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Apr 20 2005, 10:08 AM
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#2
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP 
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DIY (assembling) is pretty much a piece of cake if you had quality components and didn't screw up. designing and making ur own is another story
  here is my Gilmore Dynalo, got 2 pieces of the board, suppose to build a balanced version but i guess i don't have that much budget atm...will only be using one for stereo. the one on the left is obviously the psu board. No idea how much is the retail yet as headamp.com did not show any interest in this amp compared to other Kevin Gilmore's amp. retail for Dynahi is USD1799....i guess Dynalo should be about 30% less. will be getting the parts tomorrow and expecting this to be completed(less enclosure) by end of the month....hopefully. this gonna be my homeamp for some time...dont feel like feeding my sr-71 too much  EDIT: oh screw it.....transformer lead time May-03......  EDIT#2: ok, being a little cheap...sample opamps will be shipped in May 18, wont be seeing this baby in action until june  but this delay save me RM120  |
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Apr 20 2005, 08:20 PM
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#3
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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WOW... so nice...alamaklor, can tell me where to get PCB or the OP-AMP to built Cmoy amp? i try to search in some electronic component shop in sarawak, failed to get it. so might request help from friend in KL to buy for me.
This post has been edited by PcWork: Apr 20 2005, 08:20 PM |
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Apr 20 2005, 09:43 PM
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#4
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(PcWork @ Apr 20 2005, 09:20 AM) WOW... so nice...alamaklor, can tell me where to get PCB or the OP-AMP to built Cmoy amp? i try to search in some electronic component shop in sarawak, failed to get it. so might request help from friend in KL to buy for me. you will only need universal/multipurpose pcb to make a cmoy  no need waste money to buy pre-etched and nciely printed pcb  I'm gonna stocking on parts for my Dynalo now, if you need OPamp please pm me, i'll suggest which one you should go with and the price. I'm starting a bulk in bulk section for OPamps and whatever electronics stuff.....check that out. |
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Apr 21 2005, 07:00 PM
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#5
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Senior Member
2,687 posts Joined: Jan 2003 From: Sue Bunk Jai Yaa!
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erk...can anione build me a headphone amp?
how much the average production cost for mid highend headphone amp? |
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Apr 21 2005, 07:05 PM
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#6
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(junkieG @ Apr 21 2005, 08:00 AM) erk...can anione build me a headphone amp? yes, check out the bulk in my sig.how much the average production cost for mid highend headphone amp? bout RM500 |
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May 12 2005, 12:22 AM
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#7
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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okie, got my parts yesterday, worked my @ss off and got the psu and amp part done
problem is that i accidentally bought a bunch of 200"k" rohm resistor instead of 200ohm resistor  so gotta order it again  some missing caps and voltage regulators are in another order that i have not placed some pimping pics:psu, amp, and solder side. http://img.photobucket.com/albums/v232/kin0kin2/9ffdba84.jpg      |
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May 12 2005, 02:27 AM
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#8
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Senior Member
6,358 posts Joined: Jan 2003
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nice work there. i bought PCBs for the Dynahi sometime back, but sold it cause i didnt have the time and equipment to build it...plus im rather happy with my perreaux..
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May 12 2005, 02:50 AM
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#9
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(Jason @ May 11 2005, 03:27 PM) nice work there. i bought PCBs for the Dynahi sometime back, but sold it cause i didnt have the time and equipment to build it...plus im rather happy with my perreaux.. lol tyty.initially i wanted to build a balanced dynahi, then i check out the cost and the expression was "wow, and ouch". well then i decided to go with balanced dynalo, bought the board and when i double check the order, it was anotehr "ouch" so in the end, a stereo dynalo |
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May 12 2005, 02:56 AM
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Senior Member
1,919 posts Joined: Jan 2003 From: KL
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a headphone amp can cost so much, i had never think of it, however, is the quality good?
no $ to built 1, sigh |
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May 12 2005, 03:04 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(howiechoo @ May 11 2005, 03:56 PM) a headphone amp can cost so much, i had never think of it, however, is the quality good? havent heard of it wor, still in progress as stated in above post. wont be seeing it until end of the month (end of may). cant get a decent heatsink that is < 2" tall. troublesome troublesome no $ to built 1, sigh  btw, a palm size amp can already cost near RM2k....depending on the construction and design of the circuit. |
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May 12 2005, 12:31 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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alamaklor, try to look for CPU heatzink for 486 CPU? or mod (cut) it from current P4 headzink? will it be easier? it is soft to cut with powertools.
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May 12 2005, 12:38 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(PcWork @ May 12 2005, 01:31 AM) alamaklor, try to look for CPU heatzink for 486 CPU? or mod (cut) it from current P4 headzink? will it be easier? it is soft to cut with powertools. i need something quite short and wide. about 1.5" H X 6" W (or more) X 1-2" D. cant get something too small, must be within that surface area.heatsink = heatzink = headzink? |
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May 12 2005, 12:50 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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alamaklor i really want somethings for make my cmoy, but the problems is i can't even get a standard PCB at my place... =~( not to mention the opa amp.
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May 12 2005, 02:06 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(PcWork @ May 12 2005, 01:50 AM) alamaklor i really want somethings for make my cmoy, but the problems is i can't even get a standard PCB at my place... =~( not to mention the opa amp. so u want me to get it for you? it can be done, im gonna make my order soon...again. |
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May 12 2005, 02:35 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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can you pls tell me the price through PM? i really want it... i really sad for asking to some shop here : i want this this this opa amp.. you got? , then i get the answer : "what is that???"
i even print the photo of the opa amp and ask them to post for me. but guess what... they said that is not exits.... =~( |
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May 12 2005, 03:00 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(PcWork @ May 12 2005, 03:35 AM) can you pls tell me the price through PM? i really want it... i really sad for asking to some shop here : i want this this this opa amp.. you got? , then i get the answer : "what is that???" well, my answer would be: anything u want.i even print the photo of the opa amp and ask them to post for me. but guess what... they said that is not exits.... =~( just click on the link on my sig and check out the site there for the specific opamp that u need, i've got a bunch here though and dude, do it quick, im really really really gonna order the stuff soon, end of this week probably. as for the price, just estimate 20% more (probably enough to cover shipping to msia) based on 3.9 conversion rate. |
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May 12 2005, 04:30 PM
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Senior Member
3,813 posts Joined: Jan 2003
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oh man..u guys indeed so PRO While LOADED!!
I dunno waht u guys talking bout... How to start my first lesson bout creating Headphone AMp? Any site for Noobie like me? I mean start from baby language ...dun provide me like Master language..I will try to catch up watever i understand wif my capabilities. thx.! .tsk tsk tsk..this sub-forum got lotsa serious dude! |
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May 12 2005, 04:38 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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there are many sites out there that explain how to build a simple headphone amp, with a single voltage gain stage.
http://www.tangentsoft.net/audio/ http://www.headwize.com |
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May 14 2005, 01:37 AM
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Junior Member
15 posts Joined: Apr 2005
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AlamakLor, do u have any circuit diagrams for those headamp tat they'd built over at head-fi? I'm thinking of making 1 for myself... would help a lot if circuits are available coz it'll b valuable references....
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May 14 2005, 01:50 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(IcE @ May 13 2005, 02:37 PM) AlamakLor, do u have any circuit diagrams for those headamp tat they'd built over at head-fi? I'm thinking of making 1 for myself... would help a lot if circuits are available coz it'll b valuable references.... headwize.com have a large collection, audiologica (tangent) have ppa, pimeta, mint, and cmoy(not really a diagram fro cmoy). kevin gilmore's site have a couple of his design up there. headamp.com have a couple of kevin gilmore's design as well, in fact, it's the final schematic for all his amps. best of all, design your own. |
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May 14 2005, 10:54 AM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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alamaklor.... so sad i don't even can get a PCB at my place... damn..
if you help me to buy all needed stuff for a cmoy, let say 3 pair of complete component, and post to my place will cost much or not? |
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May 14 2005, 11:40 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(PcWork @ May 13 2005, 11:54 PM) alamaklor.... so sad i don't even can get a PCB at my place... damn.. RM10 to post to you if you help me to buy all needed stuff for a cmoy, let say 3 pair of complete component, and post to my place will cost much or not? just like pos laju haha but it will take 9 business days, about 2 weeks to be precise. just wondering if uw ant me to build the whole thing for you, i'll be picking some enclosure for some pocket amps that could tkae in 2 X 9v bout USD11 each. |
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May 14 2005, 06:58 PM
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Junior Member
15 posts Joined: Apr 2005
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Thanks ya. I'm gonna design 1... so need references... coz doesnt know how much amplification a typical H-amp need oso...
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May 14 2005, 11:04 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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alamaklor, if complete cmoy set and u send it to me, will cost average how much? can get it below RM 90-RM100?
myself i think i need two.. because will use 2 headphone together ( me and my gf) when watching dvd movie. but my hand also too ichy to try do it myself, but afraid spoil it also... =( |
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May 14 2005, 11:25 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(PcWork @ May 14 2005, 12:04 PM) alamaklor, if complete cmoy set and u send it to me, will cost average how much? can get it below RM 90-RM100? no way myself i think i need two.. because will use 2 headphone together ( me and my gf) when watching dvd movie. but my hand also too ichy to try do it myself, but afraid spoil it also... =( u can simply check out ebay to see what price they are running now. |
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May 16 2005, 10:36 AM
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Junior Member
214 posts Joined: Jan 2003
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Guys,
Got a question. What do you think of the DIY integrated amps compared with commercial ready-made ones, such as Marantz etc. In terms of cost/performance. I'm looking for such an amp for my entry-level setup, to match my floorstanding Wharefale speakers. Are there people out there who custom-make such int amps? |
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May 16 2005, 10:43 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(barry @ May 15 2005, 11:36 PM) Guys, depending on the circuit, it's not easy to clone the exact same thing as different components are used so it's even harder to compare a diy amp from a commercial amp. Got a question. What do you think of the DIY integrated amps compared with commercial ready-made ones, such as Marantz etc. In terms of cost/performance. I'm looking for such an amp for my entry-level setup, to match my floorstanding Wharefale speakers. Are there people out there who custom-make such int amps? btw, it is called integrated amp because it is integrated into a receiver/player, better just use the term amp here. some of the commercial amps have very simple circuit, some don't. usually, if u know what u are doing...it is cheaper to make your own than to buy a commercial one. sound-wise, really depends on what kind of sound you are aiming to get in return so usually the price:performance is better asthetic wise maybe not. |
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May 17 2005, 06:17 AM
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Junior Member
13 posts Joined: Apr 2005
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I'm new here...
Can someone guide me? I want to build my own amp too... Starting with low power ones... |
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May 17 2005, 10:30 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(snOOkie @ May 16 2005, 07:17 PM) I'm new here... there are 2 links in the 1st page where you may find very helpful Can someone guide me? I want to build my own amp too... Starting with low power ones... |
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May 17 2005, 12:07 PM
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Senior Member
3,813 posts Joined: Jan 2003
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Anyone wanna form a Head Amp DIY gathering here? I am noobs here..Dun haf Electric-Brain & Electric-Tools... But i wan to haf a Headamp..
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May 20 2005, 09:41 PM
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Senior Member
8,186 posts Joined: May 2005 From: Beaumont, Baile Ath Cliath, EIRE. 
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"btw, it is called integrated amp because it is integrated into a receiver/player, better just use the term amp here."
Minor corrections on the terms here. Integrated amplifier is when the preamp and the power amplifier is built in one unit/housing. Integrated amplifier plus a tuner is called a receiver. By this time you could have guessed what a casseiver will be... Just my 2 sens worth... |
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May 20 2005, 10:35 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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TQ for sharing your knowledge.. =D
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May 21 2005, 03:38 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(jazzy939 @ May 20 2005, 10:41 AM) "btw, it is called integrated amp because it is integrated into a receiver/player, better just use the term amp here." yes sir that is the correct term Minor corrections on the terms here. Integrated amplifier is when the preamp and the power amplifier is built in one unit/housing. Integrated amplifier plus a tuner is called a receiver. By this time you could have guessed what a casseiver will be... Just my 2 sens worth... thank you for the correction |
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May 21 2005, 10:56 PM
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Senior Member
3,329 posts Joined: Jan 2003 From: Selangor
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I prefer building tube amps. Anyone here has a nice source for good china made output trans?
Cannot aford those lundahl and tamuras :  :I plan to start my tube amp build with this kit. The slowly upgrade it. http://www.diyhifisupply.com/diyhs_ella.htm This post has been edited by yushin: May 21 2005, 11:08 PM |
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May 23 2005, 04:13 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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Weight: 21Kg <-- wow....
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May 24 2005, 11:33 AM
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Junior Member
15 posts Joined: Apr 2005
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I think it's not realli cheap compared to other amp.... but the specs aint tat good.... Upgrading it requires some knowledge about the circuits, and the contributing components. I think AMB's M3 amplifier is almost the same price as the tube u're refering to. Sound wise, i think u could ask AlamakLor coz he's the only one tat's probably have access to these high end stuffs... But based on the specs and design considerations, i think it's a very good amp for high-end DIYers.
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May 24 2005, 11:56 AM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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i built a DIY Cmoy amp a couple of years ago, and it's still working today. i used Burr-Brown OPA2604 dual-channel opamp (which is overkill, as it sucks the juice from the batteries like crazy).
the performance on my Sennheiser HD590 headphones: heavenly! did i say it sounded heavenly? yep. HEAVENLY! i built it when i was in UK, but here i don't know which shop can supply an OPA1302 (or other similar singla channel opamps). but now my headphones have gone kaput: only right side got sound. here are the pics of my amp. looks f**kin ugly, sounds f**kin amazing. the guts  naked  in the case  This post has been edited by modD: May 24 2005, 06:59 PM |
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May 25 2005, 02:12 PM
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Senior Member
975 posts Joined: Sep 2004 From: Setapak
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u can get burr brown or analog device from rs malaysia(shah alam) or farnell(somewhere jalan 222 i think)
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May 25 2005, 05:16 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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haha terkejut got same avatar with me, though i never post this msg before. hehehehehe i always cam the avatar any my start to know what post i posted when scrolling fast down with logitech cruise button. hehehehehe
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May 25 2005, 10:56 PM
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Senior Member
869 posts Joined: Jan 2003 From: S.Damansara 
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anyone willing to DIY headphone amp and sell it off ..
im a willing buyer muahahahahahaha |
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May 25 2005, 11:13 PM
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Elite
4,424 posts Joined: Jan 2003 From: Singapore 
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error, contact alamaklor !
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May 26 2005, 12:17 AM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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yay~~~ complete the list of part required to make the cmoy. i will study more about the layout before begin to make it. already have 100% component for 2 cmoy on my hand, except the housing for it. perhaps thinking of using some plastic or arylic to do it myself.
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May 26 2005, 06:22 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(error @ May 25 2005, 11:56 AM) anyone willing to DIY headphone amp and sell it off .. im a willing buyer muahahahahahaha here here, what's your budget and what do u want on it? |
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Jun 3 2005, 01:39 PM
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Junior Member
183 posts Joined: May 2005
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blackflam interested with AlamakLor's product too!! Lai lai laiii.. AlamakLor going to >>BUILD IN BULK<<
lol.. you wont charge us so much ya, dear moderator~ *act cute n shiney eyes* This post has been edited by blackflam: Jun 3 2005, 01:44 PM |
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Jun 3 2005, 01:47 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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well if you a female with cute and shiney eyes, perhaps he will consider. if you a guy with cute and shiney eye, maybe he will charge you double....=P
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Jun 3 2005, 06:40 PM
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Junior Member
183 posts Joined: May 2005
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Hahaha. Well, should I say "I am a lesbian trapped in a man's body" ?
forgot whose signature is that.. always seen that around. gavlim issit? lol. AlamakLor, will you double charge me for having a cute and shiney eyes? |
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Jun 4 2005, 12:53 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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erm.. wait to see either alamaklor interested in a lesbian that traped in male body loh.
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Jun 5 2005, 07:14 AM
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Junior Member
61 posts Joined: Feb 2005
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TAKE A LOOK!!!
Attached thumbnail(s) 
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Jun 5 2005, 07:37 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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i remember a us company, buying a china amp that looks almost exactly like the one you posted, rebadged it and sold it at a few times higher.....in the end the owner got caught but still denies it.
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Jun 5 2005, 08:52 AM
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Junior Member
61 posts Joined: Feb 2005
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QUOTE(AlamakLor @ Jun 5 2005, 07:37 AM) i remember a us company, buying a china amp that looks almost exactly like the one you posted, rebadged it and sold it at a few times higher.....in the end the owner got caught but still denies it. No, not really. Nowdays, almost all the low or middle level amps are made by china's amp factories. exspecially, the tube amps. They all OEM from the Chinese companies. Like the above photo's tube amp, it is made by one of the most powerful Chinese tube factory. As I know, serval companies like one Germanic and one Hongkong tube company has OEM this model. And this model sale in China for 3800RMB, But sale in Malaysia for 3800RM. |
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Jun 5 2005, 08:58 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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well, thats the thing, they called it "OEM" but dude, the chinese company was never in contract as their OEM. they rebadged other's product without the manufacturer's consent. it's almost like pirating. but i think it cant be help, consumer has to beware of this kind of things.
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Jun 5 2005, 01:07 PM
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Senior Member
8,046 posts Joined: Jan 2003
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QUOTE(lakeiblue @ Jun 5 2005, 08:52 AM) And this model sale in China for 3800RMB, But sale in Malaysia for 3800RM. I hope you're not forgetting that there're local taxes, overheads and probably middle man's profits that add on to the actual price. Local Hifi stuff sold are never cheap, used gear is probably the best route to get cheap. |
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Jun 5 2005, 01:45 PM
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Staff
4,380 posts Joined: Mar 2005 From: petaling jaya,puchong jaya,pandan jaya,putra jaya
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not all the time import stuff are more expensive.just an example here.here a supra av3 component cable(bulk) selling at rm 50 per meter.but in u.k is selling at 65 pound per meter.cable tax are much more higher than electrical stuff
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Jun 5 2005, 02:52 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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offtopic sorry.
bsl555 : what opaamp you still have? can pls PM me what you have? will need to buy some also after i go back to KL serdang. |
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Jun 5 2005, 11:58 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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anyone who interested to buy a high quality cmoy, pls do PM alamaklor. i also learn how to make cmoy from him.
mine cmoy is 90% complete. =P |
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Jun 6 2005, 03:07 PM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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i'm in the process of transferring my cmoy into a new enclosure. that also includes getting a new circuitboard and new wiring jobs etc...
because of this small amp, my whole room is in a mess! but i'm worried about unsoldering the opamp from the old pcb... can excess heat damage it? |
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Jun 6 2005, 03:09 PM
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Senior Member
3,813 posts Joined: Jan 2003
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PCwork..
fast fast finishing it !...Can u post some screenshots of ur 90% completed CMoy? |
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Jun 6 2005, 04:55 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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modD : of course excess heat will kill it. that's why many ppl use a socket instead of wireing it directly on PCB
dinodog_Jr: here you goes~    |
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Jun 6 2005, 06:42 PM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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looks like an 8 pin socket from pasar road is due soon...
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Jun 6 2005, 08:40 PM
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Senior Member
6,358 posts Joined: Jan 2003
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no offense but thats some pretty bad soldering (kinda like how I SOLDER)
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Jun 6 2005, 09:39 PM
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Elite
3,001 posts Joined: Jan 2003 From: KL, M'sia 
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QUOTE(yushin @ May 21 2005, 10:56 PM) I prefer building tube amps. Anyone here has a nice source for good china made output trans? i got my trans from rs (www.rsmalaysia.com)... u might wanna try Farnell too (my.farnell.com)Cannot aford those lundahl and tamuras : :I plan to start my tube amp build with this kit. The slowly upgrade it. http://www.diyhifisupply.com/diyhs_ella.htm wow.. the kit look nice... but it doesn't come cheap... u might wanna play around with some lower budget tube first... check out this www.my3c.net |
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Jun 6 2005, 10:19 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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Jason no choise, i am using an solder which is 38CM long, and the solder head = 1cm wide, blade shape to do this small works. that is my daddy solder, he get that around 20 years ago in singapore, the tip is made with 100% copper.... and doesn't plan to get a new one. because i got mine in KL. hahaha =P
using a 1CM tip to do soldering work on a 0.9mm hole. but this one i made really cin chai because i wanna complete it really fast. =P but due to some part i bought mistakely, and failed to pair up the resistor, have to delay the amp progress another two weeks loh. =( i built this on a normal PCB which can be found on malaysia. after i done this and confirmed that it work fine, will write a very detail step by step and component buying guide and post it here for anyone who interested to built a cmoy with part that they could find in malaysia. This post has been edited by PcWork: Jun 6 2005, 11:02 PM |
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Jun 6 2005, 11:03 PM
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Senior Member
975 posts Joined: Sep 2004 From: Setapak
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it's ok..first time, PcWork??
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Jun 6 2005, 11:39 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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er.... not first time job with PCB, before this doing quite a lot work on modification on speaker amp PCB, changing some caps and wire on speaker,by pass this by pass that on speaker.. but first time on building headphone amp. becuase i am so slow on study that there's a nice amp that can be carry around. and i learn that after i come to lowyat.net
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Jun 7 2005, 12:07 AM
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Junior Member
183 posts Joined: May 2005
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keep up the great work. We are waiting for your step by step tutorial here.
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Jun 7 2005, 12:16 AM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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i will. hope it will help many ppl who interested to built an opaamp and don't know how to start.
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Jun 7 2005, 12:24 AM
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Junior Member
183 posts Joined: May 2005
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 you talking about me here? lol.I cant even solder a wire to PCB properly.. how to build an amp for myself? hahaha. |
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Jun 7 2005, 12:43 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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here is a rough sketch of my amp's front panel:
 missing part including: 1) input and output indicator 2) volume level indicator 3) indicator on each knobs here is the raw casing:    it's gonna cost me RM150 to drill the inset and holes....then i most likely will have to deanodize the whole plate and reanodize it myself again gonna buy a battery charger to try it out soon. |
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Jun 7 2005, 01:08 AM
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Senior Member
8,046 posts Joined: Jan 2003
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PCWork, give you a tip!..clean off the solder flux residue with paint thinner, then the points would look bright & shiny!. use a chinese pen brush dipped in thinner then wash it off. Don't worry, it won't damage anything on the solder side.
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Jun 7 2005, 01:48 AM
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Junior Member
5 posts Joined: Jun 2005
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These might help a lilttle, ok it is not DIY but DIY kits!
http://www.decware.com http://www.bottlehead.com http://www.passdiy.com/ http://www.welbornelabs.com/ http://www.octave-electronics.com/ For the ultimate design, I wud take this anytime. http://www.electronluv.com/ This post has been edited by Techno_Gizmo: Jun 7 2005, 02:08 AM |
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Jun 7 2005, 01:53 AM
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Senior Member
975 posts Joined: Sep 2004 From: Setapak
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oo..can't wait until finish..pcwork..post some picture..k? i got diy headphone...but already rosak. (1 is cmoy..1 is base lm386)
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Jun 7 2005, 03:58 AM
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Junior Member
183 posts Joined: May 2005
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Alamaklor. I thought you only built headphones amp
 Walau.. 2 piece of speaker can fill up my room. But it's worth it laa.. I rather sacrifice my bed space for speakers |
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Jun 7 2005, 09:15 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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dont let the size fool you, it is a headphone amp.
im wondering if i should make things simple and forget about making inset, deanodizing and reanodizing it....very mar fann and also wondering if it is ok to leave all input and output at the rear |
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Jun 7 2005, 02:03 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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blackflam i guess they are doing acoustic test on the speaker, that's now how we normally listen to it. some more i don't think it will sound good since it is 1 way speaker. =P
bsl555 : TQ. it really help a lot. =P This post has been edited by PcWork: Jun 7 2005, 02:04 PM |
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Jun 7 2005, 02:24 PM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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Alamak, is your amp gonna have equalization?
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Jun 7 2005, 10:05 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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modD i don't think his dynalo got equalization from what i study. if he want some equalizer i think he will built another one with another casing. rather than having an equalizer built in an amp.
dynalo = first class (class A) headphone amp leh... =)~ |
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Jun 7 2005, 10:37 PM
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Junior Member
183 posts Joined: May 2005
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AlamakLor will build a pretty casing for his amp. But not for his naked PC.. lol. PaperBox casing
Of course, it is first class headphone amp. it definitely deserves it AlamakLor, If I order from you, issit almost same like this? Or portable ones like gavlim (in mint tin) |
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Jun 7 2005, 10:57 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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depent on what you order, if you order a "dynalo", just like the one he make for himself, it gona cost you more than RM 1K.
if you order a "cmoy" it will in mint tin, if you still like aluminium casing, you can ask him buy for you, cost around 11 USD. but surely the one aluminium look much more nicer. p/s : Dynalo & Cmoy = different class of amp. cmoy is just beginer grade of headphone amp which sound relatively not bad. but dynalo = class A headphone amp. and the casing he is showing here already cost RM 200++ This post has been edited by PcWork: Jun 7 2005, 10:58 PM |
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Jun 7 2005, 11:05 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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no integrated equalizer for this one. just that i'd make a gain switch to switch the amp into an active preamp.
QUOTE(blackflam @ Jun 7 2005, 11:37 AM) AlamakLor will build a pretty casing for his amp. But not for his naked PC.. lol. PaperBox casing i didnt design this amp, just assembled it. stuff that i make are all portable ones,a nd they all will be in extuded aluminium enclosure, actually much tougher than the one in the picture.Of course, it is first class headphone amp. it definitely deserves it AlamakLor, If I order from you, issit almost same like this? Or portable ones like gavlim (in mint tin) |
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Jun 8 2005, 10:11 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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hope to hear review of you soon alamaklor, for dynalo... hehehehe first review of dynalo in lyn...
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Jun 10 2005, 10:27 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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bump up this topic
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Jun 14 2005, 09:15 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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I have received several pms regarding the amps that i am building. Currently, I am working on a portable amp that would be used to power low impedance phones.
there would be a bass boost feature, variable volume or possibly fixed. reason for having bassboost is due to the there maybe or may not be a crossfeed feature on it (speaker emulation), as personally i dont like it and everything adds up to cost, which would then be transferred to the price.it would take in 2 X 9v (pretty typical in portable amp market), or if possible 12 X AAA (best with Ni-MH Rechargeables). personally i prefer the latter oh btw, may be......dc powered.the casing, is an extruded aluminium chassis, if u dont know what is extruded aluminium.....well basically the whole casing is in one piece without any seam, you can run a car over it and it will still be in perfect shape....minus the scratches you can also use the amp to slam other's ipod to pieces, yet still having a good shape in the end so you got the idea the price? it's not gonna be cheap anyone should be able to know that with some common sense these are going to be retail in the future. pics will be up when it is ready, no ETA as i usually cant make it haha |
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Jun 14 2005, 11:14 AM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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Alamak, just wanna ask. in case i need an opamp, can i get it through you?
right now i'm using Burr-Brown OPA2604AP dual opamp, and i'm in the process of transferring the whole amp onto a new circuit board and casing. i'm afraid i might have burnt the opamp while desoldering (i didnt use a socket). i can't test this yet coz my headphones have gone kaput. |
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Jun 14 2005, 11:19 AM
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Senior Member
3,813 posts Joined: Jan 2003
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Alamaklor..Where is the pictures? Can't wait to see ur Bulletproof Headamp casing!
How much u estimate the price of ur DIY amp? |
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Jun 14 2005, 12:03 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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yup, u can order the opamps from me, but i will only take note and make the order when i make my next order
picture? i just finished drawing the schematics earlier havent even bought the casing, so how can i show any pics? |
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Jun 14 2005, 12:10 PM
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Senior Member
3,813 posts Joined: Jan 2003
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Alamaklor,
is der any ppl use TUBE AMP for portable amp? maybe dig a hole inside the steel box to protect it from impact?! haha. i dunno. (i still waiting to test Pcwork headamp when he come to KL..haiyo u live too far away from us) Check this out guy.. How is this thing work? It is such a beauty to me!. http://www.e-dot.com/TubeAmpImages/TubeAmpE.jpg This post has been edited by dinodog_Jr: Jun 14 2005, 12:12 PM |
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Jun 14 2005, 12:12 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(dinodog_Jr @ Jun 14 2005, 01:10 AM) Alamaklor, um no.....tube amp needs lots of voltage, not possibly portable at all...at least cannot be battery powered is der any ppl use TUBE AMP for portable amp? maybe dig a hole inside the steel box to protect it from impact?! haha. i dunno. (i still waiting to test Pcwork headamp when he come to KL..haiyo u live too far away from us) its just temporary i live near oug in msia. |
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Jun 14 2005, 02:43 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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alamaklor, handphone batt can be use with the amp or nor?
if i wanna put the headamp to be charge via USB port is that possible? usb port only 5V only. do you have similar schematic for that purpose? |
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Jun 14 2005, 05:06 PM
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Senior Member
3,813 posts Joined: Jan 2003
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Yeah..This is goin to be even portable headamp & saving my fussy to bring along charger!
Input(poot) ...poot~ poot~ poot~ pls.. |
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Jun 14 2005, 09:01 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(PcWork @ Jun 14 2005, 03:43 AM) alamaklor, handphone batt can be use with the amp or nor? usb port is too noisy, forget about it if i wanna put the headamp to be charge via USB port is that possible? usb port only 5V only. do you have similar schematic for that purpose? |
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Jun 14 2005, 10:00 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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hehehe
just suggestion. if add some filter in ,then what left might be 2V? and you need to charge up 8 AAA battery.. hm.. maybe it take 48 hours?..... hehehehe This post has been edited by PcWork: Jun 14 2005, 10:04 PM |
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Jun 28 2005, 10:26 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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yay, my cmoy finaly sing~ and it sound sweet, bass is much more better.
but too bad my digi cam is with my GF. can't take picture recently. |
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Jun 29 2005, 02:52 AM
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Senior Member
975 posts Joined: Sep 2004 From: Setapak
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congratulation then...send some picture...ok?
This post has been edited by rioven: Jun 29 2005, 02:52 AM |
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Jun 29 2005, 05:24 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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i will, ,after i go back to UPM on 9th of july and get back my digi cam.
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Jul 1 2005, 02:36 PM
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Senior Member
3,813 posts Joined: Jan 2003
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wah..haf to wait so long ahhh...........
how many headamp u had made PC work? how is the batt life? update update pls~ |
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Jul 21 2005, 04:13 AM
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Senior Member
8,046 posts Joined: Jan 2003
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QUOTE(PcWork @ Jun 29 2005, 05:24 PM) i will, ,after i go back to UPM on 9th of july and get back my digi cam. Ahoy there!..you're supposed to show us some pics of your project?..what happened?, no sound from you?.. or it turned you deaf arrr?? |
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Jul 21 2005, 10:51 AM
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Senior Member
2,234 posts Joined: Jan 2003
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yo alamaklor u got the schematics for a good headphone amp?
im plannig to build one after getting my soundcard but i have no fkin idea on which is good.... output... etc |
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Jul 21 2005, 12:28 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(evo.com @ Jul 20 2005, 11:51 PM) yo alamaklor u got the schematics for a good headphone amp? www.headwize.com have a bunch.im plannig to build one after getting my soundcard but i have no fkin idea on which is good.... output... etc google for tangentsoft (audiologica) site and u may find pimeta, cmoy, mint, and ppa schems there. u can also get gilmore's schemes from headamp, or kevin gilmore's site directly. |
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Jul 21 2005, 01:52 PM
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Senior Member
2,234 posts Joined: Jan 2003
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cool
thx man |
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Jul 21 2005, 02:01 PM
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Senior Member
2,234 posts Joined: Jan 2003
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ugot the weby link to gilmours website?
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Jul 21 2005, 02:03 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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google is ur best friend. his site is a little crappy imho, headamp has hus schemes anyway
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Jul 21 2005, 02:15 PM
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Senior Member
2,234 posts Joined: Jan 2003
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i already googled with kevin gilmour.... only showed kevingilmour.com and forum threads...
and i dont think headamp.com has the schems... even after 15 mins of searching... also im looking for the prewired kevin boards.. got any clue on where to look for it? YES i know google is my friend.. but if you know it it'll only take u 20 secs most to post it and me 30 mins. thx |
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Jul 21 2005, 02:38 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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i jsut went to headamp and seems like they have removed all the schematics. they had each amp's schematics on the last part of the product describtion page.
unfortunately, gilmore's site is also down. i dont have his site in the rig i am using now, but i got this from head-fi: http://gilmore.chem.northwestern.edu/ u can get the dynalo and dynahi's schematics here: http://www.djgardner.com/headphone/gilmore/ prewired boards? i have an extra brand new dynalo board, if u want that, i can sell it to you. |
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Jul 21 2005, 03:04 PM
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Senior Member
2,234 posts Joined: Jan 2003
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sweet.. ill check the dynalo headphone amp
if its alright ill get it from you... reserve the xtra board for me pls thx |
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Jul 21 2005, 08:58 PM
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Junior Member
473 posts Joined: Jan 2003 From: CLAMP
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anyone selling DIY headphone amp?
PM me |
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Jul 21 2005, 09:03 PM
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Senior Member
8,046 posts Joined: Jan 2003
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QUOTE(sickboy @ Jul 21 2005, 08:58 PM) anyone selling DIY headphone amp? Why don't you PM the moderator?. He's wonderfully resourceful in this department!. PM me |
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Aug 10 2005, 10:05 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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my current project, after enough messing with CMOYs. moving on to a biased and buffered amp. trying this circuit in particular :
   Simple Class AB Headphone Amp, originated from Jeong Sheob Shin from headfi. found all of the parts needed today from HitechTron JB. costs a wee bit more than a CMOY, but i'm guessing it should sound better than a basic CMOY. though it's an upgrade from the original CMOY, it doesn't have it's root from CMOY, it's closer resembling the original biased Class B headamp from Mark Hennessey.  it's an improved Class B headamp from Jeong Sheob Shin first shown here.   i really can't say more before actually testing the unit on a breadboard, but since it's a biased headamp with a buffer, i'm really guessing it would sound better than a basic CMOY. now, if only i had more space in my enclosure.. my pewter box is really packed right now. |
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Aug 16 2005, 09:41 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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nobody updated this thread. guess nobody even reads this anymore..
oh well, posting my updates anyway for the sake of knowledge. my 1st Basic CMOY. no optimizations whatsoever, the plain CMOY from the original article.  my 2nd Basic CMOY. changed the 220uF power caps to a bigger 470uF, and did noticed some improvement in bass handling. the signal caps has also been changed to a 0.22uF film cap (as opposed to the default 0.1uF polyester). i also integrate a TREAD power regulation circuit to power the CMOY from AC/DC converter. reference to TREAD power circuit : Tangent Regulator, Adjustable, plus Diode bridge  ^ the big black heatsink covers the LM317 power regulator. but i noticed that it has low heat output, so decided to change the heatsink to a smaller one for my final CMOY. my 3rd Basic CMOY. built this amp supposedly for final headamp. i also built a Modified Linkwitz Crossfeeder since there's some space left in the pewter box to accomodate extra circuit. further tweaked the signal caps, tried some caps just to get the best sound. i tried around 12 different caps before resorting to a 0.47uF film cap which gave the best depth and bass composition compared to others. 470uF power caps used.   and right after that, stumbled on the Class AB headamp by sijosae in HeadWize forum. so decided to implant a new amplification circuit to replace the Basic CMOY. |
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Aug 16 2005, 10:01 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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my 4th headamp, the Class AB headamp by sijosae.
this circuit has no signal caps, and is a buffered, biased headamp. tried it on a breadboard, and it's way better than a basic CMOY, so a new transplant is needed. the pewter box is really cramped, so i had to further miniaturize the already small circuit. this is how it looks like :  the amplification circuit, successfully implanted :    and the pewter box after completing the project :   the final amp is wayyyyy better than all 3 CMOYs that i built before this, even beating the tweaked CMOY in my 3rd circuit. the bass is a lot more composed, and goes down much lower, and has a lot better transparency. how much transparent you say? this amp without Noise Sharpening beats my 3rd CMOY even with the Noise Sharpening plugin set at 90%. i needn't use any Noise Sharpening plugin anymore, and the DSP stack is now cleared from everything. i did test the new amp for bass response (just for fun) using foobar's internal tone generator, and my headphones successfully reaches all the way down to the 5Hz tone without any distortion. ^ well, good enough for me. currently eyeing the Multi-Hybrid HeadAmp that uses a single tube and MOSFET for amplification. might skip the PPA project and try the tubes first. |
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Aug 17 2005, 02:14 AM
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Senior Member
1,487 posts Joined: Oct 2004 
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thedoctor, just admiring the time and effort that must've gone into these projects! where did you source all the parts from?
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Aug 17 2005, 12:23 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(gavlim @ Aug 17 2005, 02:14 AM) thedoctor, just admiring the time and effort that must've gone into these projects! where did you source all the parts from? well, it takes about 2 weeks of my free time to get everything done. but for the sound that i'm getting, it's really worth it. the parts is from electronic shops around JB, since it's much cheaper compared to RS Components and Farnell.total cost for the whole Class AB amp + TREAD power regulation circuit + Modified Linkwitz Crossfeeder is about RM100-RM150. i think most of the cost goes into those 1% metal films resistors which i used a lot. even the LED resistor is a 4.7kOhm metal film.. ^ read somewhere that 1% metal films gave a much lower Total Harmonic Distortion compared to the normal resistor, so i'm only using metal films in my amp. |
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Aug 17 2005, 01:13 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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somebody asked, and i've written so much that i'm posting it here for everyone.
QUOTE actualy i am interest in building a Cmoy, and also the headphone amp.i am using the edifier HA11 headphone amp, but it's really sucks man, cant really make my philips HP895 sound nice also. do u have any idea where i can get all the part in malaysia?and one more thing, the Cmoy can use to push the earphone?or it's just for headphone?really need help...thank you... what soundcard do you use? i'm also using the HP-895, paired with an EMU0404. but i did tried the HP-895 with a CMOY on Audigy2 ZS, and the sound did have a significant improvement. i really can't say much on the HA11 since i've never tried it, but reading from gavlim experience before selling the HA11 that he owns, i do think that a CMOY is far better than the HA11. the HP-895 is a little bright, and the SoundManglers makes it worse by stressing too much on treble. CMOYs would fit in just nicely by trimming the extra high frequencies, and improving the depth/stereofield. i would recommend the Class AB headamp over CMOYs because of better definition, but only if you're not using Creative Audigy/Audigy2/Live since the Class AB has a much better transparency, and pairing the HP-895 + ClassAB to those Sound Manglers would make the high even worse. build a CMOY with a 470uF power caps and 0.47uF/1uF film caps if you think the HP-895 is too bright for your liking. but do try the Class AB if you think the details could be further improved, and if you're not using Sound Manglers. yes, i did built all the amps with parts from JB alone. i would get it from Farnell if should it's nearer since Farnell has a much wider choice, but as mikechai said, i'm too far south.. ^ and in case you're wondering, JB is in Malaysia.. as for the cans (the SHP-895), i do think it's good enough. if you think that cans is bad in any way, be rest assured that it's not the cans fault. it might be your source, your amp, your cables or your ear.. check all of them, one might be at fault. |
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Aug 20 2005, 08:52 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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yo.. you're the man~ thedoctor, admire for your effort you use to make the amp.
hope forward to see your own DIY bulb amp. |
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Aug 25 2005, 09:50 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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part list for basic Cmoy
2 x 220 µF 35V electrolytic capacitor (prefer branded, i use 470 µF for better bass, polar) 2 x 0.1 µF 50-plus volt full-size film cap* ( MAKE SURE IT IS NON- POLAR type) 3 x 10 KΩ 1/4W metal film resistor (GET 1% tolerance type don't use 5% one, or you might get unbalance sound.) 2 x 4.7 KΩ 1/4W metal film resistor(GET 1% tolerance type) 2 x 100 KΩ 1/4W metal film resistor(GET 1% tolerance type) 2 x 1 KΩ 1/4W metal film resistor (GET 1% tolerance type) 1 x Dual op-amp ( one chip, have amp for dual channel, i am using opa 2134, you can use opa 2132 too and many other op amp chip.as long as it is a dual op amp.) 1 x Power indicator LED ( normal LED will do, can change to super bright type) 2 x Stereo mini jack (3.5mm) 1 x stripe board 1 x DIP-8 IC socket (to hold the chip on the board, if you have nice skill on soldering, and willing to risk the amp burn out, you can skip this things) 1 x Enclosure ( i use Hudsons jujubes candy case) 1/2 x 9V battery clip (1 or 2 depent on how many battery you want to use, i use 1) 1 x Volume knob ( easier to control volume, found in jalan pasar) 1 x Volume control, Panasonic 10K, horizontal mount ( better quality one, and make sure it fits in your casing. |
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Aug 25 2005, 11:06 PM
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Junior Member
203 posts Joined: Jan 2003
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wow~!thanks for PcWork...how about the schematic for the Cmoy?i think we need more ppl like pcwork and thedoctor...who really willing to share what they noe...or mayb there are some other member sharing too...so dun angry if i nvr include the name...haha...
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Aug 26 2005, 06:23 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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QUOTE(PcWork @ Aug 25 2005, 09:50 PM) part list for basic Cmoy pcwork, from where u get the panasonic 10k dual pot? i cant find it in jalan pasar.2 x 220 µF 35V electrolytic capacitor (prefer branded, i use 470 µF for better bass, polar) 2 x 0.1 µF 50-plus volt full-size film cap* ( MAKE SURE IT IS NON- POLAR type) 3 x 10 KΩ 1/4W metal film resistor (GET 1% tolerance type don't use 5% one, or you might get unbalance sound.) 2 x 4.7 KΩ 1/4W metal film resistor(GET 1% tolerance type) 2 x 100 KΩ 1/4W metal film resistor(GET 1% tolerance type) 2 x 1 KΩ 1/4W metal film resistor (GET 1% tolerance type) 1 x Dual op-amp ( one chip, have amp for dual channel, i am using opa 2134, you can use opa 2132 too and many other op amp chip.as long as it is a dual op amp.) 1 x Power indicator LED ( normal LED will do, can change to super bright type) 2 x Stereo mini jack (3.5mm) 1 x stripe board 1 x DIP-8 IC socket (to hold the chip on the board, if you have nice skill on soldering, and willing to risk the amp burn out, you can skip this things) 1 x Enclosure ( i use Hudsons jujubes candy case) 1/2 x 9V battery clip (1 or 2 depent on how many battery you want to use, i use 1) 1 x Volume knob ( easier to control volume, found in jalan pasar) 1 x Volume control, Panasonic 10K, horizontal mount ( better quality one, and make sure it fits in your casing. thanls  |
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Aug 31 2005, 04:32 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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selling off my Head Amp in Garage Sales. refer here.
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Sep 1 2005, 02:32 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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The schematics used for my Class AB headamp.
[personal note] before going into this, you might wanna start with something simpler, something like the basic CMOY to get some proper experience with troubleshooting audio circuitry. [The Class AB amp circuit] *take note that the schematics is only for one channel, mirror both for both left and right channel. [The power regulation circuit] Tangent Regulator, Adjustable, plus Diode bridge. TREAD Schematics  TREAD Part List TREAD Benchmark Test [The Modified Linkwitz Crossfeeder]  the original article : An Acoustic Simulator for Headphone Amplifiers |
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Sep 2 2005, 12:36 AM
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Junior Member
491 posts Joined: Dec 2004 From: subang jaya
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why all also headphone wan ? nobody making streo amp ?
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Sep 2 2005, 12:49 AM
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Senior Member
1,113 posts Joined: Jan 2005 From: <Insert interesting place>
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QUOTE(wednesday @ Sep 2 2005, 12:36 AM) why all also headphone wan ? nobody making streo amp ? stereo amp, is a totally different thing, hardware wise, time wise, skill wise, etc....leave those things to the pros. |
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Sep 2 2005, 04:07 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(Xonius @ Sep 2 2005, 12:49 AM) stereo amp, is a totally different thing, hardware wise, time wise, skill wise, etc....leave those things to the pros. well actually, some of the headamps that's featured all over the net do have the output current enough to drive a pair of small bookshelfs. some examples are the Eaton amp and the Morgan Jones tube amps. |
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Sep 8 2005, 04:47 PM
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Senior Member
2,234 posts Joined: Jan 2003
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Just completed my CMoy headphone amp... i would like to thank chernloon especially for giving me the website and many thanks to mikechai for my wonderful e-mu0404 soundcard...
and also ionstorm for guiding this noob here at recording i used the opa2132 chip love this small little amp.... DIY makes it even more lovable |
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Sep 8 2005, 05:21 PM
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Senior Member
1,053 posts Joined: Nov 2004
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bro...got pics?
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Sep 8 2005, 05:26 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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ya..show some pics of ur baby
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Sep 8 2005, 05:28 PM
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Senior Member
2,234 posts Joined: Jan 2003
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Ill post 2moro...
 all A-OK... just need to drill the holes on my case |
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Sep 8 2005, 07:01 PM
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Senior Member
1,293 posts Joined: Jan 2003
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Congrats!
Now let it burn in then wait for your pics and reviews. Did you make your opamp swappable? |
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Sep 8 2005, 08:47 PM
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Senior Member
1,487 posts Joined: Oct 2004
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merged threads.. congrats on building your new amp
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Sep 8 2005, 09:11 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(evo.com @ Sep 8 2005, 04:47 PM) Just completed my CMoy headphone amp... i would like to thank chernloon especially for giving me the website and many thanks to mikechai for my wonderful e-mu0404 soundcard... what kind of casing that you're using? and any thoughts about building a more complex circuit?and also ionstorm for guiding this noob here at recording i used the opa2132 chip love this small little amp.... DIY makes it even more lovable M3 or PPA perhaps?  |
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Sep 9 2005, 07:59 PM
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Senior Member
2,234 posts Joined: Jan 2003
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hey guys ive got some problems while mounting the circuit and everytihng on the casing....
after installing everything the righ channel wont work when amp is switched on!!! but when its off the left channel works and the right is dead silent i check all the joints and stuff but still cant figure out teh problem... help plss... |
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Sep 9 2005, 08:55 PM
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Senior Member
2,234 posts Joined: Jan 2003
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 finally found out the source of the problem its the metal zinc casing... both of the sockets are connect directly guess ill have to buy a plastic casing... haizz more $$$ |
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Sep 9 2005, 09:04 PM
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Senior Member
975 posts Joined: Sep 2004 From: Setapak
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erm...put some pad under the circuit...
p/s: after looking ur amp 4 a while...just realize the pad..haha This post has been edited by rioven: Sep 9 2005, 09:06 PM |
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Sep 9 2005, 09:24 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(evo.com @ Sep 9 2005, 08:55 PM) finally found out the source of the problem i can't understand what you meant with this. the input/output sockets could be grounded together with the volume pots.its the metal zinc casing... both of the sockets are connect directly guess ill have to buy a plastic casing... haizz more $$$ if you take it out of the case, does it work? |
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Sep 10 2005, 05:44 AM
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Senior Member
2,234 posts Joined: Jan 2003
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it works when i take it out of the case
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Sep 10 2005, 01:30 PM
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Senior Member
8,046 posts Joined: Jan 2003
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QUOTE(evo.com @ Sep 9 2005, 08:55 PM) finally found out the source of the problem its the metal zinc casing... both of the sockets are connect directly guess ill have to buy a plastic casing... haizz more $$$ Bad quality chassis and grounding will contribute to high noise floor, unexplainable buzzes or hum and performance issues. Google around in DIY places and observe how others build their stuff and exercise care. |
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Sep 10 2005, 05:16 PM
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Senior Member
2,234 posts Joined: Jan 2003
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i dont get any noise or hums at any volumn... just that when i mount the sockets on the casing the signal passes right through
does that happen? the case that i used is made of zinc |
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Sep 10 2005, 06:19 PM
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Senior Member
2,234 posts Joined: Jan 2003
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just mounted the amp onto a new plastic case... works well now
overall lesson learnt: 1) use bigger pots with stronger lugs 2) plastic casing 3) smaller gauge wires had a real nice time assembling the amp... gonna build another 4 more with the remaining chips |
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Sep 11 2005, 10:15 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(evo.com @ Sep 10 2005, 06:19 PM) just mounted the amp onto a new plastic case... works well now if you have that much more chips, i suggest you take a look at some better designs such as PIMETA/MINT/PPA or even the M3. i've ditched my PPA project after reading that M3 sounds much better. and i already ordered most of the parts for that project. overall lesson learnt: 1) use bigger pots with stronger lugs 2) plastic casing 3) smaller gauge wires had a real nice time assembling the amp... gonna build another 4 more with the remaining chips |
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Sep 12 2005, 12:29 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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QUOTE(thedoctor @ Sep 11 2005, 10:15 PM) if you have that much more chips, i suggest you take a look at some better designs such as PIMETA/MINT/PPA or even the M3. i've ditched my PPA project after reading that M3 sounds much better. and i already ordered most of the parts for that project. do u order the M3 pcb board from the amb page? i think the components available through there is cheaper than getting it in msia, morever some not available here. however i not sure how bout the import tax. |
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Sep 12 2005, 03:50 AM
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Senior Member
2,234 posts Joined: Jan 2003
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QUOTE(thedoctor @ Sep 11 2005, 10:15 PM) if you have that much more chips, i suggest you take a look at some better designs such as PIMETA/MINT/PPA or even the M3. i've ditched my PPA project after reading that M3 sounds much better. and i already ordered most of the parts for that project. u got the schems fr tat? |
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Sep 12 2005, 01:08 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(chernloon @ Sep 12 2005, 12:29 AM) do u order the M3 pcb board from the amb page? i think the components available through there is cheaper than getting it in msia, morever some not available here. however i not sure how bout the import tax. nope, i just transferred the schematics onto the normal protoboard, futher miniturizing the original circuit (kindda like what sijosae did). i already did it for the PPA design (original design with full features), and now doing it for the M3. hopefully the final scematics would be completed by the end of this week. the components? it's definately cheaper here in Malaysia. in fact, Malaysia's pricing is even cheaper than Singapore, if you look hard enough. but some of those parts used are quite a hassle to find, but i managed to get sources for everything. QUOTE(evo.com @ Sep 12 2005, 03:50 AM) u got the schems fr tat? Amb's MMM page  |
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Sep 12 2005, 04:00 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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QUOTE(thedoctor @ Sep 12 2005, 01:08 PM) nope, i just transferred the schematics onto the normal protoboard, futher miniturizing the original circuit (kindda like what sijosae did). i already did it for the PPA design (original design with full features), and now doing it for the M3. i thought the components is cheaper through the amb site, after conversion. maybe because i compare the price with farnell, i din check at jalan pasar yet. quite difficult to get good components from there. mostly are not available, but those Wima cap is available at farnell, however, a good pot is difficult to find, and i finally manage to check out that rs malaysia (www.rsmalaysia.com) got the alps 50k pot, i think cost around rm14.hopefully the final scematics would be completed by the end of this week. the components? it's definately cheaper here in Malaysia. in fact, Malaysia's pricing is even cheaper than Singapore, if you look hard enough. but some of those parts used are quite a hassle to find, but i managed to get sources for everything. Amb's MMM page |
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Sep 12 2005, 05:54 PM
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Senior Member
975 posts Joined: Sep 2004 From: Setapak
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maybe u can find transistor at jalan pasar..TLE2426 n opamp is no way...have to buy from farnell or rsmalaysia
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Sep 12 2005, 06:00 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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or just forget about it and do a virtual ground
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Sep 13 2005, 02:43 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(AlamakLor @ Sep 12 2005, 06:00 PM) or just forget about it and do a virtual ground i've seen someone benchmarked the sijosae's Discreet Rail Splitter and got quite a good result when compared with TLE2426 over in headwize or head-fi (can't remember). |
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Sep 13 2005, 09:40 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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the thread that made me stop my PPA v2 project :
PPAv2 - M^3 Head-to-Head QUOTE On a somewhat unrelated note, Nate also brought along a Millet Hybrid prototype from the group buy. I have to say that at less than half the cost of the other amps, the Millet is a strong performer. It might not have the detail or speed of the solid state amps, but it offers a warmth and fullness of sound that the other amps can't touch. And the Millet paired with Nate's Grado 225's sounded great... they match extremely well. i can't get my hands on the tubes used by those Millet, but i'm eyeing the sijosae's Multi Hybrid Tube Amp and use a Discreet Diamond Buffer for the output stage. |
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Sep 16 2005, 08:02 PM
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Senior Member
936 posts Joined: Jun 2005
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Anyone know a shop where I can get OPA 2134 op-amps ?
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Sep 16 2005, 08:04 PM
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Senior Member
1,487 posts Joined: Oct 2004
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get someone to DIY for you..
got this from zungiu : LD3 will be available for OVERSEAS sale after 3 weeks time. The automatically intelligent adjustable impedance LD3 overseas price: 250 USD, shipping fee: 82.5 USD (weight: 6.8 KG). Insurance: 12.5 USD (optinal). LD3 will automatically adjust its internal parameters to match the impedance of your headphone for the best performance!! The ohm under speaker mode is fixed as 8 ohm You have several choices under headphone mode: 16,32,60,300,600ohm. The fixed impedance LD3 overseas price: 222.5 USD, shipping fee: 82.5 USD (weight: 6.8 KG). insurance of the 5 percent of the total value. Insurance: 11.2 USD (optinal) The ohm under speaker mode is fixed as 8 ohm However, you only have one choice under headphone mode: either 16,or, 32,or, 60,or, 300,or, 600ohm. You need to let us know which impedance you want to build for your LD3 when you make the order. Attached thumbnail(s) 
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Sep 17 2005, 08:32 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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QUOTE(sakaic @ Sep 16 2005, 08:02 PM) Anyone know a shop where I can get OPA 2134 op-amps ? u can get at farnell around rm11don think can find it at jln pasar however, i think using 2 opa134 will be better to avoid crosstalk but this will double your cost since it cost around rm10 each as well. |
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Sep 18 2005, 09:43 PM
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Elite
3,001 posts Joined: Jan 2003 From: KL, M'sia
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QUOTE(gavlim @ Sep 16 2005, 08:04 PM) get someone to DIY for you.. look very similar to Unison Research S2Kgot this from zungiu : LD3 will be available for OVERSEAS sale after 3 weeks time. The automatically intelligent adjustable impedance LD3 overseas price: 250 USD, shipping fee: 82.5 USD (weight: 6.8 KG). Insurance: 12.5 USD (optinal). LD3 will automatically adjust its internal parameters to match the impedance of your headphone for the best performance!! The ohm under speaker mode is fixed as 8 ohm You have several choices under headphone mode: 16,32,60,300,600ohm. The fixed impedance LD3 overseas price: 222.5 USD, shipping fee: 82.5 USD (weight: 6.8 KG). insurance of the 5 percent of the total value. Insurance: 11.2 USD (optinal) The ohm under speaker mode is fixed as 8 ohm However, you only have one choice under headphone mode: either 16,or, 32,or, 60,or, 300,or, 600ohm. You need to let us know which impedance you want to build for your LD3 when you make the order. http://www.unisonresearch.com/valvolari/image/S2K.jpg |
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Sep 18 2005, 11:28 PM
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Senior Member
3,593 posts Joined: Feb 2005 From: ***Penang***
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can i ask a noob questions ?
wat are these amp for ? |
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Sep 19 2005, 06:14 AM
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Senior Member
936 posts Joined: Jun 2005
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QUOTE(chernloon @ Sep 17 2005, 08:32 AM) u can get at farnell around rm11 Ok....how do you guys trade with Farnell. I tot its the same with RS where u need an account ?don think can find it at jln pasar however, i think using 2 opa134 will be better to avoid crosstalk but this will double your cost since it cost around rm10 each as well. Oh, and another thing. Why is it evertime I see a DIY amp its usually a tube amp ? Are tubes really superior in terms of sound quality ? All my DIY amps so far have been trans or op-amps. |
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Sep 19 2005, 09:17 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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you can actually go to farnell trade counter at jalan 51A/227 and get it by cash, no need account. however, if u r at outstation, i not sure bout it. maybe u can check at my.farnell.com
hope this help you |
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Sep 19 2005, 01:34 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(sakaic @ Sep 19 2005, 06:14 AM) Oh, and another thing. Why is it evertime I see a DIY amp its usually a tube amp ? Are tubes really superior in terms of sound quality ? All my DIY amps so far have been trans or op-amps. nope, tube is indeed inferior if you look at the specs. it introduces 2nd level harmonic distortions into the audio signal. but you get something very different from the normal amplification. PPAv2 - M^3 Head-to-Head ^ the above thread compares the PPA and the M3 and the Hybrid Millet. both the PPA and the M3 are OP-Amp based amps, utilizing the best design, biased into Class A etc etc etc. but the Millet is a Hybrid Tube amp, and read how it compares to both the best of the OP-Amp reign. |
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Sep 21 2005, 02:54 AM
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Senior Member
936 posts Joined: Jun 2005
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Thats the thing.......I thought the purpose of all this is accurate audio reproduction. How come loss of detail is ok ?
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Sep 21 2005, 03:31 AM
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Senior Member
2,687 posts Joined: Jan 2003 From: Sue Bunk Jai Yaa!
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i hope one day sumone can guide me in making my own portable amp...
anione care to conduct sumthing like 1 day course ka? ahahahah |
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Sep 21 2005, 04:20 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(junkieG @ Sep 20 2005, 04:31 PM) i hope one day sumone can guide me in making my own portable amp... start reading from 1st page......anione care to conduct sumthing like 1 day course ka? ahahahah |
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Sep 21 2005, 11:39 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(sakaic @ Sep 21 2005, 02:54 AM) Thats the thing.......I thought the purpose of all this is accurate audio reproduction. How come loss of detail is ok ? it's hard to put it into words, but a very transparent/revealing system would lead to a very 'unpleasant' experience if paired with a not so godly source. not all songs have good quality recordings/mixing and this would be projected with so much accuracy that it's kindda annoying. tube adds depth to the mids, improving the vocals, softening the highs and tightening the bass. it does naturally during pre-amplification stage, improving the whole sound experience. heck, i've never auditioned a tube setup before, and quite interested to see (i mean hear) how it scales up to IC/MOSFET/Transistor amps. Yeo (DIYParadise) still haven't replied me with my order on Ei Elite 6DJ8 tube. still waiting patiently.. |
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Sep 23 2005, 03:01 AM
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Senior Member
936 posts Joined: Jun 2005
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QUOTE(thedoctor @ Sep 21 2005, 11:39 AM) it's hard to put it into words, but a very transparent/revealing system would lead to a very 'unpleasant' experience if paired with a not so godly source. not all songs have good quality recordings/mixing and this would be projected with so much accuracy that it's kindda annoying. Asked him about some stuff as well and no reply from him too tube adds depth to the mids, improving the vocals, softening the highs and tightening the bass. it does naturally during pre-amplification stage, improving the whole sound experience. heck, i've never auditioned a tube setup before, and quite interested to see (i mean hear) how it scales up to IC/MOSFET/Transistor amps. Yeo (DIYParadise) still haven't replied me with my order on Ei Elite 6DJ8 tube. still waiting patiently..  but anyway, I've heard a tube set only once. It was at LYP gnd floor. They were selling a stage 1 amp with a pair of bookshelves for 799. It did sound different but since it was using their stuff I rally couldn't tell the difference. But nowadays, I find constructing my own amp difficult cos 1st of all, I stay in Melaka so its ard to get stuff from Farnell. Next is I come here, ask for a LM3886 and then when I get the thing I'm not sure if its the real thing. Sometimes a bit on the cheap side. 1% resistors are really hard to find here and the worst thing I get the usual 'aiyah same one.... ' reaction when I ask for something a bit exotic like log potentiometers. Kinda hard to DIY here. Currently building a LM3886 based amp capable of Bi-amping. Just finished the PCB design and looking out for any tiny flaws on the design before I fab the board. Needed the OPA2134s for filtering the bass. Anybody got extras ? |
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Sep 28 2005, 10:18 PM
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Junior Member
453 posts Joined: Jan 2003
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My M3 amp.
The heatsink, these are quite hot in our weather even at the default 80mA bias.  Panasonic FC, wima FKP2, BC 370, OPA627/637 combo. I kinda prefer this over the AD8610 as they produce a bigger soundstage but the AD8610 has a more punchy bass.  Overall view.  The el-cheapo mild steel casing from jalan pasar cost me RM24.  And finally paired with my grado 225.  Here is the BOM list (borrowed from n maher (head-fi forum) that i use for M3 parts. 
Farnell_M3_bom.zip ( 7.33k )
Number of downloads: 58This post has been edited by TerTop: Sep 28 2005, 10:49 PM |
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Sep 29 2005, 12:34 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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^ woot! you beat me to building the M3 amp. calculated, the parts are quite expensive to get a full working amp (at least for me).
how much did it cost? rough estimate. |
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Oct 11 2005, 10:01 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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this thread needs a BUMP!
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Oct 11 2005, 10:23 PM
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Junior Member
453 posts Joined: Jan 2003
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QUOTE(thedoctor @ Sep 29 2005, 12:34 AM) ^ woot! you beat me to building the M3 amp. calculated, the parts are quite expensive to get a full working amp (at least for me). Haha sorry i missed your post. All in including STEPS, accessories,etc comes to about rm800-850 (not including the hourly manpower charge, sweat and the frustation if something goes wrong). If you are not solder friendly, you can always get those builders to do it for you in a sexy aluminium enclosure. eg. Rockhopper - rm1400 + shipping how much did it cost? rough estimate. .http://www.elvencraft.com/mmm/ |
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Oct 12 2005, 12:16 AM
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Senior Member
945 posts Joined: Mar 2005
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Maybe LYN should have a headfier gathering at least we can heard what other people have.
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Oct 12 2005, 12:45 AM
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Junior Member
279 posts Joined: Jan 2003
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QUOTE(TerTop @ Oct 11 2005, 10:23 PM) Haha sorry i missed your post. All in including STEPS, accessories,etc comes to about rm800-850 (not including the hourly manpower charge, sweat and the frustation if something goes wrong). If you are not solder friendly, you can always get those builders to do it for you in a sexy aluminium enclosure. eg. Rockhopper - rm1400 + shipping I havent been posting anything for quite some time now... anyway since you gat a really nice setup there Tertop ... I just had to drop in to congratulate you for you nice M3 and also everyone else who's been building , designing and experimenting a lot in this hobby especially thedoctor and a few others which shows how much this place has progressed in terms of this hobby..http://www.elvencraft.com/mmm/ ....maybe we could all do a mini meet someday. I could bring over my PPA which I had built ... I posted some pics in Lowyat sometime a go but I guess it was lost due to lack of interest Afterall someone elses amp was getting more attention at that time since then I have upgraded some stuffs eg glassman buffers etc etc ... but since I got no camera's or any latest pics ... I'll just reuse the old pics and post it once again     Eventough the amp internals is a little bit different compared to the pics....nothing much have changed .. and ... I still cant say that I've finished the amp fully 100% since I havent drilled the power switch propely and some small stuffs here and there... but since It's already quite usable and listenable I've been listening to it since. Hahah to lazy to finish it up plus my job is killing me right now since I've been really busy these couple of months and I got barely no time to spend on this hobby I've only been focusing on another project of mine in my spare time which is building some passives for my peerless mids and vifa tweets for my ICE setup. I still have some spare buffers and a STEP board left from the ppa project which I dont think I'll be using anymore. Anyone interested..hehe |
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Oct 12 2005, 01:58 AM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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second that idea of meeting up, then can test n see the difference of amps, headphones..really can give ppl the 'upgraditis'..hehe! COOL Enclosure, so pro-looking
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Oct 12 2005, 05:12 PM
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Junior Member
453 posts Joined: Jan 2003
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Woah Escaflowne you got a really nice ppa there especially the diamond buffer. Heard alot nice thing about them too. I'm very iching want to give it a listen haha. Is that a elna tonerex or pana fc? Why is it different from the rest of cerafine?
Where is Escaflowne staying? I support the idea of mini meet, maybe someone could bring along their x-can. I've been very curious about the tube sound myself since i've never heard one myself. Now i've been considering to build a guzzler dac. Anybody interested? |
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Oct 12 2005, 05:14 PM
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Junior Member
453 posts Joined: Jan 2003
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Eh forgot to ask you Escaflowne, your grado pad is it the original bowl version or you mod it with other bowl?
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Oct 12 2005, 07:37 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(TerTop @ Oct 11 2005, 10:23 PM) Haha sorry i missed your post. All in including STEPS, accessories,etc comes to about rm800-850 (not including the hourly manpower charge, sweat and the frustation if something goes wrong). If you are not solder friendly, you can always get those builders to do it for you in a sexy aluminium enclosure. eg. Rockhopper - rm1400 + shipping .http://www.elvencraft.com/mmm/ more or less what i calculated.. |
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Oct 13 2005, 09:55 AM
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Junior Member
279 posts Joined: Jan 2003
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QUOTE(TerTop @ Oct 12 2005, 05:12 PM) Woah Escaflowne you got a really nice ppa there especially the diamond buffer. Heard alot nice thing about them too. I'm very iching want to give it a listen haha. Is that a elna tonerex or pana fc? Why is it different from the rest of cerafine? Yup I deffinately heard a difference when moving up to the diamond buffers. Err how do I explain this .. one noticable diff is I noticed that the sound of the instuments to be potrayed more realistically with more body to it.Do you mean the black colour cap ? Ooo those are black gate fk's I got there . Compare the size of 35v cerafines and a 25v black gate Just had to put one in there since I had a test on something else back then and noticably heard a diff wiff the black gates  even tough I'm not sure if it did bring any benefits in this setup since never had a test with this application, just the tought of knowing it's there makes me sleep more peacefully at night QUOTE(TerTop @ Oct 12 2005, 05:12 PM) Where is Escaflowne staying? I support the idea of mini meet, maybe someone could bring along their x-can. I've been very curious about the tube sound myself since i've never heard one myself. Haha I know uncle Bsl555 got himself an X-can . A few other forumers life fusion also has it. btw I'm staying in Bangi . I'm always in for a mini meet provided at the time I'm free. |
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Oct 13 2005, 06:34 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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blackgate..the mystic caps that is hard to come by even in the west..are there out of production ka?
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Oct 13 2005, 07:10 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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yes, they have already been discontinued.
UPS just brought me 6 more opamps from AD 2 X ad797, 2 X AD743 and 2 X 8610 (broke a null pin on mine when soldering it to a dip socket....doesn't look that nice, so requested replacement ) |
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Oct 13 2005, 09:05 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(AlamakLor @ Oct 13 2005, 07:10 PM) yes, they have already been discontinued. UPS just brought me 6 more opamps from AD 2 X ad797, 2 X AD743 and 2 X 8610 (broke a null pin on mine when soldering it to a dip socket....doesn't look that nice, so requested replacement )wah lau.. lots of it! care to send some of it over here after playing? you wouldn't have any unused AD8620/AD843 lying over somewhere in your drawer now would you? |
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Oct 13 2005, 09:08 PM
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Senior Member
3,910 posts Joined: Jun 2005 From: Andy @ London.com Status: N/A
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anyone can teach me do a small AMP just for phone ?
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Oct 13 2005, 09:32 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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phone as in handphone, telephone or headphone? the two first one use the ubiquitous uA741 oso can do
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Oct 14 2005, 03:19 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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forget about the 741, it's a piece of sh1t when it comes to audio circuit.
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Oct 14 2005, 05:19 AM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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but handphone/telephone is only limited in bandwidth, so no problem there ma..hehe!
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Oct 14 2005, 05:55 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(ijan @ Oct 13 2005, 06:19 PM) but handphone/telephone is only limited in bandwidth, so no problem there ma..hehe! oh wait, I didn't read the post properly, I thought u said something about 741 as audio amplifier it's like using any NTE XXXX. |
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Oct 15 2005, 02:17 PM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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i'm currently in the process of moving my CMOY amp into a new casing.
well, not new actually... being a cheapskate, i decided to reuse an old external modem case for the amp.  the top post is the volume post which i will attach a black brushed aluminium knob later.  this is the rear part of the casing. i plan to have 2 inputs, one for the normal 3/4" minijack, and one for seperate right and left RCA jacks. the RCA sockets will be placed on the empty area on the left. on the righ, you can see the tops of the power supply capacitors. i purposely make it visible like that to look like american hot rod cars where the engines protrude from the hood hehehe  this is the PCB. i suck at planning circuits, so this is what i ended up with. actually, it's only halfway finished. i paused this project a few months ago and right now i forgot a lot of things about the circuit. it seemed like i have to start over with a new board... sigh... maybe it'll take a while till i have enough time to continue this... anyway, i plan to spraypaint the whole casing. the Aztech Modem wroting kinda seem lame |
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Oct 15 2005, 10:12 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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good for you..i scoured butterworth and cant find a shop with decent OpAmp..not even 1% resistor..that is from like 10 shops with 3 of them being 2 shoplot big..
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Oct 15 2005, 10:56 PM
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Senior Member
8,046 posts Joined: Jan 2003
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QUOTE(ijan @ Oct 15 2005, 10:12 PM) good for you..i scoured butterworth and cant find a shop with decent OpAmp..not even 1% resistor..that is from like 10 shops with 3 of them being 2 shoplot big.. KL sure got wan!..1% metal film resistors one-eighth or quarter watt type.2 shops I know, Nixie Electronics, opposite Pudu Plaza KL & Mobicon in Taman Medan off Old Klang Rd.(Mobicon sell 10pcs each value minimum for resistors) perhaps u PM some DIYers here to help you get them but u pay shipping of course lah. This post has been edited by bsl555: Oct 15 2005, 10:57 PM |
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Oct 15 2005, 11:09 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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ehehe..penang dude, not in kl..but theDoctor can find all the things he need from a local store in Johor n thats neat! Buyingo nline requires sum account creaition , company, faxing bla bla..really hassle
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Oct 15 2005, 11:39 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(ijan @ Oct 15 2005, 11:09 PM) ehehe..penang dude, not in kl..but theDoctor can find all the things he need from a local store in Johor n thats neat! Buyingo nline requires sum account creaition , company, faxing bla bla..really hassle not all of it. 1% metal films are easy to find over here, together with some high quality pots (Panasonic i think, but PCB mount). as for Op-Amps, TL-07X are the only Op-Amp available, selling around RM3 per piece. i did glimpsed something that have an 'ALPS Japan' wording, rated at 50kOhm dual pot, useable for panel mount. have to take a closer look though. for higher quality components, online is the only way. i got my ALPS RK097 pots after a week of waiting from RS, Op-Amps after 2 weeks. |
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Oct 15 2005, 11:40 PM
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Senior Member
8,046 posts Joined: Jan 2003
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QUOTE(ijan @ Oct 15 2005, 11:09 PM) ehehe..penang dude, not in kl..but theDoctor can find all the things he need from a local store in Johor n thats neat! Buyingo nline requires sum account creaition , company, faxing bla bla..really hassle Of course I know you're in Penang..point is..folks here could assist you if you can't find the right stuff.Doc can also go across the causeway..more items & choice there.. hehehe..unless u start picking the trash bins of Intel, AMD, Texas, NS..etc.. |
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Oct 16 2005, 12:31 AM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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as i thought..registered on RS anf Farnell, hoping that they offer at least credit card payment..no option, only counter pickup, klang valley cod or corporate account..
anybody has experince making a personal purchase over at rs/farnell before? im trying my best not to go through my lab to porcure those items as they are humunculously slow.. This post has been edited by ijan: Oct 16 2005, 01:12 AM |
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Oct 16 2005, 05:52 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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i did make purchase at farnell for many times since its near my uni. sometime quite disappointed because at the farnell msia website there mention that the component is in stock but when i go there, they said out of stock and need to wait shipment from sg.
and need to pay another visit to collect itstudent can have 5% discount at the trade counter if u bring along ur student card |
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Oct 16 2005, 10:42 AM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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waseh..any other way to make purchase at farnell? credit card perhaps..can help to buy ka..hehe! but farnell oso only have 2134..im looking for 2227
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Oct 16 2005, 10:44 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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i bought 2227 from farnell, but wait for shipment from sg, take around within 1 week time. if u wan u just pm me, can help u buy if i go there
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Oct 16 2005, 04:15 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(chernloon @ Oct 16 2005, 10:44 AM) i bought 2227 from farnell, but wait for shipment from sg, take around within 1 week time. if u wan u just pm me, can help u buy if i go there chernloon, any news about your project? some pics would be nice.. |
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Oct 16 2005, 04:24 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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the dr,
just halfway through with the sijosae class ab, progress really slow due to waitin for component and updating some parts and now just order for the alps 097 dual pot audio tapper from rs, waitin for them will post up some pics when finished assembling |
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Oct 16 2005, 05:26 PM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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For those are who are lazy making their own headphone amp.
You may join the bulk, RM222 only. http://forum.lowyat.net/index.php?showtopi...7&#entry5073527 |
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Oct 17 2005, 11:24 AM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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QUOTE(DAViS @ Oct 16 2005, 05:26 PM) For those are who are lazy making their own headphone amp. damn... i could use one...You may join the bulk, RM222 only. http://forum.lowyat.net/index.php?showtopi...7&#entry5073527 but no money now, double damn... |
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Oct 17 2005, 11:35 AM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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QUOTE(modD @ Oct 17 2005, 11:24 AM) damn... i could use one... No need damn-lah, do you have PayPal? Just use your PayPal pay it-loh, but no money now, double damn... Come on guys... I need to get this stuff as soon as possible. Come join the bulk. Thank you. |
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Oct 17 2005, 01:19 PM
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Senior Member
945 posts Joined: Mar 2005
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It's a good portable amp with no audible floor noise and gary is very helpful. Highly recommend for entry level.
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Oct 26 2005, 06:30 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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a new hybrid tube design. the creator of the Cavalli-Jones (runeight) even says that it comes close if not better than the original Cavalli-Jones amp.
the Cavalli-Jones-Pasculle (SOHA) thread. implementing a proper tube design with no output caps, requiring a small film caps before the output stage. a small 0.1uF polypropylene should be enough compared to the 470uF electrolytic caps that the original MHHA/YAHA required. the schematic is kindda easy, while capable of powering a wide range of cans (from low to high resistance). using only an easy to find 30V transformer. i'll be receiving my 6DJ8 tube tomorrow. guess you guys till see an update in the next few days. i'll start by breadboarding the MHHA and YAHA with maxed out configuration and trying out the inverted cathode plate iHybrid version of it, together with a proper diamond buffer output stage. as for the SOHA, give it some more time, it'll eventually evolve into something better since it's still in experimental stage. watch out for this. should be a killer amp for the price. i'm guessing it'll be even better than the Morgan-Jones that still requires the electrolytic output cap. the Morgan-Jones is raved about as being a fun amp to listen to compared to even a high-end M3 and PPA. and if should you need to compare this to the X-Can, do know that even the X-Can have caps in its signal path. i have the schematics of the X-Can to prove it. the X-Can uses a different topology altogether, with the tube as an output stage. at least with a DIY amp, i could mess around with the configurations and optimize the circuit according to my liking. guess will build myself 2 cases for both the maxed YAHA/MHHA variant and the SOHA variant this Raya holiday. this new design is really drawing my attention. |
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Oct 26 2005, 06:36 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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^ 53V AC voltage. should give you a good electrocution nonetheless, but far less from the higher 300V that you normally find in other tube designs.
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Oct 30 2005, 01:39 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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update.. update..
the Yet-Another-Hybrid-Amplifier (YAHA)     still in burn-in process before having a critical listening test. the amp is quite good even as it is. still in partial-maxed out configs with Pana FCs and Muse FGs. using the simplest design (Grounded Cathode) from sijosae and fa-schimdt and i tested both the design, with little or no difference between them. will tweak the design further before finalizing the amp. right now it's using a variable resistor without a Constant Current Source (CCS) and it's quite susceptible to power noise. the furthest apart circuit is the TREAD power regulation curcuit. without this, the amp hums. for now i'm letting this whole thing burned-in before messing again with the design. i'm guessing a Discreet Diamond Buffer, CSS plate current and a 24V-30V power supply upgrade next week. right now it's built with an Op-Amp output stage in voltage follower configuration. weak if you ask me. the Diamond Buffer will be using the same design as the one used in the Millett Hybrid upgrade and PPAv2 (with a little change). think i'll skip the Class AB buffer for this one and go straight into Class A. it's been a habit of mine to build an amp on a breadboard first, and tweak the circuit to my preference before finalizing it and with this particular project, tweaking is a must since it needs some changes to compliment different cans' resistance. and not to mention the different bias settings that's needed for different tubes. the tube is an Ei-Elite Gold Pin 6DJ8EG from diyparadise. you could use any 6922/PCC88/EC88C but the 6DJ8 is the best bet in regard to Amperex 6DJ8 (too pricey) or Philips JAN6922 (too artificial). it needs some changes to the design since it needs current for the serial heater (in regard to paralel voltage heater in 6922/ECC88/PCC88) and the current is a bit higher at 365mA (than 300mA for 6922). the sound? if a buffered amp (like the Sijosae Class AB) could be considered as a level up from the CMOY, then this would be a level up from that amp. the sound is in no way the same. the bass is more refined, the sound is warmer with better detail and better 'air' to it. even with no burn-in, i'm having this face after moving from the Class AB to this..i would jump straight to the Cavalli-Lovell-Pasculle if it weren't because i've acquired all of the part for this. the Cavalli-Lovell-Pasculle (SOHA) is released just a few days back. but to think, do try this 1st before trying higher voltage tube amp to get proper experience. at least i did some wiring error to mine, but hey, this is my 1st tube amp. |
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Oct 30 2005, 08:17 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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so i can't wait. patience is not one of my virtues anyway.
- upgraded to 30V DC adapter, regulated to 24V using TREAD. - removed the variable resistor, upgraded to the Constant Current Source version using 2SK30A JFETs, output fixed to 0.5mA - removed the Grounded Cathode topology, moved to fixed biasing with 16.8V of bias for the plate voltage. - added some 100uF Muse FG parallel to the cathode resistor. - added some 0.47uF polyester caps near the Op-Amp. - bypassed the 1000uF Muse FG also with some 0.47uF polyester (though i have 1uF polypropylene but that takes a whole lot of space. will use them on the final circuit though). and with 24V, the tubes gets a bright orange glow, much brighter than when i'm using 12V. and gets pretty hot too! in fact both the tubes and the two voltage regulators got very hot with 24V, i can't put my hand on it for more than 4 seconds. heatsinked both the voltage regulator and double checked the tube current and confirmed it's sucking 350mA. guess those tubee are meant to be hot aren't they?      ah, beautiful.. it would be even brighter if i'm illuminating the tube with super bright blue LED in the final version. one more upgrade to do, which is the Diamond Buffer. |
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Oct 30 2005, 08:26 AM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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Nice job.
I hate those test board plug in damn ugly. If somebody able find the *cough* copy of Protel PCB CAD design software for me, I might able help out to design better board and mass produce to you guys. Good things must share-share-mah, Conditions provided I am free-lah, |
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Oct 30 2005, 08:38 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(DAViS @ Oct 30 2005, 08:26 AM) Nice job. I hate those test board plug in damn ugly. If somebody able find the *cough* copy of Protel PCB CAD design software for me, I might able help out to design better board and mass produce to you guys. Good things must share-share-mah, Conditions provided I am free-lah, the breadboard would only be used temporarily for optimization purposes. i could plug in anything and test for sonic improvement if there's any. anyway, about the PCB, would you be able to make a multilayer PCB with those tools? that would keep things super tidy for a DIY amp. |
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Oct 30 2005, 08:52 AM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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QUOTE(thedoctor @ Oct 30 2005, 08:38 AM) the breadboard would only be used temporarily for optimization purposes. i could plug in anything and test for sonic improvement if there's any. Not making-lah, but drawing only. I did drew up to 6 layers (excluded silk screen top and bottom anyway, about the PCB, would you be able to make a multilayer PCB with those tools? that would keep things super tidy for a DIY amp. ) for Philips MMS series... long story.Those who mastering in AutoCad also can help out those mechanical drawing but I am not good with this software. |
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Nov 1 2005, 02:21 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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update..
upgraded to the Diamond Buffer. and it was sure difficult as hell. used all of the available space on the breadboard, with some major problems at the beginning. well, you know, the usual stuffs : oscillation, unstable operation, DC offset, low gain, etc etc etc. can't blame me though, this is the first time someone ported the PPAv2 Diamond Buffer for the YAHA amp. but nonetheless, i got it working and here are some pics of it. had to remove the heatsinks since most of the board are used. and tweaked all of the configurations available. the amp is now neither a YAHA nor a PPA nor a Millet Hybrid.    maxed out all the available tweaks, and finalized the circuit. i'm gonna transfer this to a veroboard and encase it. |
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Nov 1 2005, 01:18 PM
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Senior Member
2,864 posts Joined: Jan 2005
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Wow, nice work. thedoctor, are you going to consider offering an amp building service for the DIY-cacat bunch? (for instance, myself
) |
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Nov 1 2005, 01:30 PM
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Senior Member
945 posts Joined: Mar 2005
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please bring along your amp for next gathering.
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Nov 5 2005, 01:55 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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[update]
i like to think that i've maxed out my setup, especially the SBC HP-895 performance. seems like it had reached its maximum potential since moving from one upgrade to another does very little improvement to the sound. in example from the OpAmp to the Diamond Buffer would lead to minor improvement when i should be hearing bigger improvements. or maybe i put my expectations too high for a RM200 cans. guess it's time for an upgrade.. QUOTE(Tachikoma @ Nov 1 2005, 01:18 PM) Wow, nice work. thedoctor, are you going to consider offering an amp building service for the DIY-cacat bunch? (for instance, myself )currently? nope.. not that many people would appreciate DIY stuffs and the only ones that do, are the ones that does DIY in the 1st place. the thing is, most of my builds are tweaked for my particular setup, in regard to my ears and it might taste differently on other people setups. QUOTE(airbag_grado @ Nov 1 2005, 01:30 PM) please bring along your amp for next gathering. i would if i could make it. but KL is far away land, and i'm too far south. would really be interesting to see how this compares to TerTop's M3 or a PPA since it's maxed out in every possible way. the amp are now closer resembling a maxed out Millet Hybrid compared to the original YAHA design. |
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Nov 5 2005, 07:15 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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I am doing the sijosae class ab amp (circuit posted by thedoctor) and face the problem of short circuit between the +v and -v when the power supply is turned on. after some troubleshooting, finally found out its due to the current mirror / buffer stage after the opamp. the two transistors connected to the output of the opamp acted as diodes and together with the 2k resistors, they are to turn on the 2 transistors connected to the output. I think the 2k resistor is small enough to resultin higher diode current and diode voltage, and thus start to forward bias the 2 transistors at output, causing collector current to flow even with no input signal.
this is how class ab differ from class b. however, does this mean both output transistors are always turned on and thus cause direct short circuit from +v to -v? reducing the diode current will however only turn on the output transistors when there is input signal, which move the amp into class b, but will introduce more serious crossover distortion. i tried to run simulation on multisim and everything works fine, but in reality, sometime it short circuit but sometime it doesn. any sifu can help on this? |
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Nov 5 2005, 08:15 AM
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Senior Member
563 posts Joined: Jan 2003
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anyone know where can i get this in malaysia ?
http://www.radioshack.com/product/index.js...rentPage=search not sure where to post this, so post here, maybe u DIY guys know where take a look at this http://www.usbmicro.com/odn/documents/ACC4...5FDFF29EA1.html |
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Nov 5 2005, 07:08 PM
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Senior Member
6,489 posts Joined: Mar 2005 From: Serdang
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thedoctor : so many flying wires won't affect the sound quality? sorry never built it before, just curious.
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Nov 5 2005, 09:34 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(blah1134 @ Nov 5 2005, 08:15 AM) anyone know where can i get this in malaysia ? http://www.radioshack.com/product/index.js...rentPage=search not sure where to post this, so post here, maybe u DIY guys know where take a look at this http://www.usbmicro.com/odn/documents/ACC4...5FDFF29EA1.html never seen it before, never seen anyone uses one, and never read that anyone sells it anywhere. it looks cool, but i prefer the old fashioned soldering iron with a tip. this product would be useable for SMD components only. QUOTE(PcWork @ Nov 5 2005, 07:08 PM) thedoctor : so many flying wires won't affect the sound quality? sorry never built it before, just curious. i have no idea. would affect if the wires is close to a power rail, but this is a prototype build anyway. and tubes are never precise. it's not an accurate amplificator to begin with, non-linearities is a usual. heck, the channel gain is not even accurate in the 1st place, so you get an unbalanced sounds. i'm gonna build a proper circuit for it, with less wires all over the place. with a decent case of course. and about the unbalanced part above, that's where the tweaking start. you could tweak the cathode resistance, the plate voltage, the plate current and get a well matched tube even with unmatched pairs by tweaking the gain. my amp is tweaked to get nearly perfect match between channels by tweaking the plate voltage. tried and tested with a multimeter to perfection! |
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Nov 8 2005, 09:08 PM
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Senior Member
2,864 posts Joined: Jan 2005
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Here's something interesting for the DIY bunch...
[edit: ah stupid link, just search stax DA-80 on ebay.com] Do you think you guys can build a finished amp with this board? Its a stax DA-80 amp PC board, a mono amp design. How much will it cost to buy the rest of the components to finish this amp? This post has been edited by Tachikoma: Nov 9 2005, 08:05 PM |
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Nov 9 2005, 01:40 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(Tachikoma @ Nov 8 2005, 09:08 PM) Here's something interesting for the DIY bunch... http://cgi.ebay.com/Stax-Driver-Boards-for...1QQcmdZViewItem Do you think you guys can build a finished amp with this board? the link is not working. can't take a look to tell. |
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Nov 9 2005, 01:47 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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u hav to go to ebay and search for the stax driver boards, then only can access
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Nov 11 2005, 09:20 AM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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arghhhh my Cmoy doesn't work anymore! only a deep hum left... and no way to test which components failed. i tink it's the Burr-Brown OPA2604AP dual opamp...
biatchhhhhhh! |
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Nov 11 2005, 11:10 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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u can use alligator clip attach to ur headphone jack ( right or left) and test from the input of the cmoy till the output
since both side no sound most probably be the opamp, or the audio socket there or the power supply good luck |
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Nov 11 2005, 12:17 PM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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if an opamp fails, will it produce any sound at all? because in my case, there is still sound from the source which is a cd player, but it's VERY faint and flat. on top of the faint music, there's a deep hum on one side.
i'm trying to be optimistic and hope that the opamp is still working, and the fault lies on the other components or just my horrible circuit design. |
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Nov 11 2005, 01:48 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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b4 that does it work? i did a mistake b4, the non-invertin and invertin pin i connected terbalik, in the end get very faint audio with humming. after correct this, everything goes fine
u test 1 by 1, if u use the coupling cap, use ur headphone clipped to alligator clip n touch at the cap, if got sound, then the other components which u might connect b4 enter the opamp,if everything fine but don get the sound at the opamp output, then might b something wrong with ur opamp or any short circuit at power line etc editted : u can use a cheap opamp like lm358 etc as substitute to the opa2604 to check if its opamp prob or other components This post has been edited by chernloon: Nov 11 2005, 01:50 PM |
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Nov 11 2005, 01:53 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(modD @ Nov 11 2005, 12:17 PM) if an opamp fails, will it produce any sound at all? because in my case, there is still sound from the source which is a cd player, but it's VERY faint and flat. on top of the faint music, there's a deep hum on one side. i'm trying to be optimistic and hope that the opamp is still working, and the fault lies on the other components or just my horrible circuit design. be wary that huge DC offset could lead to hums. do check your output for DC offset before plugging your beloved headphones into it. it might fry your cans if the offset if too high. |
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Nov 12 2005, 01:12 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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[update]
blown my AC-DC 30V adapter while transferring the circuit to a veroboard because of wrong wiring. messed out the polarity at the TREAD board, and i swear i see the 10uF tantalum caps glows red before the diode protection smokes my transformer. now, i have a reason to build me a better power supply with 30V AC-AC transformer and max-out the voltage to 32V DC that i can't do before this. bah, another holdup. but on the bright side, i could then increase the plate voltage to about 24-26V and get better sound since there's a bigger overhead in the operating voltage. [conclusion] check, double check and triple check the polarity before plugging in your power supply to the amp. something might end up in smoke. |
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Nov 16 2005, 06:41 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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haha
new noob here jz wanna ask hw much minimum budget to DIY headphone amp ??? |
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Nov 16 2005, 08:05 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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depend on the quality
if get those cheap components, below rm30 u can do 1 |
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Nov 16 2005, 09:22 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(chernloon @ Nov 16 2005, 08:05 PM) depend on the quality so where can buy the component?if get those cheap components, below rm30 u can do 1 if the budget is between RM100 the quality is ok?? hw much u diy ur self? |
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Nov 16 2005, 09:48 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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jln pasar is the suitable place for local-made components where else the better 1 hav to get from farnell in pj (my.farnell.com) or rs malaysia at shah alam (www.rsmalaysia.com). rs does do COD around klang valley with extra charge of rm8.
rm100 is more than enuff for a basic cmoy amp. |
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Nov 16 2005, 10:32 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(chernloon @ Nov 16 2005, 09:48 PM) jln pasar is the suitable place for local-made components where else the better 1 hav to get from farnell in pj (my.farnell.com) or rs malaysia at shah alam (www.rsmalaysia.com). rs does do COD around klang valley with extra charge of rm8. thank for ur inform100 is more than enuff for a basic cmoy amp. i will gonna to diy 1 for myself if got any i dun understand , i will ask u guyz.. actually wat mean of cmoy?? |
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Nov 16 2005, 10:36 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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cmoy actually stands for Chu Moy , a guy who did a portable headphone amp using the basic non-inverting amp. tat's all.
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Nov 16 2005, 10:50 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(chernloon @ Nov 16 2005, 10:36 PM) cmoy actually stands for Chu Moy , a guy who did a portable headphone amp using the basic non-inverting amp. tat's all. CHU MOY???chinese??? |
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Nov 17 2005, 11:55 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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YAHA on Steroids
finally cased the whole thing and here's some pic of it. the original circuit is optimized here and there to maximize the design. the case is some cheap plastic casing that i bought for RM10. the original case looks awful and boring so i undercoated it and sprayed it black a few times to get that glossy finish.  the original diamond buffer on breadboard is too big to fit onto such a small space. transferred it onto a veroboard while miniturizing the circuit wherever i can. the original breadboarded diamond buffer: the succesfully transferred diamond buffer:   [the circuit could be further miniturized, but i left some space since the components does get pretty hot with 30mA of biasing into Class A] the amp, unpowered:  the backside:  2 sets of RCA jacks, one set for input and another set for output (for pre-amp purpose) which can be switched at the front knob for either the front or rear output. |
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Nov 17 2005, 11:56 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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the amp, powered:
   the amp, in lowlight condition:   things left to do: gonna wire the front 4 status LED since i skip that part while building the amp. the sound? i have no idea how it sounds like to you. i like it, but you might not. people did say that tubes compliment high impedence phones better than lower impedence since tube drives the output with voltage swing rather than current. but how about a Discreet Diamond Buffer voltage follower output stage with about 40mA of biasing current into Class A to bump that low output current issue? i really have no idea how this compares to other amps since i don't have anything worthy of comparison. to the buffered Class-AB? no competition whatsoever in anything. well, the Class-AB might have better efficiency though. this tube amp does amp sucks more than 500mA of current in operation compares to about 24mA on the Class-AB. did i mention that the Class-AB is also utilizing a Diamond Buffer for output stage? |
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Nov 17 2005, 12:01 PM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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Looks good. Not bad.
What is your cost to build the amp? |
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Nov 17 2005, 12:05 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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nicejob, thedoctor
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Nov 17 2005, 12:55 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(DAViS @ Nov 17 2005, 12:01 PM) Looks good. Not bad. What is your cost to build the amp? i could give the complete parts breakout, but all in all, i think it floats around RM200-RM250. rough estimate : the caseworks, knobs, jacks : RM70 the tube (Ei Elite Gold Pin 6DJ8) + gold plated ceramic tube socket : RM75 the diamond buffer (for 2 channels) : RM35 misc items (solder lead, board, LEDs) : RM10 DC power supply : free (from a printer) and it's mostly using high quality parts. Nichicon Muse FineGold, Panasonic FCs, EPCOS Polypropylene caps, ALPS Blue pots. i already have another set of transformers and extra case to build a better power supply for it. that costs RM50. a cheap 24V/30V DC power supply could also be used since the amp has a built in TREAD power board in it, with a CCS design (even sturdier against power supply ripples). but since i'm thinking of maxing the amp, i need about 40V of power, and a self designed power supply could give me a max rating of about 1.0A of power. a 42V/1.0A transformer would give enough headroom for 32V/0.5A of current drain. QUOTE(chernloon @ Nov 17 2005, 12:05 PM) nicejob, thedoctor thanks. |
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Nov 17 2005, 01:01 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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BTW chernloon,
i'm gonna draw a complete schematic for the design. it's NOT gonna be simple though. i'll post it here once it's done. [edited: left out the red word] This post has been edited by thedoctor: Nov 17 2005, 01:38 PM |
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Nov 17 2005, 01:03 PM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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Not bad for the price. Do you able built two to quad tube amps for the headphone?
Like left channel with a tube, right channel with the another? If can I believe kirlcheah can help you on this since he is free and he got experience in PCB-CAD drawing but we need to help him on making the PCB board too. |
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Nov 17 2005, 01:24 PM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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nice, doc!
a bit of labelling here n there and you can open a custom amp shop btw can i just go to farnell/RS and pick up stuffs? or do i have to be a registered company to buy things from them? i'm looking into rebuilding my CMOY amp from scratch and i wanna get a Burr-Brown opamp, which i'm not sure i can get from Jln Pasar. |
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Nov 17 2005, 01:36 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(DAViS @ Nov 17 2005, 01:03 PM) Not bad for the price. Do you able built two to quad tube amps for the headphone? Like left channel with a tube, right channel with the another? if you dive more into tube design, you'll know that using double, or quad tubes is a VERY simple thing to do. just parallel the heater and plate, and separate the grid and you're good to go. but you'll have only one improvement from using a dual tube on a double triode, which is better channel separation. but then you'd have to bypass one of the triode in the tube since the voltage swing then could be too high (too much gain). or use pentode/single triode instead (EL81 for instance). for normal operations, you don't need that much voltage swing since it's only driving headphones (and low impedence cans are drived by current not by voltage), so i've skipped on using dual tubes. the tubes is used only to add flavor to the sound and some gain to it, while the actual drive is done by the diamond buffer. i'm only using Philips SBC HP-895 32ohm cans, and only thinking of an upgrade to the SBC HP-1000 (another 32ohm cans), and the current by the diamond buffer would be more than enough to drive the HP-1000. if you're pairing it with high impedence phones, only then would you need a fully tube drive that could swing the voltage higher. and another thing, yeo (DIYParadise) does have the NOS Mullard 12AU7 which is kindda known for its sweet sounding characteristics (might be one of the best). i'm thinking of another amp that's gonna use that tube.. QUOTE(DAViS @ Nov 17 2005, 01:03 PM) If can I believe kirlcheah can help you on this since he is free and he got experience in PCB-CAD drawing but we need to help him on making the PCB board too. erm, i'm never fascinated by the idea of using printed PCBs on a tube design since it sucks too much current and it has a nature to burn PCB traces with the heat. that's why most people use point-to-point soldering using bare wires in a tube amp. manual bridge using solder is better than using PCB. and yes, some of the component does get mighty hot (current limiting resistors use in conjuction with the LM317 voltage regulator for instance). |
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Nov 17 2005, 01:50 PM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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I can lend you my HP-1000 for testing and I believe two tube amp does better job. If can why not you just built those stereo hi-fi amp? I would like to get one too...
Nope... I believe you never saw a PCB that can cope up to 845volts, which I drew it for Astec Penang. As long as the trace is big enough and the angle is smooth, you won't have much trouble. |
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Nov 17 2005, 04:18 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(DAViS @ Nov 17 2005, 01:50 PM) I can lend you my HP-1000 for testing and I believe two tube amp does better job. If can why not you just built those stereo hi-fi amp? I would like to get one too... lend it to me? i really can't accept your offer. i'm in Johor, and shipping back and forth might do damage to the unit. i really don't trust PosLaju or any other courier service to handle such delicate things. i would however consider upgrading to the HP-1000 in the near future if i could find the money. seems that i waste too much on amps and source rather than on the phones itself. er, i might add, the amp IS a stereo amp. but might not be HiFi enough for some though (since it's cheap). HiFi things costs like RM20k and RM200 things sounds like sh1t (to some). the tube used in the amp is a DUAL triode, meaning it has 2 separate triodes in it which does independent amplification for the 2 channels. separating the channels between separate tubes only improves the gain, voltage swing and channel separation. if a single tube could be used to amplify both of the channels separately, why use 2 tubes? some popular tube that falls under dual triode category include 12AX7, 12AU7, 6922, 6DJ8, 7DJ8, 5687, and some other types. and most tube amp that has odd numbered of tubes (say 1/3/5/7) usually uses a single tube for 1st stage to amplify both channels (Morgan Jones/Cavalli Jones/Cavalli Lovell/Cavalli Lovell Pasculle) and the rest for 2nd/3rd stage. i have no reason to use 2 tubes, so i skip on it. i don't need high gain and i don't need high voltage swing. i put a lot of thought on it before deciding to use a single tube. but yeah, two tubes might be better, but then i need to double the power supply current, and lower the gain manually. a single triode already have a gain of about 20-25. imagine doubling that figure. |
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Nov 17 2005, 04:21 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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wah..doctor
it is really very attractive leh...nice look |
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Nov 17 2005, 04:34 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(yeah_guyz @ Nov 17 2005, 04:21 PM) wah..doctor it is really very attractive leh...nice look thanks. i think white would look better though. gonna paint the case white for my next amp. yeah, i'm already thinking of something better already. i really gotta stop building amps and get me a better headphone. |
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Nov 17 2005, 05:07 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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modD :
till now i cant find BB opamp from jln pasar. u can just go to the farnell walk-in counter and get from there. no need registration. however, most of the opamp is not stocked at here. have to wait a few working days t b delivered from sg, then they will inform u to pickup |
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Nov 17 2005, 05:42 PM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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Huhu, I have learned alot from da doctor. Hmmm... what do you think about SoundStage amp that Tong Lee selling?
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Nov 17 2005, 06:07 PM
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Senior Member
3,593 posts Joined: Feb 2005 From: ***Penang***
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QUOTE(thedoctor @ Nov 17 2005, 04:34 PM) thanks. i think white would look better though. gonna paint the case white for my next amp. yeah, i'm already thinking of something better already. i really gotta stop building amps and get me a better headphone. got any amp to sell me ?? cheap one will doi just want to control the volume of my headphone |
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Nov 17 2005, 06:14 PM
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Senior Member
677 posts Joined: May 2005 From: 1s and 0s
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QUOTE(LittleLinnet @ Nov 17 2005, 06:07 PM) got any amp to sell me ?? cheap one will do You should have joined the Pocket Amp 2 V2 bulk by Davis earlier.. i just want to control the volume of my headphone  |
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Nov 17 2005, 06:32 PM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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Yeah Littlelinnet. Wanna join the bulk?
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Nov 17 2005, 06:55 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(Categg @ Nov 17 2005, 06:14 PM) You should have joined the Pocket Amp 2 V2 bulk by Davis earlier.. RM200++ is not exactly what i would call cheap. i could give a few reasons why the PA2V2 could be considered as an 'overkill'. but that would get me flamed, so think i just let you guys be. try browsing the DIY discussion on HeadWize rather than reading reviews on Head-Fi, and you will stumble upon something very similar to the design used in the Pocket Amp, and some senior members opinion on it. |
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Nov 17 2005, 07:09 PM
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Senior Member
3,593 posts Joined: Feb 2005 From: ***Penang***
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QUOTE(Categg @ Nov 17 2005, 06:14 PM) You should have joined the Pocket Amp 2 V2 bulk by Davis earlier.. QUOTE(DAViS @ Nov 17 2005, 06:32 PM) Yeah Littlelinnet. Wanna join the bulk? QUOTE(thedoctor @ Nov 17 2005, 06:55 PM) RM200++ is not exactly what i would call cheap. i could give a few reasons why the PA2V2 could be considered as an 'overkill'. but that would get me flamed, so think i just let you guys be. Oh well, RM200++ is really not cheap for me try browsing the DIY discussion on HeadWize rather than reading reviews on Head-Fi, and you will stumble upon something very similar to the design used in the Pocket Amp, and some senior members opinion on it. I got consider that, but i no money already..... And since my priority is want to control the volume only, and not to boost the performance sky high.... |
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Nov 17 2005, 07:42 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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want to control volume?
get audio jacks and potentiometer is enuff...haha put in a very small casing and there is ur volume control case |
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Nov 17 2005, 08:01 PM
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Senior Member
677 posts Joined: May 2005 From: 1s and 0s
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QUOTE(thedoctor @ Nov 17 2005, 06:55 PM) RM200++ is not exactly what i would call cheap. i could give a few reasons why the PA2V2 could be considered as an 'overkill'. but that would get me flamed, so think i just let you guys be. Hmm.. can drop some guidelines where to read ar? try browsing the DIY discussion on HeadWize rather than reading reviews on Head-Fi, and you will stumble upon something very similar to the design used in the Pocket Amp, and some senior members opinion on it.  |
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Nov 17 2005, 08:04 PM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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QUOTE(thedoctor @ Nov 17 2005, 06:55 PM) RM200++ is not exactly what i would call cheap. i could give a few reasons why the PA2V2 could be considered as an 'overkill'. but that would get me flamed, so think i just let you guys be. Hey, I need to know too how "overkill" it is. Put up your opinions please or your general compiled impressions. Thank you. try browsing the DIY discussion on HeadWize rather than reading reviews on Head-Fi, and you will stumble upon something very similar to the design used in the Pocket Amp, and some senior members opinion on it. |
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Nov 17 2005, 09:40 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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for those that have the PA2V2, care to take a pic of the circuit please? if i'm not wrong, it uses 2XAA battery right? and also could you guys tell me what chip the PA2V2 uses for amplification? the wording on the chip would be helpful.
for now, you might wanna read this : http://www.tangentsoft.net/audio/opamp-wv.html |
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Nov 17 2005, 09:45 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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its ad4xxx
forgot the whole number, but can run at 3V saw it at the pa2v2 page too bad no photo on circuit being shown |
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Nov 17 2005, 10:08 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(chernloon @ Nov 17 2005, 09:45 PM) its ad4xxx forgot the whole number, but can run at 3V saw it at the pa2v2 page too bad no photo on circuit being shown AD45084? is the circuit buffered? what type of Op-Amp used? a CMOS Op-Amp? i really think it's a CMOS Op-Amp since none of the normal FET/bipolar counterparts could be driven with such a low voltage. if it's in fact a CMOS Op-Amp, you guys might wanna read this thread : http://headwize.com/ubb/showpage.php?fnum=...00&srch=pocket; ^ an interesting discussion on CMOS Op-Amps that have large output current. and i might highlight this post so that you guys won't miss it accidentally : QUOTE(rickcr42) So far my experience has been CMOS OpAmps have a way to go before they can compete head-to-head in the sonics but rule in the current out vs. current draw and noise level departments. do try to understand tangent's article on op-amp voltage swing and the HeadWize thread. |
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Nov 21 2005, 01:39 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(thedoctor @ Aug 16 2005, 10:01 PM) my 4th headamp, the Class AB headamp by sijosae. doctorhw much it cost u to make this?? |
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Nov 21 2005, 02:25 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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i've lost count. should be somewhere around RM150 since it has a built-in TREAD board, and a Linkwitz Crossfeeder. just testing for the performance of hardware crossfeeder since some says it's better than software crossfeeder.
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Nov 21 2005, 06:27 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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QUOTE(thedoctor @ Nov 17 2005, 06:55 PM) RM200++ is not exactly what i would call cheap. i could give a few reasons why the PA2V2 could be considered as an 'overkill'. but that would get me flamed, so think i just let you guys be. try browsing the DIY discussion on HeadWize rather than reading reviews on Head-Fi, and you will stumble upon something very similar to the design used in the Pocket Amp, and some senior members opinion on it. same here..later burnt to crisp..QUOTE(yeah_guyz @ Nov 21 2005, 01:39 AM) doctor I finally got my component for a basic CMoy+Simpson crossfeeder and it cost sumwhere rm50++ Note there is no pot yet in mine, n it doensn haf a tread, but it has sumthing elese hw much it cost u to make this??  Maybe will finish mine is 2-3 weeks time. A nice quality audio taper cost rm15 to start RM50 to boost.. Chernloon almost finish his |
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Nov 21 2005, 06:32 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(ijan @ Nov 21 2005, 06:27 PM) same here..later burnt to crisp..I finally got my component for a basic CMoy+Simpson crossfeeder and it cost sumwhere rm50++ Note there is no pot yet in mine, n it doensn haf a tread, but it has sumthing elese Maybe will finish mine is 2-3 weeks time. A nice quality audio taper cost rm15 to start RM50 to boost.. Chernloon almost finish his hw bout the quality oh? RM50++ wuh so cheap |
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Nov 21 2005, 09:54 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(yeah_guyz @ Nov 21 2005, 06:32 PM) post som pic to see see ;a hw bout the quality oh? RM50++ wuh so cheap it's cheap all right. so cheap it would send tears running your eyes once you plug it in. factor in a decent pot, caseworks, DC power and it goes higher. but hey, once you got the CMOY to work, try the Class AB with the Diamond Buffer. that would be a step up from the cmoy. some even compares the buffer to BUF634 chip and find that the diamond buffer smokes the BUF. |
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Nov 21 2005, 10:14 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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the diamond buffer addon totally outperform the cmoy
a class above |
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Nov 21 2005, 10:15 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(thedoctor @ Nov 21 2005, 09:54 PM) it's cheap all right. so cheap it would send tears running your eyes once you plug it in. i m planning to build 1 cmoy for the coming day factor in a decent pot, caseworks, DC power and it goes higher. but hey, once you got the CMOY to work, try the Class AB with the Diamond Buffer. that would be a step up from the cmoy. some even compares the buffer to BUF634 chip and find that the diamond buffer smokes the BUF. budget RM100 is it ok for the quality? i m noob some guide line for me to look forward the component and the scheme?? |
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Nov 21 2005, 11:58 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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some stupid question to ask u guyz
normally wat type of battery using for the cmoy?? AAA or AA?? hw long the battery can last for?/ is it drains crazy??? |
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Nov 22 2005, 12:19 AM
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Senior Member
3,593 posts Joined: Feb 2005 From: ***Penang***
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QUOTE(thedoctor @ Nov 21 2005, 02:25 PM) i've lost count. should be somewhere around RM150 since it has a built-in TREAD board, and a Linkwitz Crossfeeder. just testing for the performance of hardware crossfeeder since some says it's better than software crossfeeder. hey, make me one cheap one please ? |
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Nov 22 2005, 12:21 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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the normal opamps used in cmoy runs at +/- 4.5V minimum. You'd need at least a 9V battery to power it. Additionally, when driving a high imp phone, you may hear some clipping
anyway, u can always run it at 18V or more.You can use AA rechargeables to power it, but to have an average voltage output of 9V, you'd need at least 7 rechargeable AA batteries (1.25 X 7 = 8.75V). That's some serious weight there. RM100 is more than enough for the parts if you are not fussy with the enclosure and already have the basic equipments for the project. |
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Nov 22 2005, 12:59 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(LittleLinnet @ Nov 22 2005, 12:19 AM) hey, make me one cheap one please ? i oso 1,badget between RM100 can design some scheme and list out the component available in malaysia i plan to learn hw to diy my self......... can? Professor thedoctor and alamaklor |
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Nov 22 2005, 01:14 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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im not a professor
jsut check google tangentsoft for the schematics. all you need: 1) 10 resistors (if no load resistors) 12 resistors (with load/current limiting resistors) 2) 1 X audio pot 3) 2 X electrolyte caps (1000uf/470uf) - if you are using only 1 X 9V battery, 10V caps would be fine; if you are gonna use 2 X 9V, get 25V caps. 4) 1 X dual channel opamp (save cost and hassles) 5) 2 X 3.5mm jack (panel mount/pcb) totally up to you. 6) optional 2 X 1uF and/or 0.1uF MLCC caps (same voltage rating as the electrolyte) 7) optional DC jack if you intend to use wallwart (AC->DC psu) to power it. this is a gawd damn basic cmoy. I had thought of selling cmoy kits.....but wonder if I should really do that |
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Nov 22 2005, 01:39 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(AlamakLor @ Nov 22 2005, 01:14 AM) im not a professor haha..dun b too humility jsut check google tangentsoft for the schematics. all you need: 1) 10 resistors (if no load resistors) 12 resistors (with load/current limiting resistors) 2) 1 X audio pot 3) 2 X electrolyte caps (1000uf/470uf) - if you are using only 1 X 9V battery, 10V caps would be fine; if you are gonna use 2 X 9V, get 25V caps. 4) 1 X dual channel opamp (save cost and hassles) 5) 2 X 3.5mm jack (panel mount/pcb) totally up to you. 6) optional 2 X 1uF and/or 0.1uF MLCC caps (same voltage rating as the electrolyte) 7) optional DC jack if you intend to use wallwart (AC->DC psu) to power it. this is a gawd damn basic cmoy. I had thought of selling cmoy kits.....but wonder if I should really do that u r oso 1 of the pro at here (ops satay satay )PA2V2 Headphone amp that at davis bulk..... is it oso cmoy?? y it is using the aa battery d? |
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Nov 22 2005, 01:46 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(yeah_guyz @ Nov 21 2005, 02:39 PM) haha..dun b too humility I've never seen the circuit, usually I'd just rule out amps that use ultra low operating voltage. Wanna buy amp? I'm selling one in the garage now u r oso 1 of the pro at here (ops satay satay )PA2V2 Headphone amp that at davis bulk..... is it oso cmoy?? y it is using the aa battery d? asking for US$340. I seriously doubt that I could fetch anybody in LYN who'd buy it though. |
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Nov 22 2005, 01:56 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(AlamakLor @ Nov 22 2005, 01:46 AM) I've never seen the circuit, usually I'd just rule out amps that use ultra low operating voltage. Wanna buy amp? I'm selling one in the garage now wah......US$340 asking for US$340. I seriously doubt that I could fetch anybody in LYN who'd buy it though.i dun hv that much of money gv me the link i wan go to seesee cant buy but can bump for u |
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Nov 22 2005, 01:58 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(AlamakLor @ Nov 22 2005, 01:46 AM) I've never seen the circuit, usually I'd just rule out amps that use ultra low operating voltage. Wanna buy amp? I'm selling one in the garage now y no1 post out the circuit d? asking for US$340. I seriously doubt that I could fetch anybody in LYN who'd buy it though.if som1 post out u can make it urself right? |
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Nov 22 2005, 02:02 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(yeah_guyz @ Nov 21 2005, 02:58 PM) y no1 post out the circuit d? unlike cooking, any people with above average electronics knowledge would be able to recrete the same thing as long as you have the recipe. At least for something like simple headphone amps like these.if som1 post out u can make it urself right? lazy to get the link, it's in garage sale nvm: here's the link hehe http://forum.lowyat.net/index.php?showtopic=221374 This post has been edited by AlamakLor: Nov 22 2005, 02:04 AM |
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Nov 22 2005, 02:06 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(AlamakLor @ Nov 22 2005, 02:02 AM) unlike cooking, any people with above average electronics knowledge would be able to recrete the same thing as long as you have the recipe. At least for something like simple headphone amps like these. are u refering this??lazy to get the link, it's in garage sale nvm: here's the link hehe http://forum.lowyat.net/index.php?showtopic=221374 u diy urself? or second hand? so hw much in ringgit malaysia RM900-RM1000? http://forum.lowyat.net/index.php?showtopi...3&#entry5343033 |
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Nov 22 2005, 02:08 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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time to go for my bed
hehe see ya............ thank you for teaching |
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Nov 22 2005, 02:10 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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diy? does it look "any bit" like DIY?
I oso found an interesting post in head-fi: QUOTE(bbdollar) Alright, this forum has convinced me that I absolutely need an amp to add to my portable set-up. Narrowed it down to two in my price range; a CMOY mint-tin amp (would buy one off Head-Fi), or a PA2V2. Which amp is your preference, and why? I know I'm already leaning towards the PA2V2 because it takes AA's, but I've heard that a CMOY will sound much better[U]. LMAO This post has been edited by AlamakLor: Nov 22 2005, 02:10 AM |
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Nov 22 2005, 06:34 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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lettin off ur sr-71? gona get what amp next?
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Nov 22 2005, 08:11 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(chernloon @ Nov 21 2005, 07:34 PM) lettin off ur sr-71? gona get what amp next? my own amp |
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Nov 22 2005, 08:17 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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ur DIY dynalO?
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Nov 22 2005, 08:48 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(chernloon @ Nov 21 2005, 09:17 PM) ur DIY dynalO? nope, my own amp. Amp that I designed and would fabricate myself. It'd be on sale after some time. Not sure if I'm gonna finish the dynalo, I might just sell off whatever that is completed later. |
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Nov 22 2005, 11:50 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(AlamakLor @ Nov 22 2005, 08:48 AM) nope, my own amp. Amp that I designed and would fabricate myself. It'd be on sale after some time. Not sure if I'm gonna finish the dynalo, I might just sell off whatever that is completed later. mind telling which type u're thinking? Tube? MOSFET? Op-Amp? Transistor? or a hybrid variant of those type? |
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Nov 22 2005, 11:59 AM
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Senior Member
945 posts Joined: Mar 2005
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DIY amp is it just for those know electrical, for lot of people (like me) not even can make sense out of the schemantic. Any guide for dummy?
This post has been edited by airbag_grado: Nov 22 2005, 12:05 PM |
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Nov 22 2005, 12:01 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(thedoctor @ Nov 22 2005, 12:50 AM) mind telling which type u're thinking? Tube? MOSFET? Op-Amp? Transistor? it's pure solid state, which specific kind is confidential. In case people start asking for schematics or a hybrid variant of those type? don't bother, that's my property EDIT: oh btw, I'd be placing order for the opamps from ti and analog this week. It should reach me by next week. This post has been edited by AlamakLor: Nov 22 2005, 12:09 PM |
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Nov 22 2005, 12:03 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(airbag_grado @ Nov 22 2005, 12:59 AM) DIY amp is it just for those know electrical, for lot of people (like me) not event can make sense out of the semantic. Any guide for dummy? DIY kits is a good starting point, the problem however, is that not many ppl make kits. I can always buy a bunch of components and make kits for popular amps like Pimeta, cmoy, and etc....but I have doubts in doing this...for some reasons |
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Nov 22 2005, 12:35 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(AlamakLor @ Nov 22 2005, 12:01 PM) it's pure solid state, which specific kind is confidential. In case people start asking for schematics don't bother, that's my property EDIT: oh btw, I'd be placing order for the opamps from ti and analog this week. It should reach me by next week. no interest in tubes? hybrid tubes gets you the best out of both world. high voltage swing from the tubes (good for high impedence phones), and high current from the output stage (good for low impedence phones). the sound is quite different from solid state amps, better if you ask me. |
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Nov 22 2005, 01:49 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(thedoctor @ Nov 22 2005, 01:35 AM) no interest in tubes? hybrid tubes gets you the best out of both world. high voltage swing from the tubes (good for high impedence phones), and high current from the output stage (good for low impedence phones). a composite amplifier can be designed with more than just tube + SS the sound is quite different from solid state amps, better if you ask me. I know what I am doing btw. |
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Nov 22 2005, 03:05 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(AlamakLor @ Nov 22 2005, 01:49 PM) a composite amplifier can be designed with more than just tube + SS I know what I am doing btw.hope to see some good results from you! nothing beats a self designed amp where you could tweak and customize the design to suit one's particular taste. don't forget to post the pics ya. even i can't design my own amp, just did a mere optimization/customization to readily available designs. all hail AlamakLor!  |
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Nov 22 2005, 04:44 PM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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QUOTE(yeah_guyz @ Nov 21 2005, 10:15 PM) i m planning to build 1 cmoy for the coming day the schematic: budget RM100 is it ok for the quality? i m noob some guide line for me to look forward the component and the scheme?? http://www.headwize.com/projects/showproj....e=cmoy2_prj.htm for the opamp chip, go to www.rsmalaysia.com and search for OPA134PA. the manufacturer is Texas Instruments. for the other components, not hard to find in normal electronic shops... |
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Nov 22 2005, 06:57 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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QUOTE(thedoctor @ Nov 21 2005, 09:54 PM) it's cheap all right. so cheap it would send tears running your eyes once you plug it in. yup yup..u would see them in red, haha! well, im getting slack of from taper part though, but trying to not shit the other basic..later on add on rk47, n buffers like u guys bising bising factor in a decent pot, caseworks, DC power and it goes higher. but hey, once you got the CMOY to work, try the Class AB with the Diamond Buffer. that would be a step up from the cmoy. some even compares the buffer to BUF634 chip and find that the diamond buffer smokes the BUF. QUOTE(AlamakLor @ Nov 22 2005, 02:10 AM) diy? does it look "any bit" like DIY? HEHE! that one is so funnnny.. I oso found an interesting post in head-fi: LMAO  |
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Nov 22 2005, 07:35 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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QUOTE(modD @ Nov 22 2005, 04:44 PM) the schematic: i think price at farnell is cheaper. can check it at my.farnell.comhttp://www.headwize.com/projects/showproj....e=cmoy2_prj.htm for the opamp chip, go to www.rsmalaysia.com and search for OPA134PA. the manufacturer is Texas Instruments. for the other components, not hard to find in normal electronic shops... alternative opamp is the OPA227PA |
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Nov 22 2005, 07:38 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(modD @ Nov 22 2005, 04:44 PM) the schematic: http://www.headwize.com/projects/showproj....e=cmoy2_prj.htm for the opamp chip, go to www.rsmalaysia.com and search for OPA134PA. the manufacturer is Texas Instruments. for the other components, not hard to find in normal electronic shops... QUOTE(chernloon @ Nov 22 2005, 07:35 PM) i think price at farnell is cheaper. can check it at my.farnell.com thank guyz! alternative opamp is the OPA227PA is it online buying? OPA227PA and OPA134PA same price? which 1 better? |
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Nov 22 2005, 08:21 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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QUOTE(yeah_guyz @ Nov 22 2005, 07:38 PM) thank guyz! which 1 is better, u can read from here : is it online buying? OPA227PA and OPA134PA same price? which 1 better? http://www.tangentsoft.net/audio/opamps.html farnell doesn provide online buying. u can go to the trade counter there, but normally opamp isnt stocked at here, hav to wait for shipment from sg which take around 5-7 working days. RS do provide COD in klang valley with extra charge of rm8. i not sure bout RS price, but farnell, both cost almost the same, almost rm11. but if u wana save, u can get OPA2134, which comprise of 2 opamp in single IC at rm10.xx only, while OPA2227 will b slightly expensive at rm17, i guess. just bought from RS once for alps dual pot which is not available from farnell. btw, farnell is at pj near jalan templer there while rs is way south, near shah alam stadium that area. |
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Nov 23 2005, 12:04 AM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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OPA2134 is very likely to go oscillating, ur better with OPA2227, its far more superior then 2134 n more stable.
BTW, any cheap alternatives to BUF634? That buffer edi out of my price range..diamond lagi la.. This post has been edited by ijan: Nov 23 2005, 12:08 AM |
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Nov 23 2005, 12:40 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(ijan @ Nov 23 2005, 12:04 AM) OPA2134 is very likely to go oscillating, ur better with OPA2227, its far more superior then 2134 n more stable. BTW, any cheap alternatives to BUF634? That buffer edi out of my price range..diamond lagi la.. OPA2134 is quite stable in my experience. unless you have a very bad soldering and introduce parasitic capacitance somewhere in the circuit. but i also suggest OPA2227 if you could get those. it just might sound better than OPA2134. cheap alternatives? the diamond buffer is quite cheap, in fact the cheapest that you could get. and sounds better than BUF634 too! the Class AB Diamond Buffer costs around RM10-20. the BC327/BC337 transistor cost about RM0.50-0.70 over here, and scales up to RM1.50 each for Philips brand (which i think sounds better than other brand, but it might just be placebo). i built my fully discreet Class A Diamond Buffer for the hybrid amp with RM30. i doubt you could reach that low if you order parts from the net though. |
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Nov 23 2005, 12:50 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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discrete buffers are cheap, really cheap especially if u dont bother to match them. There are also other way for buffering than using specific buffering chips like the BUF634, 603
Opamps oscilliating is usually due to bad populating of the components. Personally, I have never come across any opamps that oscilliates when you feed them 18V (+/- 9V) with a gain of 11. I had even run the 627 below rated minimum voltage (ran them at +/- 4.5V) and they still work perfectly. A caveat though, this is all done by practical listening, I didn't test them with a scope yet |
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Nov 23 2005, 01:23 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(ijan @ Nov 23 2005, 12:04 AM) OPA2134 is very likely to go oscillating, ur better with OPA2227, its far more superior then 2134 n more stable. BTW, any cheap alternatives to BUF634? That buffer edi out of my price range..diamond lagi la.. QUOTE(thedoctor @ Nov 23 2005, 12:40 AM) OPA2134 is quite stable in my experience. unless you have a very bad soldering and introduce parasitic capacitance somewhere in the circuit. but i also suggest OPA2227 if you could get those. it just might sound better than OPA2134. cheap alternatives? the diamond buffer is quite cheap, in fact the cheapest that you could get. and sounds better than BUF634 too! the Class AB Diamond Buffer costs around RM10-20. the BC327/BC337 transistor cost about RM0.50-0.70 over here, and scales up to RM1.50 each for Philips brand (which i think sounds better than other brand, but it might just be placebo). i built my fully discreet Class A Diamond Buffer for the hybrid amp with RM30. i doubt you could reach that low if you order parts from the net though. QUOTE(AlamakLor @ Nov 23 2005, 12:50 AM) discrete buffers are cheap, really cheap especially if u dont bother to match them. There are also other way for buffering than using specific buffering chips like the BUF634, 603 BUF634?Opamps oscilliating is usually due to bad populating of the components. Personally, I have never come across any opamps that oscilliates when you feed them 18V (+/- 9V) with a gain of 11. I had even run the 627 below rated minimum voltage (ran them at +/- 4.5V) and they still work perfectly. A caveat though, this is all done by practical listening, I didn't test them with a scope yetseem like still alot of thing hv to learn from u guyz i m so noob in this kind of thing shy |
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Nov 23 2005, 01:25 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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y dun ask the mod to put this thread on the top??
this is the nice thread!!! alamaklor....... u can do that or not with ur elite tag? |
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Nov 23 2005, 02:28 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(yeah_guyz @ Nov 22 2005, 02:25 PM) y dun ask the mod to put this thread on the top?? the elite tag is just for show this is the nice thread!!! alamaklor....... u can do that or not with ur elite tag? |
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Nov 23 2005, 02:40 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(AlamakLor @ Nov 23 2005, 02:28 AM) the elite tag is just for show haha!!! then oso give me 1 to show off la hw did u get it? ur friend is mod? or bcoz of ur post? |
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Nov 23 2005, 02:51 AM
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Senior Member
3,593 posts Joined: Feb 2005 From: ***Penang***
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QUOTE(yeah_guyz @ Nov 23 2005, 02:40 AM) haha!!! bcoz he is ex-mod then oso give me 1 to show off la hw did u get it? ur friend is mod? or bcoz of ur post? ex-mod of the case mod section and audiophiles perhaps ?? not sure about this This post has been edited by LittleLinnet: Nov 23 2005, 02:52 AM |
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Nov 23 2005, 03:01 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(LittleLinnet @ Nov 22 2005, 03:51 PM) bcoz he is ex-mod you're right. ex-mod of the case mod section and audiophiles perhaps ?? not sure about this |
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Nov 23 2005, 03:23 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(LittleLinnet @ Nov 23 2005, 02:51 AM) bcoz he is ex-mod ex-mod of the case mod section and audiophiles perhaps ?? not sure about this QUOTE(AlamakLor @ Nov 23 2005, 03:01 AM) you're right. o icic...then bcom the elite od? kena yaoyu??? haha jz kiddi ng |
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Nov 23 2005, 03:17 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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bump up this thread
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Nov 23 2005, 03:29 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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y u guyz dun try to diy the cmoy amp and sell it in bulk
if the price is cheap enough, i think alot will buy from u guyz |
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Nov 23 2005, 03:53 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(yeah_guyz @ Nov 23 2005, 03:29 PM) y u guyz dun try to diy the cmoy amp and sell it in bulk if the price is cheap enough, i think alot will buy from u guyz not as easy as it sounds la. to sell it requires a decent case, and that's the most gruesome part of the whole process. |
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Nov 23 2005, 03:58 PM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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and also, you need to mass produce the pcb with custom circuit. if not, you'll have to do lots and lots of wiring and soldering.
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Nov 23 2005, 06:19 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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casing is seriously PIA..if you want bare circuit, im sure theDocotr would consider making one
feels like a noobie to expect diamond buffers are sum leet buffer IC..hehe! |
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Nov 23 2005, 06:21 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(yeah_guyz @ Nov 23 2005, 04:29 AM) y u guyz dun try to diy the cmoy amp and sell it in bulk that's the whole point, making the pcb aint hard. but choosing a pcb layout and size is the problem since different ppl gonna use different casing...if the price is cheap enough, i think alot will buy from u guyz |
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Nov 23 2005, 06:29 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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I HATE to do casing
duno if ppl wana offer service to do casing or not |
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Nov 23 2005, 08:22 PM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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guys, i got a question
i got a dual potentiometer here, Alpha 10K log, but i can't find references to which pins do what... anybody got tips to identify them? i have a multimeter to test the resistance. This post has been edited by modD: Nov 23 2005, 08:23 PM |
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Nov 23 2005, 08:37 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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1 2 3 4 5 6 if u use multimeter measure resistance between 1 and 3, or 4 and 6, wil get 10k if u wana use for volume control 1 and 4 connected to ground, 2 and 5 connect to ur opamp input, while 3 and 6 connect to the input from audio jack This post has been edited by chernloon: Nov 23 2005, 08:38 PM |
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Nov 23 2005, 09:12 PM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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thanks!!!
but anyways, after connecting the pot, i have confirmed that my CMOY has gone FUBAR! i've transferred all the components onto a new board, double and triple checked the wirings... but no go the sound crackled horribly, i mean HORRIBLY like i just played the music through a Metal Zone distortion pedal and Mesa Boogie Triple Rectifier amp. to top it off, anything from the center channel of a song like vocals are lost. but when i slide the soundcard mixer's panning to left or right, the vocals appear, but still with the horrible distortions. and the deep hum is still there too. so that's it, i'm gonna feed this amp to the dogs (assuming they like to eat dead pcbs) and get the OPA2134 opamp from RS, and all the other materials from Pasar Road. i think the potentiometer still works though. cheers! |
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Nov 23 2005, 09:14 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(thedoctor @ Nov 23 2005, 03:53 PM) not as easy as it sounds la. to sell it requires a decent case, and that's the most gruesome part of the whole process. QUOTE(modD @ Nov 23 2005, 03:58 PM) and also, you need to mass produce the pcb with custom circuit. if not, you'll have to do lots and lots of wiring and soldering. haha kena flame liao lol |
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Nov 23 2005, 09:17 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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modD :
do u connect the ground correctly? the non inverting input and inverting input do mix up ? use signal decoupling cap? editted : are u from pj? maybe i can help u check it up if u want This post has been edited by chernloon: Nov 23 2005, 09:19 PM |
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Nov 23 2005, 09:28 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(chernloon @ Nov 23 2005, 09:17 PM) modD : wuh!!!do u connect the ground correctly? the non inverting input and inverting input do mix up ? use signal decoupling cap? editted : are u from pj? maybe i can help u check it up if u want very kind n nice people!!! good guyz |
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Nov 23 2005, 10:08 PM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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yeah_guyz: yup, the sifus here are friendly indeed
chernloon: the grounds are correct, the inputs are correct... shouldn't be a problem because i used the same schematic before. the problem began when i stooopidly decided to disassemble everything and transfer them to a new enclosure. after that poof! my 3 year old cmoy went kaput. i think i must've somehow fried the opamp during desoldering. that'll teach me to use sockets! anyway, thanks a lot for the offer to take a look at it but i think i wanna start again from scratch. if that one fries too then i might take up on the offer |
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Nov 23 2005, 10:11 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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modD:
no problem. just contact me if u need it |
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Nov 23 2005, 10:19 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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build a pimeta-like amp next, forget about cmoy. You shouldn't have any problem building something like that, and ground channel is optional
so it's just adding 2 more buffers and a few more caps. |
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Nov 23 2005, 10:59 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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QUOTE(AlamakLor @ Nov 23 2005, 10:19 PM) build a pimeta-like amp next, forget about cmoy. You shouldn't have any problem building something like that, and ground channel is optional pimeta? i bet all are waitin for ur designed-amp so it's just adding 2 more buffers and a few more caps. |
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Nov 23 2005, 11:08 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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      so tiny cool!!! but dunno hw the quality is it leh see here for more http://headphone.fileservice.co.kr/sijosae...ery/Gallery.htm |
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Nov 23 2005, 11:44 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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^ just a mini CMOY from sijosae. should sound like any other regular CMOY, but now it's in such a small enclosure.
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Nov 24 2005, 12:00 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(thedoctor @ Nov 23 2005, 11:44 PM) ^ just a mini CMOY from sijosae. should sound like any other regular CMOY, but now it's in such a small enclosure. hw much will it cost for this tiny amp??stupid ques again |
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Nov 24 2005, 12:27 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(chernloon @ Nov 23 2005, 11:59 AM) pimeta? i bet all are waitin for ur designed-amp i dun intend to release the schematics....anyone wants the schematics would have to buy one and reverse engineer the whole thing...but first...you need to scrape off the paint that I'm gonna spray on the soldering points hehehe and lets pray that the paint doesn't destroy the traces |
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Nov 24 2005, 12:30 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(yeah_guyz @ Nov 23 2005, 01:00 PM) hw much will it cost for this tiny amp?? just the typical cost of a cmoy....don't even need to pay for an enclosure. You know, you can always build somthing this small....but longer...then cover them with heatshrink....damn economic. Enclosure is one of the most expensive component in the whole amp, especially when u are gonna custom make the enclosure.stupid ques again |
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Nov 24 2005, 02:07 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(AlamakLor @ Nov 24 2005, 12:30 AM) just the typical cost of a cmoy....don't even need to pay for an enclosure. You know, you can always build somthing this small....but longer...then cover them with heatshrink....damn economic. Enclosure is one of the most expensive component in the whole amp, especially when u are gonna custom make the enclosure. quite headache in choosing the casing small and nice look d normally wat casing u go for? mint box? i heard smbody say cant pass custom oh!!!!!!1 do u facing that probelm? |
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Nov 24 2005, 02:37 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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mint is usually what people go for. Alternatively, u can use hammond's casing:
 it's too common, I'd prefer lansing-enclosure's casing |
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Nov 24 2005, 06:49 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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alamaklor :
do multilayers pcb....no need to spray anything on it but it gona cost a lot |
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Nov 24 2005, 08:31 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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overkill ler
I'd love to keep things simple and economic. A single layer board is good enough, and the casing enclosure that I chose have enough rooms to populate the components at strategic places. |
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Nov 24 2005, 10:55 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(AlamakLor @ Nov 24 2005, 08:31 AM) overkill ler I'd love to keep things simple and economic. A single layer board is good enough, and the casing enclosure that I chose have enough rooms to populate the components at strategic places.you're going to sell it as ready kits? now everyone could DIY a headamp. |
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Nov 24 2005, 11:18 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(thedoctor @ Nov 23 2005, 11:55 PM) you're going to sell it as ready kits? now everyone could DIY a headamp. no, they wont be in kits. |
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Nov 24 2005, 11:33 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(AlamakLor @ Nov 24 2005, 11:18 AM) no, they wont be in kits. AlamakLor is being so secretive of it.. guess we'll have to wait. |
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Nov 24 2005, 11:55 AM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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QUOTE(AlamakLor @ Nov 23 2005, 10:19 PM) build a pimeta-like amp next, forget about cmoy. You shouldn't have any problem building something like that, and ground channel is optional the 2 buffers would double the $$$ needed compared to a cmoy. how does it sound compared to the cmoy anyway? i'm using a Sennheiser HD590 btw... so it's just adding 2 more buffers and a few more caps.i just realized that in Tangentsoft, the part numbers for Farnell (Newark) and RS are listed, and it can be used on the Malaysian version of these sites. makes it easier chernloon, does the Alps dual pot that you got from RS has the power off feature when you dial it to the far left? how much is it? thanks... This post has been edited by modD: Nov 24 2005, 01:00 PM |
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Nov 24 2005, 01:07 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(modD @ Nov 24 2005, 11:55 AM) the 2 buffers would double the $$$ needed compared to a cmoy. how does it sound compared to the cmoy anyway? i'm using a Sennheiser HD590 btw... i just realized that in Tangentsoft, the part numbers for Farnell (Newark) and RS are listed, and it can be used on the Malaysian version of these sites. makes it easier chernloon, does the Alps dual pot that you got from RS has the power off feature when you dial it to the far left? how much is it? thanks... the sound of a buffered amp to a normal amp would be a big improvement, and might be more on low impedence headphones since those requires higher current. the ALPS dual pot available from RS don't have built in ON/OFF switch, and costs RM17 something (if i recall correctly). |
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Nov 24 2005, 01:50 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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the alps dual 50k log pot rs number is 249-9165
rm14.90. futura did get the alps with power, i think from tangentsoft. u can ask him bout it. they just have 2 extra legs for the switch connection This post has been edited by chernloon: Nov 24 2005, 01:51 PM |
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Nov 24 2005, 11:20 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(AlamakLor @ Nov 24 2005, 02:37 AM) mint is usually what people go for. Alternatively, u can use hammond's casing: where u get this casing??it's too common, I'd prefer lansing-enclosure's casing better look than mint box.. |
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Nov 24 2005, 11:36 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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you can roughly look at how an amp that's made out of that casing looks like:
http://www.fixup.net/talk/topic.asp?TOPIC_ID=1389 |
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Nov 25 2005, 12:21 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(AlamakLor @ Nov 24 2005, 11:36 PM) you can roughly look at how an amp that's made out of that casing looks like: http://www.fixup.net/talk/topic.asp?TOPIC_ID=1389 XIN Supermacro looks so freaking awesome with that case. absolutely amazing minutiarization. just wondering how much does it costs eh? one more thing, i just can't understand why most look for something portable. i find that most amp trade sound quality for that portability. |
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Nov 25 2005, 01:29 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(thedoctor @ Nov 24 2005, 01:21 PM) XIN Supermacro looks so freaking awesome with that case. absolutely amazing minutiarization. have u even heard of the sr-71? SM? hornet? and etc? If you ahvem you wouldn't have said that just wondering how much does it costs eh? one more thing, i just can't understand why most look for something portable. i find that most amp trade sound quality for that portability. ps: I've not heard of the gilmore lite, but many reputable people in head-fi have personally told me that the sr71 and similar kind of amps, despite being portable, sound much better than the Class A transistor based Gilmore lite. oh btw, the SM now retails for US$300 onwards. This post has been edited by AlamakLor: Nov 25 2005, 01:38 AM |
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Nov 25 2005, 02:38 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(AlamakLor @ Nov 25 2005, 01:29 AM) have u even heard of the sr-71? SM? hornet? and etc? If you ahvem you wouldn't have said that ps: I've not heard of the gilmore lite, but many reputable people in head-fi have personally told me that the sr71 and similar kind of amps, despite being portable, sound much better than the Class A transistor based Gilmore lite. oh btw, the SM now retails for US$300 onwards. nope, never had an audition on those before. something like a PIMETA would still be considered as a portable amp to me, and something like a PIMETA should sound quite good, but would be nowhere near a non-portable desk-amp, like a PPA/M3 design feeded with a clean steady power with huge biasing current. about the SR-71, you do know that it's more or less a properly cased META-42 right? the design is improved by its successor, the PIMETA. and yet the PIMETA is still behind the PPA/M3. if an amp is designed from the bottom up to be non-portable, then it wouldn't need to take into account current drain since it's powered from the AC line. that would allow it to use more biasing current, diamond buffer running in pure Class A with even higher bias than a BUF634 in high bandwith. but, to really know the difference, i guess i should try and build myself a Gilmore Lite/Dynalo or something from the Gilmore family. the thing is, it's hard to find the transistors used for that amp. Farnell/RS Malaysia don't even have them in stock. p/s: if should anyone be interested in Gilmore Lite/Dynalo on a regular veroboard, try peeking into sijosae's site, he minimized the circuit into a very small size, while preserving the full original design. |
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Nov 25 2005, 06:09 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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thedoctor :
maybe u can try surfing at mouser if u have credit card. AFAIK, they charge usd12 for shipping (correct me if i am wrong) |
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Nov 25 2005, 06:27 AM
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Senior Member
1,896 posts Joined: Jan 2003 From: Subang Jaya
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Portables sound better than home line amp, interesting findings hehe...
I'm still unsure whether to get portable amp or home amp, below is my shorlist: Portable line: 1) Hornet 2) Larocco PR2 3) AE-1 4) SM3 v6 Home line: 1) Gilmore lite 2) Corda Aria 3) LD3 4) Any more to recommend? Goin to puke coz read too much from head-fi and yet still undecided. Heard that M3 is not bad and just pmed MisterX to ask him build one...not sure how much will it cost to have it shipped here. And the search goes on... rgds Futura |
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Nov 25 2005, 06:53 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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First of all, you'd need some first hand experience in the perceived sonace quality of the portable amps before criticising or concluding that they do not sound as well as desktop amp at a given price. You'd also need to know that an amp's operation method does not truely dictates the quality of the amp. A Class A amp that draws constant current does not neccessarily sound better than a Class AB, Class D amp and etc(this is not something new). All these opamp based amplifiers share similar design. The Pimeta is derived from the cmoy, and the PPA is derived from the pimeta. You can even derive it further and add more stages as well as features to impress people, or claim it to be an even better amp. The SR-71, XP7, CA2, pimeta, and probably even the RM100+ edifier amp shares similar design. Do they sound the same? LOL The truth is, it takes careful planning and much tuning to attain a good sound. The SR-71, and SM has changed many people's perception in portable amp's quality. Compromise in quality? sure there's some small compromise, but those amps that I mentioned earlier bested many desktop amps out there
that have an even larger price tag. Btw, you'd also have to take built quality into consideration, a "properly cased" ppa/m3 would easily cost more than the portable amps I mentioned and when they are at different price point, you can't compare them and there is no such thing as compromise since there is nothing to compromise against. one last thing. Why people look for something portable? Coz they have the bucks to get them and want quality sound on-the-go. Was it that hard to figure out? |
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Nov 25 2005, 06:54 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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actually, I have a bunch of spare transistors and a new rev c board for the dynalo.
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Nov 25 2005, 10:40 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(Futura @ Nov 25 2005, 06:27 AM) Portables sound better than home line amp, interesting findings hehe... I'm still unsure whether to get portable amp or home amp, below is my shorlist: Portable line: 1) Hornet 2) Larocco PR2 3) AE-1 4) SM3 v6 Home line: 1) Gilmore lite 2) Corda Aria 3) LD3 4) Any more to recommend? Goin to puke coz read too much from head-fi and yet still undecided. Heard that M3 is not bad and just pmed MisterX to ask him build one...not sure how much will it cost to have it shipped here. And the search goes on... rgds Futura the thing with Solid State amp is, they sound neutral, which is a good thing until you get bored with it. good for analytical listening session, but not for normal session where you're looking for leisure. so my take would be a tube amp, prefereably a hybrid amp like the Millet Hybrid or the new Cavalli-Lovell-Pasculle that could give high current with high voltage swing. if you want something that's officially good enough without any problems (properly tested), try looking at the Millet Hybrid. the Cavalli-Lovell-Pasculle just needs further tweaking before it'll be officially 'bug-free'. but once it's officially bug-free, it'll blow the Millet Hybrid to pieces. as for something like the Little Dot series, i have no idea how it should compare to Millets, but a good amp with a good design should have no hum, no audible noise floor, and no channel imbalance. no one that built the Millet have this sort of problem, and to me that dictates design quality. sure, maybe i'll get flamed by this, but i had to say something about it. the Millet uses uncommon and hard to find 12FK6/12EA6 pentodes which should be a pain to get here in Malaysia, but pentodes has a better design than triodes, and yet the Little Dot series uses even harder to find dual triodes in it. so tube swapping should be harder to do with the LD. and no, i'm just voicing my opinion without any insights on the design used in the LD series, but if you could get me a pic of the internals, then i could give a better opinion on it. even better if i had the schematics. QUOTE(AlamakLor @ Nov 25 2005, 06:53 AM) First of all, you'd need some first hand experience in the perceived sonace quality of the portable amps before criticising or concluding that they do not sound as well as desktop amp at a given price. You'd also need to know that an amp's operation method does not truely dictates the quality of the amp. A Class A amp that draws constant current does not neccessarily sound better than a Class AB, Class D amp and etc(this is not something new). All these opamp based amplifiers share similar design. The Pimeta is derived from the cmoy, and the PPA is derived from the pimeta. You can even derive it further and add more stages as well as features to impress people, or claim it to be an even better amp. The SR-71, XP7, CA2, pimeta, and probably even the RM100+ edifier amp shares similar design. Do they sound the same? LOL The truth is, it takes careful planning and much tuning to attain a good sound. The SR-71, and SM has changed many people's perception in portable amp's quality. Compromise in quality? sure there's some small compromise, but those amps that I mentioned earlier bested many desktop amps out there that have an even larger price tag. Btw, you'd also have to take built quality into consideration, a "properly cased" ppa/m3 would easily cost more than the portable amps I mentioned and when they are at different price point, you can't compare them and there is no such thing as compromise since there is nothing to compromise against. one last thing. Why people look for something portable? Coz they have the bucks to get them and want quality sound on-the-go. Was it that hard to figure out? ah, that reason. music on the go. i don't really take the music with me, so the music stays in my room. maybe that's why i don't really need it to be portable. you got that right, a properly cased M3/PPA should cost more than its portable counterparts, but not that too far off. TerTop did say that a fully assembled M3 should be around RM1.4k (which would float at the same pricetag as a portable amp). most people did say that the SR-71 has properly selected components and better component matching (or issit component selection) to get the best sound and thus the premium for it. QUOTE(AlamakLor @ Nov 25 2005, 06:54 AM) actually, I have a bunch of spare transistors and a new rev c board for the dynalo. i could assemble a Dynalo is there's components, and put it up against something like an M3 (which i'm thinking of building to testdrive a pair of bookshelf). that would be a very interesting comparison. or why don't you complete your Dynalo and compare it against the SR-71? |
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Nov 25 2005, 11:28 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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dunno, i just dun have the feel in finishing it. if u want the transistors for the dynalo, i'll send it back together with the opamps. the transistors only cost a few bucks
btw, I hope I didn't sound aggressive/offensinve in the post, wasn't my intention. Diy is a good route, hard to disagree, but business is business, you wounldn't be selling an amp at cost would you? Diy = cost price.This post has been edited by AlamakLor: Nov 25 2005, 11:38 AM |
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Nov 25 2005, 11:35 AM
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Senior Member
1,896 posts Joined: Jan 2003 From: Subang Jaya
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So far Ive seen only Headroom desktop millett hybrid is commercially available and it cost $649
What is the price for a DIY'ed millett hybrid? With standard specs...will try ask around head-fi if they are willing to build one |
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Nov 25 2005, 04:52 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(AlamakLor @ Nov 22 2005, 02:02 AM) unlike cooking, any people with above average electronics knowledge would be able to recrete the same thing as long as you have the recipe. At least for something like simple headphone amps like these. http://forum.lowyat.net/index.php?showtopi...1&#entry5369961see here recipe oh |
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Nov 25 2005, 09:41 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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there's a problem, I can't see the top view properly, the wires are blocking some of the views. other than that, I've got a good idea how it is like. yet another cmoy-type amplifier
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Nov 25 2005, 10:32 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(AlamakLor @ Nov 25 2005, 09:41 PM) there's a problem, I can't see the top view properly, the wires are blocking some of the views. other than that, I've got a good idea how it is like. yet another cmoy-type amplifier so ??is it really cost RM200++ |
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Nov 25 2005, 10:38 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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QUOTE(yeah_guyz @ Nov 25 2005, 10:32 PM) so ?? even a basic cmoy also cost almost usd40 alreadyis it really cost RM200++ |
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Nov 25 2005, 11:34 PM
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Senior Member
3,593 posts Joined: Feb 2005 From: ***Penang***
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UsD40 and RM200++ still got some diffrence
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Nov 25 2005, 11:38 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(LittleLinnet @ Nov 25 2005, 11:34 PM) UsD40 and RM200++ still got some diffrence agree |
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Nov 26 2005, 02:28 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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aiyo, tat kind of thing oso wanna consider..if you wan really really cheap amp, u can make one for the cost of about..less than rm10 for the circuit alone, with all jacks n 9v dc supplied, not more than rm15! u wan ka i make, charge you rm50
but be suprised of the quality, the super mega powerful ubiquitos ua741 opa! the most widely used opa in the werld, haha! seems like yeah guys is the liveliest fella in audiophile currently, hehe! bravo laa.. |
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Nov 26 2005, 02:40 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(ijan @ Nov 26 2005, 02:28 PM) aiyo, tat kind of thing oso wanna consider..if you wan really really cheap amp, u can make one for the cost of about..less than rm10 for the circuit alone, with all jacks n 9v dc supplied, not more than rm15! u wan ka i make, charge you rm50 but be suprised of the quality, the super mega powerful ubiquitos ua741 opa! the most widely used opa in the werld, haha! seems like yeah guys is the liveliest fella in audiophile currently, hehe! bravo laa.. u make for littlelinnet la he want hehe coz wanna learn somthing here ma so noob in portable amp so jz learn and ask here lo |
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Nov 26 2005, 04:38 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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no hal, the gurus here are frenly (im no guru, im jus a noobie, lookie at my avatar, hehe!). but the 741 OPA is not sonically recommended, haha! i was fooling around, but by changing the 741 to a better OPA say 227 2134/2 u can get a good solid state opa amp.
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Nov 27 2005, 03:29 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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 ah, now i see some pics. thanks for the post. i see a National Semiconductor LM4 881N which is a 'Boomer Dual 200 mW Headphone Amplifier with Shutdown Mode' and i see 2 pairs of Panasonic (most probably, but not FA/FC) caps and 2 similar Panasonic caps for the OpAmp. the LM4881N is a CMOS Operational Amplifier made by National Semiconductor that has high output power in regard to input voltage/quiescent current. looking from the specs available from here and datasheet available from here, the amp has somewhat good (okay, maybe so-so but still acceptable) specs. with a maximum of 200mW of output power, that should be enough for current hungry cans. but wait, at 10% THD/Noise? (which is Total Harmonic Distortion BTW)i guess the 200mW specs is just for show. nope, we won't be seeing that 200mW figure anytime soon with the normal usage now would we? how about searching for a figure that's more logical? how about 32 Ohms at 3V (which is the nominal voltage) and a THD at something acceptable (less than 1% sounds about right). that brings us to 30mW of maximum output power. now that sounds more likely. an amp operating with 3V gives 30mW of maximum output power at 0.1% THD. that brings the chip to normal level you would see with any other regular Op-Amp. no more hallucinating '200mW of output power'. and what does the 2 pairs of caps do? virtual ground? not likely. input caps? with a rating that huge? and why would anyone use an electrolytic caps for input caps? that would deem rather 'unintelligent'. as someone mentioned before in a thread before this (the writer should know who he is, but i can't remember), electrolytics are the lowest quality of caps. and using them on unamplified input signals would mean huge low freq attenuation which translates to bass roll-off, or in plain english 'less bass'. electrolytics also cut-off the high freqs and leads to loss of details (well all type of caps do, but electrolytics does it better). and the 2nd smaller caps pair? what are those? a quick glimpse at the datasheet, and i see something about input cap and output cap. it seems that the chip requires a pair of input cap and a pair of output cap in the typical application diagram. reading the datasheet a few times to make sure i'm not making a mistake and trying to trace the circuit just so that i'm not stating some bullsh1t over here, i think the chip does require an input cap and an output cap. and the amp does include it in the design. that would mean that the amp don't have any kind of virtual ground implementation to separate the signal ground from the voltage ground, and requires caps in the signal path to decouple the voltage. you're kidding me? virtual ground needs like 2 more resistors. now that would sound very nasty right? input+output cap = spells disaster. how catastrophic? see below. the graph is for 32Ohm impedence.  see the bass roll-off at 20Hz? at -15dB? hohoho. i think we got outselves a winner. QUOTE(Categg @ Nov 26 2005, 03:13 PM) First time listening impression: - Bass slightly deeper and it's very much punchier - Doesn't sound as dark as the PA2V2, highs sound crisper - Definately goes very loud on my 55 Ohms impedence headphone - Better instrument seperation - More details.. or maybe i'm just imagining them? i can tell why the bass is deeper and punchier. because it has lower roll-off. i can tell why it doesn't sound as dark. because it's not using electrolytics input caps. i can tell why it has better detail. because it's not using electrolytics. oh i already mentioned that. look at the graph, the chip starts linear amplification at near 1Khz. that would be too high for good bass. sure, it's linear, but the electrolytics would have cut off some of the high freqs even before the chip could amplify them. i could trace the datasheet and compare the LM4881 to the lowest grade OPA2134 or even the TL072 and it wouldn't be surprising to see the LM4881 loses out. but i have better things to do. QUOTE(Shogun) Okay. Here is my take on the PAV2. My friend medufsaid lent me his HD600 for a day so i could A/B the two headphones with the headamp. It seems that the PAV2 gave my HP1000 a VERY NOTICEABLE improvement, whereas the HD600... improvement was almost non existant. Don't know why. By improvement, I meant comparing headphone out on CD Player (Marantz CD5400) to the output on PAV2. Since HD600 no big improvement, my review will focus onli on the HP1000. When I first got it, and since so desperate, I used EVEREADY batteries (my rechargeable still with friend). Damn. Got Hissing sound. Beh tahan, so I turned it off, and waited until night time for my rechargeables. Hissing was gone of course. First impression, can hear much more details, instrumental rendition is even more realistic, separation of different instruments is better, tho when it comes to ultra complex parts (like damn lots of instruments in the orchestra are playing), still sounds a bit "rojak". Could be headphone limitation. Oh, and soundstaging has even markedly improve. When listening to classical music, it's not just left-right difference, I could even feel the near-far imagery in my mind. In other words, the music has become somewhat more 3-D. However, initial impressions also noted slightly bloated bass, and highs not singing out enough. I left the thing running non-stop for around 48 hrs and went back to it. Bass was not so bloated anymore; and highs were singing better now. To give you guys a picture where this combo stands, CD5400 + PAV2 + HP1000 comes close to CD5400 + HD600 (not fully burned in). Oh and finally, this thing does WONDERS for my AV-710. Now I can finally use my HP1000 with the computer. I haven't pitted the CD5400 against the AV-710 (playing audio CDs), but I'll save that for another day. Phew. So long. i could tell you why. because the amp don't have enough voltage swing to make a difference. the swing most probably be from half of the voltage to 0V/3V since the amp don't use any virtual ground. well theoritically anyway. on perfect operation, that would be from 0V-1.5V-3V, but on typical operation, that would mean something like 0.2-1.2|1.7-2.8 or something like that. should be something like a 1.2/1.3V voltage swing. that would make no difference for something that has high impedence such as the HD-600. heck, even some DAC have that level of voltage swing. yeah, some external DAC have a very high voltage swing in case you don't know. QUOTE(AlamakLor @ Nov 25 2005, 09:41 PM) there's a problem, I can't see the top view properly, the wires are blocking some of the views. other than that, I've got a good idea how it is like. yet another cmoy-type amplifier naah. this is in no way another cmoy-type amplifier. not even close to it. this is a regular lets-copy-the-typical-application-in-the-datasheet-and-change-cap-size type of amplifier. [i'm so gonna get flamed by this]  What overkill means to me? RM7.41 for the chip, RM3 for the case, RM6 for the jacks, RM6 for the potentiometer, RM2 for the switch, and RM etc for everything else would mean like less than RM50 of parts. give a lifetime warranty, and price it 400% higher. and getting people to buy it, saying how good it is, is 'priceless'. |
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Nov 27 2005, 03:36 PM
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Senior Member
1,896 posts Joined: Jan 2003 From: Subang Jaya
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Excellent analysis and justification, thedoctor.
I was thinking to get one for my portable setup, but after reading this, I think I will stick to my cmoy2 (soon to DIY...) |
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Nov 27 2005, 03:58 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(AlamakLor @ Nov 25 2005, 11:28 AM) dunno, i just dun have the feel in finishing it. if u want the transistors for the dynalo, i'll send it back together with the opamps. the transistors only cost a few bucks btw, I hope I didn't sound aggressive/offensinve in the post, wasn't my intention. Diy is a good route, hard to disagree, but business is business, you wounldn't be selling an amp at cost would you? Diy = cost price.er, i think i have to pass. most of the transistors used in the design is not readily available to me, and i have to get them from the net. that would mean ridiculously pricing and waiting time. nope, that's the same reason i'm not offering any DIY amps for sale. cause i don't have any idea about the price. i can't price my effort and time for it. QUOTE(Futura @ Nov 25 2005, 11:35 AM) So far Ive seen only Headroom desktop millett hybrid is commercially available and it cost $649 What is the price for a DIY'ed millett hybrid? With standard specs...will try ask around head-fi if they are willing to build one judging from the design (which i copied and optimized for the much available 6DJ8 tube), the cost of the amp itself is about RM250 including boutique parts and diamond buffers. but people did say the lowest that you could get in the States is USD400 for the parts alone. so the Headroom price is just about right. now, would anyone be interested if i offer a hybrid tube amp for something like RM400 (for a basic design with an Op-Amp output stage)? yes, properly cased, with power supply, IEC inlet plug and properly tested. the design will be following the Cavalli-Lovell-Pasculle (SOHA) raved about in Headwize. i'm saying this because i'm thinking of building it, and so i might just build a couple more unit along with it. i'm ordering the 'missing' parts in a few days (parts that i couldn't get in electronic shops). and just for the records, this amp would beat the Hybrid Millet/MHHA/YAHA or any other amp that runs on DC power. tested the newly power transformer design and indeed it got to dangerous voltage (nearly 70V). good enough for shocking anyone to death. |
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Nov 27 2005, 04:08 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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aiya theDoctor, u went straight out..kesian them..though in fact in my lil heart its kinda good that they finally know what they are getting..since i did voice out myself to few buyers bout the downside of the amp before they got theirs.
Well..to make matters worse la since its already bad, at normlaized freq of f=1khz, the better OPA227 has a 0.00005% THD while the OPA134 is at 0.00008%..compare that to 10%. OPA227 has minimally flat gain between 4Hz-300KHz while the OPA134 200Hz-120KHz. Well..for comparison purposes only ya.. But dun be let down yet since the P2AV2 can still be saved..void the warranty la..change to a better OPA, use 9V battery, n proper mod to the circuit eg the caps and all. AECs are the worse caps available, but it is the only design that allows humangous charge to be strored..but then again..ur better off building a new one from scratch This post has been edited by ijan: Nov 27 2005, 04:15 PM |
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Nov 27 2005, 04:19 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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just notice that, RM400 for a hybrid tube is nice
gonna see sum sales of DIY here then, bravo! |
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Nov 27 2005, 04:21 PM
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Senior Member
1,896 posts Joined: Jan 2003 From: Subang Jaya
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I'm in for one, errr...is it SOHA? thedoctor UGPM!
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Nov 27 2005, 04:26 PM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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Hahah... Good reply. Let me forward it to Gary, wishfully he can tell us something and also why he got the award.
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Nov 27 2005, 04:49 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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doctor..
very nice analysis o |
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Nov 27 2005, 05:17 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(Futura @ Nov 27 2005, 04:21 PM) I'm in for one, errr...is it SOHA? thedoctor UGPM! yes, it's the SOHA. the Stoopidly simple amp that's on par (if not better) than the Cavalli-Jones (a variation of Morgan Jones amp). the development thread here. impression from the first builders : QUOTE(Batman) The amp (like the YAHA) is stoopidly simple and has less than $50.00 worth of parts and no lethally high voltages. It would make an ideal tube headphone amp for those who'd like one but fear high voltage. OK, how does it sound, well, in a word, stoopidly good. When I first powered up the prototype, the plate voltage was only 17V and the amp sounded decidedly solid state, kinda "steely" and just tonally "off". As we raised the plate voltage the sound became more lush and tube-like and I began not to believe my ears. This thing easily rivals my Cavalli-Jones which cost over three times more to build! It's got decent amounts of nice bass,classic sweeet tube midrange and plenty of top end extension. Also,the soundstage is extremely wide and respectably deep. This thing is just plain stoopid fun to listen to! Another remakable thing is that this thing can drive cans of any impedance. It sounds really reamarkable with my Sennheiser HD600's but can also drive my Shure E3C (28 Ohms) and Sennnheiser HD280 Pro (64R). the part count if very low that i think i could cramp it into the same case that i'm using for my tube amp. but the idea of working with high DC voltage in such a cramped space should prove dangerous. right now, i'm thinking of separating the power section into another case, and the amplification section into the main case. that should minimize AC hum from the power line since the SOHA doesn't incorparate any power filter in the design. the thing about this amp is that it's designed from the bottom up to be versatile with any impedence. the use of Solid State for output buffer would mean that it has high current together with high voltage swing to drive any cans without requiring any tweaks. |
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Nov 27 2005, 05:49 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(ijan @ Nov 27 2005, 04:08 PM) aiya theDoctor, u went straight out..kesian them..though in fact in my lil heart its kinda good that they finally know what they are getting..since i did voice out myself to few buyers bout the downside of the amp before they got theirs. surely, you did get flamed right? then just kept your mouth shut.. QUOTE(DAViS @ Nov 27 2005, 04:26 PM) Hahah... Good reply. Let me forward it to Gary, wishfully he can tell us something and also why he got the award. i never tried the LM4881 before, so i have no idea whether it will work with virtual ground or not. the datasheet didn't say anything about it (or have i missed it?). but, if it works with virtual ground, then all you need is another wire from half of the power supply (half of the battery) and you could screw the divider resistors. that would mean even less part. you could screw the output caps, the input caps, the virtual ground circuit, the divider resistors and make even more money. ^ but i kindda doubt the chip will work with virtual ground implementation. i have a hunch, but i'm lazy to go through the datasheet. there's even more reading if anyone's interested. but most are very technical articles and could prove rather 'uninteresting'. Input Capacitors for Headphone Amps by Tangent Picking Capacitors by Walter G. Jung (inventor of Jung MultiLoop) The Sound of Capacitors by Steve Bench the most interesting article should be this : The Sound of Capacitors - Electrolytics by Steve Bench excerpts : QUOTE There are a couple of items to note: * The so-called non-polarized parts with no bias look dangerously like the polarized parts with no bias. That probably tells you "worth" of the non-polarized parts. Don't depend on that characteristic. * With relatively healthy biasing (100 volts) the hysteresis has disappeared. If you look carefully though, you can note that the characteristics is curved, indicating non-linear operation. Apparently the hysteresis was "hiding" the otherwise non-linear character of these parts. For high quality audio, these parts are probably best avoided. |
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Nov 27 2005, 06:03 PM
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Senior Member
3,593 posts Joined: Feb 2005 From: ***Penang***
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QUOTE(thedoctor @ Nov 27 2005, 03:58 PM) er, i think i have to pass. most of the transistors used in the design is not readily available to me, and i have to get them from the net. that would mean ridiculously pricing and waiting time. so, you won't be selling any diy amp yea ??nope, that's the same reason i'm not offering any DIY amps for sale. cause i don't have any idea about the price. i can't price my effort and time for it. then how about providing all those needed equipments including board ?? |
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Nov 27 2005, 07:12 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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QUOTE(thedoctor @ Nov 27 2005, 05:49 PM) surely, you did get flamed right? then just kept your mouth shut.. Not really..cos i shut up..haha! well, now i think wont get flame liao since u bothered to haf one helluva detail loo for it Well linnet, i did plan on building DIY Cmoy amp like almost 2 months ago for a few friends at my campus..but i just got my component like a week ago..so u can imagine the frustration of waiting..not to mention my fren lari edi, haha! So now, after almost 2 months of waiting, i haf all the parts..but no time, baru habis my exam..later next week finally assemble them If u care to wait..a veryy long time, u can get one up and running sum ppl might be able to help you wit that..say me, hahaha! This post has been edited by ijan: Nov 27 2005, 07:16 PM |
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Nov 27 2005, 07:42 PM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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QUOTE I read through the forums and all of the pages, it took about two hours to read everything and I am happy that people are enjoying their PA2V2s. ---------------------------------------- After building one thousand, seven hundred and forty-nine amplifiers during the past two and a half years, there have been a few people who have not heard the amp, but shared their thoughts and criticisms. I am a peaceful soul and do not wish to argue with anyone. I really respect everyone's opinion and never felt that I needed defend the amps I build. Sure, the PA2V2 is not perfect; I will be the first to admit that. However, the amp has been improving and I know it has made a lot of people very happy, including myself. If there wasn't something very special about the PA2V2 then there is no way over 1000 people would own one, nor would the amp be featured inside well respected magazines like the WholeNote and the Absolute Sound. Almost every day someone emails me to share their feelings about how the amp has improved their ability to enjoy music. This is something wonderful that keeps me happy inside. This is the #1 reason why I continue to build these amps. Here is Gary reply. This post has been edited by DAViS: Nov 27 2005, 07:57 PM |
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Nov 27 2005, 07:43 PM
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Senior Member
3,593 posts Joined: Feb 2005 From: ***Penang***
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QUOTE(ijan @ Nov 27 2005, 07:12 PM) Not really..cos i shut up..haha! well, now i think wont get flame liao since u bothered to haf one helluva detail loo for it will you really want to help me ??Well linnet, i did plan on building DIY Cmoy amp like almost 2 months ago for a few friends at my campus..but i just got my component like a week ago..so u can imagine the frustration of waiting..not to mention my fren lari edi, haha! So now, after almost 2 months of waiting, i haf all the parts..but no time, baru habis my exam..later next week finally assemble them If u care to wait..a veryy long time, u can get one up and running sum ppl might be able to help you wit that..say me, hahaha! i just one to get one that doesn't cost must, doesn't sound worse than the souncard output, with volume controll that's all, basic only........ |
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Nov 27 2005, 07:54 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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 1) The single cap at the top is for the shutdown function, to minimize idle current draw. 2) the middle cap is the main power reservoir.......(well....this small?) 3) the two smaller caps at the bottom are input caps. 4) the two larger caps are output caps. (removed an unpleasant statement )Gary's reply: QUOTE I will explain more about Number 1 and 2 above, which are almost correct, but simply reversed. The single capacitor at the top is a power supply filter that reduces noise from the DC signal, especially if an AC adapter is used. This capacitor also stores a supply of quick electricity for when it is needed. An example of this case would be during the occurrence of a low frequency note in a song. The middle capacitor is there to channel high frequency (unwanted) noises out of the amplifier, so that it can operate more quietly. it was funny though, I thought there must be something seriously wrong to have such a small power cap, seems like I reversed the shutdown cap from the power cap This post has been edited by AlamakLor: Dec 2 2005, 04:21 PM |
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Nov 27 2005, 07:56 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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sorry, I dun have the exact value for the components, whoever has the amp could fill in the blanks though.
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Nov 27 2005, 08:25 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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er..its a single invertin amp?
what's the difference in term of sound for using invertin amp compare to non-invertin amp? |
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Nov 27 2005, 08:36 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(chernloon @ Nov 27 2005, 09:25 AM) er..its a single invertin amp? have never looked into it. You know what's funny about the amp? the pot is on the feedback loop. turning the pot changes the gain, bandwidth, and etc. basically the sound changes every moment you turn the pot what's the difference in term of sound for using invertin amp compare to non-invertin amp? there's an interesting thing about this kind of design. The amp sounds best with low impedance phone, since they require very low gain to drive them, and at lowest gain you achieve highest bandwidth. as you increase the volume, the quality of the amp depreciates. imho, this amp is designed to drive low impedance phone. The amp's quality depreciates as you increase the volume (which in this case you are increasing the gain, lowering the bandwidth). What more is that the amp's working voltage is so low that it's gonna clip when driving high imp phones. I wouldn't say the amo suck or anything, after all he did sell quite a number of them. However, there are plenty of room for improvements (without adding lots more to the cost obviously.)Gary's reply QUOTE The potentiometer is intentionally kept out of the This post has been edited by AlamakLor: Dec 2 2005, 03:15 PMaudio signal's path in the PA2V2. I believe the fewer components the precious audio signal passes through, the better. The gain in the PA2V2 changes from 0 to about 6 as the volume knob is turned. I designed the internals of a working opamp (http://www.electric-avenues.com/research.html) during my fourth year of electrical engineering. During this project I became familiar with the gain/bandwidth relationship. The truth is that bandwidth does depreciate with higher gain in every opamp. The audio bandwidth of the PA2V2 becomes effected when the voltage gain reaches over 30,000 (90dB). Because the amp has a maximum gain of around 6 (15dB), we are still very safe. |
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Nov 27 2005, 11:40 PM
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Junior Member
231 posts Joined: Sep 2004
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My ugly looking DIY Tube Preamp
tone. |
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Nov 27 2005, 11:45 PM
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Senior Member
1,896 posts Joined: Jan 2003 From: Subang Jaya
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Wow another hardcore DIYer
Those tubies...made me droooooooool all the way Keep 'em coming |
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Nov 27 2005, 11:45 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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for this inverting amp, the gain will be lesser compare to non inverting. its Rpot over the R at the input there. however, the output of the opamp will be inverting !
not sure how this sound, but for pure sin wave, easily seen on the oscilloscope |
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Nov 27 2005, 11:57 PM
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Junior Member
231 posts Joined: Sep 2004
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QUOTE(Futura @ Nov 27 2005, 11:45 PM) Wow another hardcore DIYer Those tubies...made me droooooooool all the way Keep 'em coming They are VR tubes!..Looks really nice when lights off..Purple (OB3) & Pink (OD3) More Picture. 
tone. |
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Nov 28 2005, 12:04 AM
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Senior Member
1,896 posts Joined: Jan 2003 From: Subang Jaya
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Nice nice...are they hot? Like hot chicks
Let me see...7 tubes altogether! Must be sounds like angels sing What is the cost for doing this tube amp? |
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Nov 28 2005, 12:38 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(tone @ Nov 27 2005, 11:40 PM) My ugly looking DIY Tube Preamp tone. tone, where did you get the transformers for it? i'm also looking for some high voltage transformers, but they're really hard to get over here. i'm looking for a 260V-0V-260V transformers. any current rating would be fine (just needs a minimum of around 100mA of current for the plate). i could get all other parts, but not the transformers. |
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Nov 28 2005, 01:58 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(Futura @ Nov 28 2005, 12:04 AM) Nice nice...are they hot? Like hot chicks i so wanna knw the cost ...Let me see...7 tubes altogether! Must be sounds like angels sing What is the cost for doing this tube amp? more than 1K?? |
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Nov 28 2005, 03:09 AM
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Junior Member
231 posts Joined: Sep 2004
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QUOTE(thedoctor @ Nov 28 2005, 12:38 AM) tone, where did you get the transformers for it? i'm also looking for some high voltage transformers, but they're really hard to get over here. i'm looking for a 260V-0V-260V transformers. any current rating would be fine (just needs a minimum of around 100mA of current for the plate). i could get all other parts, but not the transformers. they are custom wound transformer by a technician..i had 250-0-250 600ma with core grounded on my preamp..shoot me a PM..ill give u the contact number.QUOTE(yeah_guyz @ Nov 28 2005, 01:58 AM) i so wanna knw the cost ... less then 1k actually..more than 1K?? VR tubes from ebay & 6H30 Octal socket from singapore. i use 6080 as diode. those two polyprop caps are motor run caps. choke from Hammond. Resistor by Riken Ohm. Relay socket as 8pin Octal Socket..cost RM5 bucks only. tone. |
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Nov 28 2005, 03:36 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(tone @ Nov 28 2005, 03:09 AM) they are custom wound transformer by a technician..i had 250-0-250 600ma with core grounded on my preamp..shoot me a PM..ill give u the contact number. wah less then 1k actually.. VR tubes from ebay & 6H30 Octal socket from singapore. i use 6080 as diode. those two polyprop caps are motor run caps. choke from Hammond. Resistor by Riken Ohm. Relay socket as 8pin Octal Socket..cost RM5 bucks only. tone. but it look really cool cant even wait for u to assembling the enclosure le |
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Nov 28 2005, 07:16 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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 any guy out there know where to get this type of 1/4" output jack / knob? just know its Neutrik Re-An ¼" output jack, with the silver color outfit , don know if its come together with the jack or added part any place to get this? or any code for mouser or digikey thanks |
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Nov 28 2005, 10:17 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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I'm using the exact same knob and jack for my amps. The knob is an eagle plastic aluminium knob, I really like the sleek look of it. The jack is probably a neutrik switch jack, but obviously there are many more manufacturers. the knobs are available at mouser, digikey doesnt carry it. the jack's probably available from both. I can get you the exact part number when I get home.
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Nov 28 2005, 10:43 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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thanks a lot, man
cant wait to get it might wana find if there is any such knob suitable for 3.5mm jack or not wana get for both the 3.5mm and 1/4" knob |
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Nov 28 2005, 11:24 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(chernloon @ Nov 28 2005, 11:43 AM) thanks a lot, man i have lots of spare, and I'm gonna stock up in a week or two. if you need any specific parts, just pm me and I'll sell them to you at cost + shipping (RM15-18). the shipping is higher than usual since they can't go with padded envelope. Anyway, if anybody need any specific parts, especially precision parts, you could just pm me with whatever you want and I'll put them in my list when I order them next and the shipping of RM15-18 could be shared. cant wait to get it might wana find if there is any such knob suitable for 3.5mm jack or not wana get for both the 3.5mm and 1/4" knob At the mean time, I'm working on a cmoy pcb, probably gonna sell them in kits. I need to get my gawd damn amp done soon but it's very troublesome since some parts are only available from digikey, some are only available from mouser. my sr-71 will be gone in a week or two |
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Nov 29 2005, 12:08 AM
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Senior Member
1,896 posts Joined: Jan 2003 From: Subang Jaya
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Got this CMOY2 pcb from sg. Hehe...copyrighted stuff.
 Bought it months ago but never had time to work on it. After X'mas, maybe... |
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Nov 29 2005, 12:51 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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lol, who the heck needs to copyright a cmoy type amp
all these stuff are already etched into my mind.btw, just guessing though, C1 and C2 are either inout/output caps. You can jumper them if dc offset is <20mV This post has been edited by AlamakLor: Nov 29 2005, 12:53 AM |
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Nov 29 2005, 06:21 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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QUOTE(AlamakLor @ Nov 28 2005, 11:24 PM) i have lots of spare, and I'm gonna stock up in a week or two. if you need any specific parts, just pm me and I'll sell them to you at cost + shipping (RM15-18). the shipping is higher than usual since they can't go with padded envelope. Anyway, if anybody need any specific parts, especially precision parts, you could just pm me with whatever you want and I'll put them in my list when I order them next and the shipping of RM15-18 could be shared. can give me the mouser code for the eagle plastic alu knob? wana check bout it and a few others first before comfirm with u At the mean time, I'm working on a cmoy pcb, probably gonna sell them in kits. I need to get my gawd damn amp done soon but it's very troublesome since some parts are only available from digikey, some are only available from mouser. my sr-71 will be gone in a week or two |
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Nov 29 2005, 09:04 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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1/4" neutrik RE-AN phone Jacks:
Mouser P/N - 550-22302 Mfg P/N - NMJ6HCD2 1.1" Eagle plastic aluminium knob Mouser P/N - 450-6017 Mfg P/N - 450-6017 |
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Nov 29 2005, 10:01 AM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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 sorry, just now din mention clearly. i mean is this 1, inside is the neutrik jack, but the outside, aluminium color that 1, is it part of the jack itself? or its an add-on |
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Nov 29 2005, 10:52 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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yes it's part of the jack. It's a screw in attatchment to lock them at the front panel (duh). It's not neccessary though, only neccessary when you need to float the ground channel (e.g. for amps like pimeta/ppa)
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Nov 29 2005, 12:51 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(AlamakLor @ Nov 29 2005, 10:52 AM) yes it's part of the jack. It's a screw in attatchment to lock them at the front panel (duh). It's not neccessary though, only neccessary when you need to float the ground channel (e.g. for amps like pimeta/ppa) how much you bought those for? |
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Nov 29 2005, 01:14 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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QUOTE(thedoctor @ Nov 29 2005, 12:51 PM) how much you bought those for? last time i wana show u is this type...but cant find in farnell nor rs. the price at mouser is (in usd)1 : $0.95 10 : $0.87 if u manage to get it in jb, do tell me, wana ask u help me get some too |
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Nov 29 2005, 03:03 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(chernloon @ Nov 29 2005, 01:14 PM) last time i wana show u is this type...but cant find in farnell nor rs. the price at mouser is (in usd) 1 : $0.95 10 : $0.87 if u manage to get it in jb, do tell me, wana ask u help me get some too those connector looks odd. never stumbled upon them before over here. if i manage to find them surely i'll use them.er, since it's so cheap (less than RM4), why don't you order a couple of them from the net, i'll take 10 of it. |
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Nov 29 2005, 03:11 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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i wana order it with some components for M3 and the STEP, and the jack socket as well, but will do 1 shot together coz shipping is usd12
maybe after christmas coz this month is "tight" already aarrggghhh... |
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Nov 29 2005, 03:16 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(chernloon @ Nov 29 2005, 01:14 PM) last time i wana show u is this type...but cant find in farnell nor rs. the price at mouser is (in usd) 1 : $0.95 10 : $0.87 if u manage to get it in jb, do tell me, wana ask u help me get some too eh wait, i put it 'neutrik' in farnell (my.farnell.com) and got a whole bunch of results. selected 'Jack Sockets' afterwards and got some results that i think might be the jack. chernloon, help me out here. please confirm the model cause i'm ordering from Farnell for polypropylene caps and CCS JFET for the SOHA. gonna hold-up the order until tomorrow. please confirm the model and i'll get it with the package. would be nice if we could use Neutrik connectors in it, that would make the SOHA even closer to 'audiophile grade'. |
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Nov 29 2005, 04:00 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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the model is NMJ6HCD2, to ur dismay, is not available in farnell.
last time u bought things from which company in jb? can u try to find there? if really cant get it, then use normal cheap 1/4" jack first, and after i order and get it, then can change it individually. if u wan, can ship it to u later. |
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Nov 29 2005, 04:24 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(chernloon @ Nov 29 2005, 04:00 PM) the model is NMJ6HCD2, to ur dismay, is not available in farnell. last time u bought things from which company in jb? can u try to find there? if really cant get it, then use normal cheap 1/4" jack first, and after i order and get it, then can change it individually. if u wan, can ship it to u later. ok then. guess the cheap chinamade jacks have to be used first. i'll try looking for it nonetheless. who knows might just be lucky. |
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Nov 29 2005, 04:43 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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use the 1/4" so easier to b replaced, no need to drill hole again
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Nov 29 2005, 07:53 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(chernloon @ Nov 29 2005, 04:43 PM) use the 1/4" so easier to b replaced, no need to drill hole again will do.. |
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Nov 30 2005, 01:17 PM
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Senior Member
936 posts Joined: Jun 2005
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Ive got a question. Would it be ok if I used 7812 and 7912 to regulate the power for a small amp i'm building ?
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Nov 30 2005, 01:19 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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QUOTE(sakaic @ Nov 30 2005, 01:17 PM) Ive got a question. Would it be ok if I used 7812 and 7912 to regulate the power for a small amp i'm building ? ya...but ur input to the 7812 and 7912 must b bigger, 14 volt or higher will b betterelse u wont get a stable 12V output |
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Nov 30 2005, 04:38 PM
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Senior Member
936 posts Joined: Jun 2005
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ok thanks...was worried that I would be getting stuff liek hums and other what nots. Curently building small LM3886 amps to drive small speakers so I'm currently pumping in +-15V from the trans.
Anyway, Iwas wondering, for those amps where the input s +-30V how do you guys regulate the voltage ? This post has been edited by sakaic: Nov 30 2005, 04:43 PM |
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Nov 30 2005, 04:48 PM
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Senior Member
515 posts Joined: Jun 2005 From: Kelana Jaya
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about hum and noises, i am not sure coz i never try it
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Dec 9 2005, 02:40 AM
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Senior Member
1,747 posts Joined: Nov 2004 From: serdang selangor
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wow..i'm impressed..good effort guys..
u guys are becoming sound engineer or what? |
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Dec 10 2005, 02:12 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(sakaic @ Nov 30 2005, 04:38 PM) ok thanks...was worried that I would be getting stuff liek hums and other what nots. Curently building small LM3886 amps to drive small speakers so I'm currently pumping in +-15V from the trans. you mean dual rail +-30V to get +-15V? that's a 15V drop across each regulator, and quite high if you ask me. if you draw more than 500mA from the rail, the regulator would get VERY hot. hot in the sense that you can't possibly touch if, and even if it still works, the temperature could introduce voltage drift and make the regulator unstable.Anyway, Iwas wondering, for those amps where the input s +-30V how do you guys regulate the voltage ? the LM78XX and LM79XX series could be used, but i do think that the LM317/LM337 pair with better filtering could prove better. i've tried dropping about 10V across LM7812 and LM7912 and there's indeed some voltage drift. quite huge if you ask me. the voltage from positive rail drifts from 11.8V-11.96V and the negative rail drifts from -11.90V to -12.01V. and yes, there's proper filtering caps before going into the LM7912 and LM7812 and proper filtering caps at the output. with the LM7812/LM7912, you can't adjust the rails to get precise output voltage and with the stock setting, there's quite a marginal error. so my take would be the LM317/337 pair. for the +-30V into +-15V, my advice is to separate it into 2 phase. the first to drop the voltage to +-24V using LM7824/LM7924 then going into LM317/LM337. but if you draw low current from it, the first phase might not be needed and you could get away with only the LM317/337. try it out. if the temperature is low, then you don't need the LM7824/LM7924. p/s: precise output voltage might not improve anything, but in the world of audiophiles, everything improves the final sound. yes, power cables included. take a look at the power supply for the Gilmore Dyna series if you don't believe me. |
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Dec 10 2005, 02:19 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(arafat @ Dec 9 2005, 02:40 AM) wow..i'm impressed..good effort guys.. u guys are becoming sound engineer or what? never thought of going into that direction. sound engineering is a whole different field from electronics. most of those that have interest in this thread are either headphiles, or electronic savvy people. you could call this a 'hobby'.. |
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Dec 12 2005, 04:16 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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do this looks nice to you? wait till you see the backside of it.
  a complete mess. so 'unprofessional'. so i decided to forgo the original circuit and build a better looking one. what do you expect, the original circuit is more or less a testbed and i've soldered & desoldered the components quite a few time before finilazing it to something like this :  looks much better doesn't it?  don't let the macro shot fool you. the circuit is actually much smaller than it looks. the colourful wires are actually AWG28 & AWG30 which is about 0.3-0.4mm in size. i had to use precision tweezers to mount them. mounted into the case :      successfully build 3 of this.  |
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Dec 12 2005, 04:31 PM
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Senior Member
942 posts Joined: Jan 2003 From: hell
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nicely packed! doctor, what caps are you using?
i think my amp is going in the 'abandoned projects' dustbin... with my headphones rosak and all... |
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Dec 12 2005, 04:45 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(modD @ Dec 12 2005, 04:31 PM) nicely packed! doctor, what caps are you using? i think my amp is going in the 'abandoned projects' dustbin... with my headphones rosak and all... Pana FCs. i can't possibly fit in anything larger than those 1000uF 10V caps. and the decoupling caps are using polyester caps. polypropylene are too large. using 10V caps could be risky, but i don't have any other choice. Pana 16V caps are too large. i have a couple of those and they can't possibly fit. if the voltage divider don't give out, then it's perfectly fine. but if they decides not to work, then the caps will be blown. don't even mention Sanyo OSCONs/Muse, those are gigantic caps. for portability, something just had to give. |
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Dec 12 2005, 08:49 PM
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Staff
7,948 posts Joined: Jan 2005 From: Soviet Sarawak
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*edit ..................
This post has been edited by lucifah: Dec 12 2005, 08:50 PM |
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Dec 14 2005, 10:24 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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auw man.. they've changed the design yet again. damn..
 this would be like the 4th time. wahlauweh.. this time it's DC filament heating opposed to the original AC filament heating in the original schematics. seems that they're not gonna finalize the design anytime soon. |
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Dec 14 2005, 10:28 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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^ that would require somewhat a major change in my circuit since there's not enough space to bypass the 1N4002 & add the LM317 without making the circuit looking fugly.
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Dec 14 2005, 10:55 PM
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Senior Member
936 posts Joined: Jun 2005
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hey...thanks...actually what I was trying to ask was this. The Lm3886 at optimum would need +- 30V to operate properly. The +- 12V is just a baby amp for my friend. I'm building the full flying fish wasabi for myself. The thing is, I have no idea how to regulate +- 30V without building my own current fold-back regualtor from scratch (and that means from trans). I was hoping to know how ou guys regulate the voltage well enough at that level. +-12 is fine, cos that I can handle.
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Dec 16 2005, 03:58 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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gonna sell all of this :
PM me if you're interested. i have too many amps in my collection. there's 3 built amp selling for RM250 - RM300 up for grabs. and there's 3 more in development. |
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Jan 6 2006, 04:54 PM
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Senior Member
941 posts Joined: Nov 2005
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This thread is really awesome, i am new to this forum. Hi to everyone. BTW, alamaklor: I met you in Midi Specialist last year around October/November. I am Albert, do you still have any memory on that? I am playing guitar and DIY guitar effect.
Anyway, I am itchy to start a DIY Amp project as soon as I gather enough info and money. That would be after Chinese New Year probably. Thanks for all the knowledge you guys and girls share here. |
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Jan 7 2006, 01:11 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(wui223 @ Jan 6 2006, 05:54 AM) This thread is really awesome, i am new to this forum. Hi to everyone. BTW, alamaklor: I met you in Midi Specialist last year around October/November. I am Albert, do you still have any memory on that? I am playing guitar and DIY guitar effect. hi buddy, I left Msia last year around july back to Canada.....I doubt I've seen you before Anyway, I am itchy to start a DIY Amp project as soon as I gather enough info and money. That would be after Chinese New Year probably. Thanks for all the knowledge you guys and girls share here. |
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Jan 7 2006, 08:27 AM
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Senior Member
941 posts Joined: Nov 2005
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QUOTE(AlamakLor @ Jan 7 2006, 01:11 AM) hi buddy, I left Msia last year around july back to Canada.....I doubt I've seen you before Really?  Then i must have messed up the name already. I am still searching for that " Mystery Man ". |
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Jan 9 2006, 07:57 PM
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Senior Member
936 posts Joined: Jun 2005
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How do you guys normally regulate the power for your tube amps? as far as I know you guys usually operate at minimum +- 30V. How do you guys regulate that kind of power ?
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Jan 9 2006, 09:57 PM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(sakaic @ Jan 9 2006, 08:57 AM) How do you guys normally regulate the power for your tube amps? as far as I know you guys usually operate at minimum +- 30V. How do you guys regulate that kind of power ? tube works at +/- 30v?you can regulate it with LM317 if the current draw is low, lm 338 if current draw is > 5A. You can also build an opamp based tracking psu like the gilmore psu |
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Jan 9 2006, 10:52 PM
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Senior Member
936 posts Joined: Jun 2005
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Is it possible to use say a 7812 and we use it to differentially regulate the voltage through a transistor. My amp needs regulation and the current capcitor network used is no sufficient to filter out the plops from the mains. So I crippled my amp and ran on 7815 and 7915. the problem went away but not enough juice so need to go back to +-30. Currently using a pair of LM3886 to drive speakers.
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Jan 9 2006, 11:36 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(sakaic @ Jan 9 2006, 07:57 PM) How do you guys normally regulate the power for your tube amps? as far as I know you guys usually operate at minimum +- 30V. How do you guys regulate that kind of power ? most tube design uses a CRC filter to filter the B+ for the plate. since the B+ of the tube usually involves a high DC voltage, the LM series voltage regulator are quite unusable. QUOTE(AlamakLor @ Jan 9 2006, 09:57 PM) tube works at +/- 30v? you can regulate it with LM317 if the current draw is low, lm 338 if current draw is > 5A. You can also build an opamp based tracking psu like the gilmore psu tube works even down to +/- 4V (the lowest that i've tried). just that some might argue that it *might* have too much 2nd order distortion to make a sweet sound. and also, it might be against the law to operate the tube at that voltage. some tubes have a somewhat low maximum plate voltage, like the 6DJ8/6922 series where the maximum plate voltage is at around 110V and the nominal recomended plate voltage sits at 90V. though that would be considered as high, most users found that the tube still have a sweet sound at a relatively lower plate voltage of around 20V-40V. QUOTE(sakaic @ Jan 9 2006, 10:52 PM) Is it possible to use say a 7812 and we use it to differentially regulate the voltage through a transistor. My amp needs regulation and the current capcitor network used is no sufficient to filter out the plops from the mains. So I crippled my amp and ran on 7815 and 7915. the problem went away but not enough juice so need to go back to +-30. Currently using a pair of LM3886 to drive speakers. then why not try the LM317/LM337 pair to tweak the voltage to +/- 30V? if you read the datasheet, you'll see that the pair requires just two resistors to tweak the voltage to your desire. the formula for doing just that is also included in the datasheet. |
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Jan 10 2006, 01:00 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(sakaic @ Jan 9 2006, 11:52 AM) Is it possible to use say a 7812 and we use it to differentially regulate the voltage through a transistor. My amp needs regulation and the current capcitor network used is no sufficient to filter out the plops from the mains. So I crippled my amp and ran on 7815 and 7915. the problem went away but not enough juice so need to go back to +-30. Currently using a pair of LM3886 to drive speakers. not enough juice....most VR can output any voltage you set to it...the only limited juice is current which is limited by the VR and thermal regulation (LM317 vs LM338). I've not used the 7812 or the likes before and is lazy to look into the datasheet, if it's "voltage" that is insufficient (too low Vout), you might wanna check the datasheet as they would tell you how to set the Vout to your desired #.btw, "pop" gets louder when there are more capacitance since the capacitors draw sh1t loads of current and cause a quick surge when you turn on the speaker. Current limiter may fix the problem....but then...what's the point of having so many caps when you're gonna limit the current right dun worry about it....they wont screw up anything. You can always put the amp into standby mode (capacitors already been fed) and that way you won't kena pops when you turn on your amp...unless u are talking about pops when you turn on switches (lamps and etc) which is connected to the same route....well...get a dedicated line for audio share nothing with other stuff |
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Jan 10 2006, 06:32 AM
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Senior Member
941 posts Joined: Nov 2005
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I have a guitar amp which will "pop" each time i switch it on or off. Anyway to get rid of the "pop" sound? I heard that some better design amp can eliminate the "pop". How to do it ? Thanks
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Jan 10 2006, 07:29 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(wui223 @ Jan 9 2006, 07:32 PM) I have a guitar amp which will "pop" each time i switch it on or off. Anyway to get rid of the "pop" sound? I heard that some better design amp can eliminate the "pop". How to do it ? Thanks low capacitance amp will pop softer. A current limiter would also reduce the pop. A time delay turn-on circuit could also eliminate the pop. The driver is hardwired to the amp so there is really nothing much u can do unless you put a switch on the amp signal out, break the connection, turn on the power, then only turn on the switch. in a headphone amp application, I always turn on my amp before I plug in my phone....it reduces the jack's lifespan but doesn't make me worry one bit about the current surge. Anyway, dun worry about it....the designers aren't dumb, and a short surge like that wouldn't do much (if any) harm to the driver. |
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Jan 10 2006, 09:31 PM
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Senior Member
1,896 posts Joined: Jan 2003 From: Subang Jaya
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Disclaimer: The views below are purely my own and subjective. They are my opinions and should be taken as such.
Some impressions on thedoctor's simple class AB amps... Received 2 units class AB amps for audition purposes which was DIYed by thedoctor a while back. First one is with TL072 opamp + normal caps and another one comes with OPA2134PA opamp + ALPS log pot. To simplify the naming, I will use their opamp name as their *ID to avoid confusion. The following comments are drawn from a relative point of view with the PA2v2 thrown in the comparison using the same setup. Headphones used: Grado HF-1 Sennheiser HD600 Test Source (Apple Lossless): The Best Of Brad Prevedoros Trace Bundy - Adapt James Blunt - Back to Bedlam Kylie Minogue - Body Language Other equipments/accessories used: 5G iPod 30GB PocketDock Cardas HPI mini-mini PA2v2  More photos: » Click to show Spoiler - click again to hide... « Sonic characteristics *OPA2134 on HD600: HD600 is well known for its laid-back signature. Once I plugged it in OPA2134, I was very surprised that it boosted the highs and made it a bit grado-like sounding. That said the 'veil' from Senn is now became brighter IMHO. Yet the brightness is still far lesser compare to HF-1. The improvement of the sound is not that obvious, but it's noticeable. In short, it refined the highs of HD600. I played them with Brad Prevedoros and I must admit that I've never enjoyed classical guitar so deeply before with my previous setup until I met this AB amp + HD600 combo. The refinement also noticeable in the instrument separation and the soundstaging. The excellent presentation of depth and width of HD600 excel a little further with the aid of AB amp. *OPA2134 on HF-1: To test on HF-1, I played them with Kylie Minogue songs. Unamped HF-1 gives very less bass extension, the lows mostly comes from midbass. This finding was apparent when I switched b/w HD600 for the same song (HD600 has deeper bass in the sense). And when I paired HF-1 with OPA2134, the bass ext. has got minor improvement, and I heard a little more punchier bass than unamped. The highs on HF-1 is still very bright, but the details are brought to another level of 'high-end' clarity. *TL072 on HD600: Before I received the amps, thedoctor told me that this amp has very smooth sounding compare to OPA2134. HD600 vocal is very dried to me, in another words, it's boring IMO. I was expected this amp could reveal the midrange of HD600, and yes it does, and did it well. When played with James Blunt - You're Beautiful, I could clearly heard every single words that he sings in very smooth behavior. And most importantly, it is not as dull as unamped. I could barely notice any improvement in bass department. This amp is not as aggressive as OPA2134 IMHO. *TL072 on HF-1: I was hoping that this amp will tame the highs on HF-1 due to its smooth sounding characteristic. But it seems that TL072 is not able to stop the harshness, too. Well, I didn't take very critical listening on this amp with HF-1. As the amp can take only normal batt, I wanted to save the batt life for my listening pleasure with HD600 + OPA2134 on classicals .Some notes on PA2v2: Initially the PA2v2 to me is only a volume gain booster. Then I posted some impressions on sgheadphones.net about this finding. Some gosu there told me that things that can't see or hear doesn't mean it ain't there. It takes skills and experience in discerning sound, as in all hobbies of appreciation eg. wine, food, car, etc. Oh well, I took further listening on it and compared with AB amps. Maybe I'm not skillful enough, the step up of PA2v2 in terms of SQ isn't that great IMHO. YMMV. Conclusion: If I'm not mistaken thedoctor is selling these AB amps @RM250 or so. Compare with RM220 PA2v2, the price of AB amps is a steal. Bare in mind these are portable amps, so in most of my views above were included 'little', 'a bit improvement' because it really take some critical listening in order to define the refinement of these amps. That said headphone amp will not change the sound signature of a headphones, so don't expect a day and night difference with entry level amp. Last but not least, AB amp is best bang for the bucks for budget portable users. For the same amount of cash, you might be able to get only a CMOY from ebay, but this AB amp is One level superior than CMOY. So spend your hard-earned cash wisely if you are looking for a portable amp. Notes: The current AB amps can take only normal batt, hope that thedoctor will develop newer amps that take rechargebles and better still, AC adaptor. Credentials: Thanks thedoctor for the AB amps for testing. Medufsaid for the HD600 and Shogun for the PA2v2. This post has been edited by Futura: Jan 11 2006, 12:18 AM |
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Jan 10 2006, 09:42 PM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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QUOTE Some notes on PA2v2: Initially the PA2v2 to me is only a volume gain booster. Then I posted some impressions on sgheadphones.net about this finding. Some gosu there told me that things that can't see or hear doesn't mean it ain't there. It takes skills and experience in discerning sound, as in all hobbies of appreciation eg. wine, food, car, etc. Oh well, I took further listening on it and compared with AB amps. Maybe I'm not skillful enough, the step up of PA2v2 in terms of SQ isn't that great IMHO. YMMV. That's the point. You have to playing around your source volume and the PA2V2 volume to make it sounds good. RM222 come with life time warraty (yes life time warranty from Gary) and insance long battery life with a pair NIMHA 2100mAh (for my setup around 1 week on and never off). It's already best performance make it outstanding than others. |
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Jan 10 2006, 10:36 PM
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Senior Member
936 posts Joined: Jun 2005
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The voltage is ok but the current is insufficient. The amp power source bottoms out when I have very powerful vocals blaring through the speakers and the amps clip.
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Jan 10 2006, 10:42 PM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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QUOTE(sakaic @ Jan 10 2006, 10:36 PM) The voltage is ok but the current is insufficient. The amp power source bottoms out when I have very powerful vocals blaring through the speakers and the amps clip. You won't find clipping with PA2V2, the volume so loud that you want to take off your phone immediately. |
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Jan 11 2006, 02:21 AM
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Senior Member
936 posts Joined: Jun 2005
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sorry....its not your article that I'm talking about its the answer from alamaklor and thedoctor about my amp.
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Jan 11 2006, 04:03 AM
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Senior Member
2,503 posts Joined: Jan 2003 From: http://davis-online-store.com
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Huhh... safe. Leganya.
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Jan 11 2006, 06:50 AM
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Elite
9,856 posts Joined: Jan 2003 From: Kuala Lumpur, WP
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QUOTE(sakaic @ Jan 10 2006, 11:36 AM) The voltage is ok but the current is insufficient. The amp power source bottoms out when I have very powerful vocals blaring through the speakers and the amps clip. actually, when an amp clips, it can be due to current/voltage as they both "swing" but usually it is the voltage's fault. If you are convinced that it is current that is lacking, as I mentioned ealier which is the real juice one should concern, get yourself a higher current output regulator. Again, there is virtually no cure for the turn-on pops with high current output/high capacitance amplifier, other than those solutions I mentioned earlier. There may be some that I did not capture, but you get the idea.Do give the LM338 a check, they are about RM10 each I believe, with an output current of around 5A....if you need more juice...u've gotta start looking for something else. I've only used LM317 and LM338 VRs since they are rather cheap and works very well |
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Jan 11 2006, 06:50 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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any1 diy small portable tube based (hybrid) headphone amp b4?
especially powered using 9v batery by sijosae 9V Hybrid (6922 + TDA1308)  where can find the scheme n component? |
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Jan 11 2006, 09:42 AM
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Senior Member
677 posts Joined: May 2005 From: 1s and 0s
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QUOTE(yeah_guyz @ Jan 11 2006, 06:50 AM) any1 diy small portable tube based (hybrid) headphone amp b4? w00t! This thing looks intresting especially powered using 9v batery by sijosae 9V Hybrid (6922 + TDA1308) where can find the scheme n component? |
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Jan 11 2006, 05:11 PM
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Senior Member
2,864 posts Joined: Jan 2005
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QUOTE *OPA2134 on HD600: HD600 is well known for its laid-back signature. Once I plugged it in OPA2134, I was very surprised that it boosted the highs and made it a bit grado-like sounding. That said the 'veil' from Senn is now became brighter IMHO. Yet the brightness is still far lesser compare to HF-1. The improvement of the sound is not that obvious, but it's noticeable. In short, it refined the highs of HD600. I played them with Brad Prevedoros and I must admit that I've never enjoyed classical guitar so deeply before with my previous setup until I met this AB amp + HD600 combo. The refinement also noticeable in the instrument separation and the soundstaging. The excellent presentation of depth and width of HD600 excel a little further with the aid of AB amp. Strange, the OPA2134 is quite laidback for me and warm and lacking in detail for me (at least when compared to the AD823) |
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Jan 11 2006, 07:42 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(yeah_guyz @ Jan 11 2006, 06:50 AM) any1 diy small portable tube based (hybrid) headphone amp b4? especially powered using 9v batery by sijosae 9V Hybrid (6922 + TDA1308) where can find the scheme n component? QUOTE(Categg @ Jan 11 2006, 09:42 AM) w00t! This thing looks intresting the amp is actually a 9V Hybrid amp utilizing a tube gain stage and a OpAmp buffer stage. the TDA1308 chip could be replaced with any other dual Op-Amps like the OPA2134/2207/2134 or even a high current buffer like the OPA634/OPA551. yes, it could possibly be powered by a single 9V battery since the heating element of the 6922 requires only 6.3V, but the current drain should prove deadly. the heater itself requires more than 350mA of current and that should last you about a few hours (possibly less than 6 hours) of playback before you need to swap a new battery in. but if you need a portable tube amp anyway, i should suggest finding a better suited tube for the purpose. there are some Russion tubes that operates at much lower filament voltage and current than the 6922 (some as low as 1.5V/less than 2mA of current). that should last you a lot longer than the 6922. the problem is, those tubes aren't easily to locate as it's rarely used in any amps. but if you could get your hands on it, then two of those with a diamond buffer should be a killer portable amp. there's something better than the 9V hybrid amp you posted. the iHybrid Nano with the 555 voltage inverter should arguably give the best sound you could get from a portable tube amp. pics and schematic as below :   |
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Jan 11 2006, 07:56 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(Tachikoma @ Jan 11 2006, 05:11 PM) Strange, the OPA2134 is quite laidback for me and warm and lacking in detail for me (at least when compared to the AD823)is the AD823 driving the output by itself? you're referring to the Dr.Head amp being swapped with an AD823 or other headamps that have separated OpAmp gain stage and a discreet buffering stage? the OPA2134 sounds bright with the AD8066 being painfully bright in the Class AB since the OpAmp isn't driving the output by itself. since the gain stage and driving stage are separated, the current rating on the OpAmp output won't have a significant effect on the final output. separating the buffer stage from the gain stage releives the chip from strain, allowing the chip to work in a much better situation, and thus even a TL072 sounds 'acceptable'. and also, since there's a discreet buffer stage, component pair on the buffer stage does have a significant impact on the sound. different transistors will give a different sound at the output. on my ears, the TL072 sounds the best from all the chips that i've tried on the Class AB. even the OPA2134 is too bright to my liking. but that might be because of the modded EMU0404 that i'm using. the 0404 is modded up to a point that it's very transparent and a laid back amp compliments my setup better. |
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Jan 11 2006, 08:50 PM
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Senior Member
2,864 posts Joined: Jan 2005
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QUOTE is the AD823 driving the output by itself? you're referring to the Dr.Head amp being swapped with an AD823 or other headamps that have separated OpAmp gain stage and a discreet buffering stage? Yeup, I meant the AD823 with my ex-headphone amp >_> |
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Jan 11 2006, 09:13 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(Tachikoma @ Jan 11 2006, 08:50 PM) Yeup, I meant the AD823 with my ex-headphone amp >_> then i guess the aggressiveness of the AD823 would be a better pair for the Dr.Head. the AD823 is said to be even brighter than the AD8066, which in my ears are 'unbearable'. so the AD823 on the Class AB would yield more or less the same result as the AD8066. tangent did a brief comparison on some OpAmp chips and you could read about it here. |
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Jan 11 2006, 09:25 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(thedoctor @ Jan 11 2006, 07:42 PM) the amp is actually a 9V Hybrid amp utilizing a tube gain stage and a OpAmp buffer stage. the TDA1308 chip could be replaced with any other dual Op-Amps like the OPA2134/2207/2134 or even a high current buffer like the OPA634/OPA551. yaya...yes, it could possibly be powered by a single 9V battery since the heating element of the 6922 requires only 6.3V, but the current drain should prove deadly. the heater itself requires more than 350mA of current and that should last you about a few hours (possibly less than 6 hours) of playback before you need to swap a new battery in. but if you need a portable tube amp anyway, i should suggest finding a better suited tube for the purpose. there are some Russion tubes that operates at much lower filament voltage and current than the 6922 (some as low as 1.5V/less than 2mA of current). that should last you a lot longer than the 6922. the problem is, those tubes aren't easily to locate as it's rarely used in any amps. but if you could get your hands on it, then two of those with a diamond buffer should be a killer portable amp. there's something better than the 9V hybrid amp you posted. the iHybrid Nano with the 555 voltage inverter should arguably give the best sound you could get from a portable tube amp. i knw iHybrid Nano, but can it using 9v battry to powered? i m quite noob in those thing hw much for the iHybrid Nano and 9V Hybrid (6922 + TDA1308) will costed? newbie in amp confusing whether go for cmoy or tube amp (if hv $$ sure both ) |
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Jan 11 2006, 11:06 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(yeah_guyz @ Jan 11 2006, 09:25 PM) yaya... i knw iHybrid Nano, but can it using 9v battry to powered? i m quite noob in those thing hw much for the iHybrid Nano and 9V Hybrid (6922 + TDA1308) will costed? newbie in amp confusing whether go for cmoy or tube amp (if hv $$ sure both )the iHybrid Nano would be the best choice if you wanna drive it using a battery. and yes, it could be driven by a single battery. the parts shouldn't cost too much, but the tubes are quite hard to find. i strongly advice you to build yourself a CMOY first before venturing into tubes. that would give you better experience and knowledge before messing with even more complex designs. might i suggest something a level higher than the iHybrid Nano? something like the YAHA should sound better than the iHybrid and costs just about the same. you wouldn't have to worry about swapping batteries all too often since it runs on DC power. might not be portable though. but i'd rather stick to a non-portable design if i were to use tubes. |
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Jan 11 2006, 11:10 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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[update on the SOHA design]
they've changed the design yet again! now it comes with a Mu Follower since all the design before this gives out too much DC offset (close to 100mV).  for those that didn't build the SOHA yet, i strongly advice you guys to wait for a final design. now i gotta go and revamp my amp (yet again). |
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Jan 12 2006, 11:12 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(thedoctor @ Jan 11 2006, 11:06 PM) thec would be the best choice if you wanna drive it using a battery. and yes, it could be driven by a single battery. so hw much budget need to bulit iHybrid Nano?the parts shouldn't cost too much, but the tubes are quite hard to find. i strongly advice you to build yourself a CMOY first before venturing into tubes. that would give you better experience and knowledge before messing with even more complex designs. might i suggest something a level higher than the iHybrid Nano? something like the YAHA should sound better than the iHybrid and costs just about the same. you wouldn't have to worry about swapping batteries all too often since it runs on DC power. might not be portable though. but i'd rather stick to a non-portable design if i were to use tubes. can i find those tube in kl? YAHA?no idea with this amp.......noob SOHA?? |
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Jan 13 2006, 01:51 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(yeah_guyz @ Jan 12 2006, 11:12 PM) so hw much budget need to bulit iHybrid Nano? for the iHybrid Nano that uses 6111 tubes, i have no idea on the availability. but a 6822/6DJ8/12AU7/12AX7 used on the YAHA should be easier to find.can i find those tube in kl? YAHA?no idea with this amp.......noob SOHA?? compared to a SOHA, the YAHA should be easier to build, but rated below the SOHA in sound reproduction. |
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Jan 14 2006, 01:29 AM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(thedoctor @ Jan 13 2006, 01:51 AM) for the iHybrid Nano that uses 6111 tubes, i have no idea on the availability. but a 6822/6DJ8/12AU7/12AX7 used on the YAHA should be easier to find. emm compared to a SOHA, the YAHA should be easier to build, but rated below the SOHA in sound reproduction.   this 1 ok kua... wanna ask is it using wall adapter and battery to power it? wat i mean is when for portable use can use battery then can use wall adapter when at home (sorry for my broken english )This post has been edited by yeah_guyz: Jan 14 2006, 01:41 AM |
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Jan 14 2006, 06:50 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(yeah_guyz @ Jan 14 2006, 01:29 AM) emm wanna ask is it using wall adapter and battery to power it? wat i mean is when for portable use can use battery then can use wall adapter when at home (sorry for my broken english )the 12V YAHA variant runs on 12V DC power. meaning it requires a 12V power supply for it to operate. the 9V battery is there to increase the plate voltage of the tube. sijosae believes that a higher plate voltage does make an improvement in sound reproduction as it makes the tube operate with better linearity. that amp can't run on batteries alone. and thus it's not portable. |
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Jan 14 2006, 07:29 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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QUOTE(thedoctor @ Jan 14 2006, 06:50 PM) the 12V YAHA variant runs on 12V DC power. meaning it requires a 12V power supply for it to operate. the 9V battery is there to increase the plate voltage of the tube. sijosae believes that a higher plate voltage does make an improvement in sound reproduction as it makes the tube operate with better linearity. onoo.... that amp can't run on batteries alone. and thus it's not portable.  so hard to find the 9v portable YAHA amp... any recommendation |
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Jan 14 2006, 07:52 PM
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Senior Member
3,980 posts Joined: Oct 2005 From: HeAv3N
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emm
doctor is it cmoy same with class AB amp?? do u hv any circuit diagram and full component list for AB amp or cmoy? can post to me?? my budget is below RM100 can powered by using battery and DC (portable) if using 2x9v battery, instead of increase voltage, wat else wil improve?quality? thanks alot |
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Jan 14 2006, 10:31 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(yeah_guyz @ Jan 14 2006, 07:29 PM) onoo.... so hard to find the 9v portable YAHA amp... any recommendation as far as i'm concerned, there's no portable tube amp available yet on the market. guess there's none and there'll be none. i myself can't get a hold off any 'pencil tube' that could be powered from a battery though those would be very interesting to try out. for portability, i do think that a chip (Opamp) based amp should be better with much better efficiency than a tube amp. QUOTE(yeah_guyz @ Jan 14 2006, 07:52 PM) emm doctor is it cmoy same with class AB amp?? do u hv any circuit diagram and full component list for AB amp or cmoy? can post to me?? my budget is below RM100 can powered by using battery and DC (portable) if using 2x9v battery, instead of increase voltage, wat else wil improve?quality? thanks alot the class AB amp? those are a step up from a CMOY. it's a buffered amp which i don't really suggest unless you have proper experience working with a CMOY before this. i do think that i've posted the full schematics for the Class AB amp somewhere in this thread before, seek a couple of pages back. for the CMOY, you could refer here. for RM100, i do think that you should try the CMOY first. getting components for the CMOY is harder than you think. and if you're thinking of powering the amp from a battery and a DC adapter, i suggest that you build a filtering circuit since AC lines tend to be noisy and induce lots of ripples into the amp. the TREAD comes highly recomended. my suggestion : DIY a CMOY before venturing further. the components itself might be a trouble get a hold off. forget about the TREAD/DC power for the time being, just try and run it from a battery first. [edited: typos] This post has been edited by thedoctor: Jan 14 2006, 10:38 PM |
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Jan 15 2006, 06:05 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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fancy a power amp?
QUOTE What is a Gainclone? A GainClone is a clone of a product called the "GainCard", made by 47-Labs. This "GainCard" cost USD$4000 for the Amplifier and USD$1800 for the power supply. They have VERY few components and are based on the National Semiconductor LM3875 IC. If you want to know more about the Gainclone just google as they are VERY popular and there is heaps of info on the internet about them. you wouldn't believe how simple the design is. link 1 link 2 link 3 |
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Jan 15 2006, 08:11 PM
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Senior Member
2,864 posts Joined: Jan 2005
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yes, I do :0
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Jan 15 2006, 10:16 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(Tachikoma @ Jan 15 2006, 08:11 PM) yes, I do :0 why not build one? it's so simple that people do it point-to-point soldering. heck, you don't even need a solder to do point-to-point wiring. |
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Jan 16 2006, 10:43 AM
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Junior Member
451 posts Joined: Oct 2005
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Consider this my application to join the DIY club.
Since I am only just re-embarking on this wonderful world of DIY audio, I do not have any completed projects to post here. I have just orderd the PCBs I need for my project, so they should be here in about 2 weeks time. But I do need some information on sourcing components. Where can I find 2000VA to 3000VA toroidal transformers (Need 2) and air core inductors (Need 4). I have searched both RS and Farnell, even emailed them but they do not have them. Before I go walking blindly into Jalan Pasar, I would appreciate anyone pointing me in the right direction .... preferably in Klang Valley. This post has been edited by jasonlky: Jan 16 2006, 10:51 AM |
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Jan 16 2006, 02:09 PM
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Junior Member
279 posts Joined: Jan 2003
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QUOTE(jasonlky @ Jan 16 2006, 10:43 AM) Where can I find 2000VA to 3000VA toroidal transformers (Need 2) and air core inductors (Need 4). I have searched both RS and Farnell, even emailed them but they do not have them. Before I go walking blindly into Jalan Pasar, I would appreciate anyone pointing me in the right direction .... preferably in Klang Valley. 1) you might have to either wind them yourself ( you'll need an lcr meter for this - just to be more accurate ) -- and trust me it's not easy as it looks especially if you get a thicker wire. ( magnet wires available from lots of places -- some hardware shops, some electronic shops -- you just have to look around) 2) find some ready made from jalan pasar -- but you'll also need an lcr meter for this since the shops rarely provide you with the exact values and most of them does not know the values (you'll also need to search high and low for shops selling these at jalan pasar ) 3) find some car audio shops that would help wind them for you ( one shop available in kepong -- but I dont think they're providing the service anymore since they broke thier meter). Kf audio might be able to help -- they have the meter there but I'm not sure if any of the workers there are willing to help wind them for you. 4) purchase from octave electronics -- which should cost you a bomb since they only have the expensive foil type air cored inductors (but should sound great -- depend s on application )5) err last option that I know -- order it from the net ( you can find some specialised shops from neighbouring countries or maybe you could try http://www.madisound.com/ ) for transformers there are lotsa option but you can try asking in diyforums yahoo groups -- people there should know, infact some of the guys here are from there.. so maybe wait for some of them to reply *wink *wink |
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Jan 16 2006, 03:14 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(jasonlky @ Jan 16 2006, 10:43 AM) Consider this my application to join the DIY club. Since I am only just re-embarking on this wonderful world of DIY audio, I do not have any completed projects to post here. I have just orderd the PCBs I need for my project, so they should be here in about 2 weeks time. But I do need some information on sourcing components. Where can I find 2000VA to 3000VA toroidal transformers (Need 2) and air core inductors (Need 4). I have searched both RS and Farnell, even emailed them but they do not have them. Before I go walking blindly into Jalan Pasar, I would appreciate anyone pointing me in the right direction .... preferably in Klang Valley. i don't think you could find toroidal transformers with that kind of voltage over at RS/Farnell. at least i've never stumbled upon them. for that kind of voltage, you have to wind them yourself. can't you use the normal iron transformer? that should be easier to DIY. as for air core inductors; if i recall correctly, DIYParadise does sells them, for the Charlize. he did mention that it's custom made. try emailing yeo@diyparadise.com, maybe he could help you out. |
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Jan 16 2006, 04:12 PM
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Junior Member
451 posts Joined: Oct 2005
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QUOTE(thedoctor @ Jan 16 2006, 03:14 PM) i don't think you could find toroidal transformers with that kind of voltage over at RS/Farnell. at least i've never stumbled upon them. for that kind of voltage, you have to wind them yourself. I am building a 200W single ended class A solid state power amp (its a man thing). The toroidal transformer gives the best power to weigh and size ratio.... and as u can see i need big power!! I have not found any definitve online retailers with this kind of power rating for our 240v input voltages. Dun want to wind the transformer myself.... anyone volunteer to wind for me. I'd pay for time and materials. This is serious.... PM me if interested. can't you use the normal iron transformer? that should be easier to DIY. as for air core inductors; if i recall correctly, DIYParadise does sells them, for the Charlize. he did mention that it's custom made. try emailing yeo@diyparadise.com, maybe he could help you out. As for air core inductors, I have found many sites and have decided on the pure copper foil type inductor, said to reduce the "skin" effect. Not too expensive USD20 each for an inductance rating of 2.2mH, 14/16 gauge. |
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Jan 19 2006, 06:20 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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a tour in 'Restricted' section at one of the shops today leads to some interesting findings. it seems there's a shop over here that stocks Audio grade caps. and lots of it too!
there's 2 racks filled with ELNA Audio Grade caps; various Panasonic caps, including some bearing Kenwood/Technics Audio grade; MALLORY caps, SPRAGUE caps, Rubycon, Nichicon, Nippon Chemi-Con and lots more from various series. some comes with as high as 400V rating, just nice for tube application. most are old stocks (i think), but i did find some Pana FC, HFQ and some Pana Long Life series in there. so it can't only be old stocks in there since Pana FCs are quite a new model. i just can't believe that they hold SPRAGUE and MALLORY caps also. that's quite a surprise! bought one 3900uF/63V ELNA Audio Grade caps bearing ELNA Japan wording and one 1500uF/50V MALLORY caps just for testing. will be replacing the MAXCAP caps that i'm using in my 24V regulated supply for the YAHA. hopefully those caps are not fakes. if those gives good result, then i guess some MALLORY caps here and there in both the SOHA and YAHA should be just nice. also, they stock lots of Polypropylenes from various manufacturers. found lots of Phillips MKP series and some from i-don't-know-which-manufacturer MKP caps. there's also some Panasonic MKP and MKT (Polyester) and some EVOX RIFA MKT caps. all in all, lots more choices there compared to both Farnell/RS. |
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Jan 19 2006, 06:23 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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^ for those interested, have a look over at Guo-Wa Sdn. Bhd.
their shop is located at Taman Seri Tebrau. you would have to ask for permission to take a look in Restricted section. ask them to lead you to the capacitor rack. |
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Jan 19 2006, 11:02 PM
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Senior Member
975 posts Joined: Sep 2004 From: Setapak
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i wish at kl has that type of shops..enough to octave..keke.
This post has been edited by rioven: Jan 19 2006, 11:03 PM |
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Jan 20 2006, 02:08 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(rioven @ Jan 19 2006, 11:02 PM) i wish at kl has that type of shops..enough to octave..keke. don't they? i thought KL have more choices compared to over here in JB. |
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Jan 20 2006, 07:31 AM
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Senior Member
563 posts Joined: Jan 2003
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wow, doctor.. looks like you found the treasure box !
KL .... the problem is donno which shop, there are so many of them. i tried a few shops but couldnt find any quality caps, gonna go again later. any found quality stuff do share with us pls hhmm ... should we make a list ? where to get what for DIYers. AHhaha This post has been edited by blah1134: Jan 20 2006, 07:35 AM |
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Jan 20 2006, 08:57 AM
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Senior Member
975 posts Joined: Sep 2004 From: Setapak
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let me start 1st...(caps)
1. octave electronics (PJ) 2. millennium hifi & av (plaza damas & taman baru skudai) |
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Jan 25 2006, 11:38 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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i just had to say something about the SOHA since i've completed the building process.
single word : awesome! beats the YAHA in all category. ok, maybe the bass is a bit tighter on the YAHA since i've implemented a diamond buffer in that thing; but still details, depth, soundstage, warmth improved a lot compared to the YAHA. i'm very satisfied with the SOHA. and i do think the two other people that got the SOHA will be satisfied with their unit too. build this if you can DIY, beats the hell out of the YAHA. would be very nice if i could compare this amp with some other tube amps available. i just might tag along in the next gathering, bringing the basic SOHA, the maxed-out YAHA, and a maxed-out SOHA that i'm currently working on. a tubeamp shootout in the next gathering with the Little Dot 3, SOHA, YAHA, and maybe the acclaimed Musical Fidelity X-Can would be very interesting. |
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Jan 25 2006, 11:46 PM
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Senior Member
2,864 posts Joined: Jan 2005
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Lol, gather in Johor?
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Jan 26 2006, 01:09 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(Tachikoma @ Jan 25 2006, 11:46 PM) Lol, gather in Johor? naah. let's make it in KL. i'm really interested to hear the GainClone with a bookshelf.^ a valve buffered inverted gainclone to be exact. threads here and here. finally, a hybrid amp that could drive headphones (pre-out) and speakers (power-out). i'm currently trying to implement something like the SOHA as the pre-amp and the inverted gainclone as the power-amp. ^ that would give the best out of both worlds. both headphones and speakers from a single integrated amp. |
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Jan 27 2006, 03:10 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(runeight) Yes indeed, I believe these numbers. The buf634 has a comparatively lower input impedance and I am not surprised that it has worse distortion figures than the PPA buffer. The PPA buffer makes lighter current demands on the tube as best I can see. Nearly all of these buffers would do fine if being driven by sand, but they are not all equal when driven from the plate of a tube running at 1/2mA. Thanks for the link. Very nice to know. In fact, I'm working on another hybrid that will be using the PPA buffer now that the SOHA seems to be working so well. quoted from here. an improved SOHA. with a Class A Diamond Buffer! that should be verry interesting. |
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Jan 28 2006, 02:35 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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where is everybody? not much activity in here lately..
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Jan 28 2006, 03:55 PM
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Senior Member
941 posts Joined: Nov 2005
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QUOTE(thedoctor @ Jan 28 2006, 02:35 AM) where is everybody? not much activity in here lately.. Could i join u the gathering ? Although i dun have any amp to share with, but i am interested to hear the audio amps you guys have been discussing all these while. Perhaps i could make myself an amplifier this year. |
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Jan 28 2006, 05:31 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(wui223 @ Jan 28 2006, 03:55 PM) Could i join u the gathering ? Although i dun have any amp to share with, but i am interested to hear the audio amps you guys have been discussing all these while. Perhaps i could make myself an amplifier this year. sure, why not. but there's no date yet, but i'm guessing somewhile after the guys got their LD3. |
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Jan 28 2006, 08:56 PM
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Senior Member
941 posts Joined: Nov 2005
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Happy to hear that, i will check this post from time to time to ensure i wont miss this golden oppurtunity. BTW, what is LD3 ?
theDoctor: U like Dream Theater and liquid tension experiment ? |
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Jan 28 2006, 10:30 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(wui223 @ Jan 28 2006, 08:56 PM) Happy to hear that, i will check this post from time to time to ensure i wont miss this golden oppurtunity. BTW, what is LD3 ? LD3 is Little Dot 3; an all tube headamp from China that the guys are bulking. the bulk thread here. one of the guys already have it in his hands.theDoctor: U like Dream Theater and liquid tension experiment ? yes, Dream Theater and Liquid Tension is one my favs. listen to them a lot. |
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Jan 30 2006, 08:48 AM
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Senior Member
941 posts Joined: Nov 2005
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QUOTE(thedoctor @ Jan 28 2006, 10:30 PM) LD3 is Little Dot 3; an all tube headamp from China that the guys are bulking. the bulk thread here. one of the guys already have it in his hands. I wonder will my eardrums bursting if i listen to DT and Liquid Tension Experiment with you guys' headphone amplifiers and headphones. yes, Dream Theater and Liquid Tension is one my favs. listen to them a lot. |
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Jan 30 2006, 01:36 PM
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Senior Member
8,046 posts Joined: Jan 2003
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QUOTE(wui223 @ Jan 30 2006, 08:48 AM) I wonder will my eardrums bursting if i listen to DT and Liquid Tension Experiment with you guys' headphone amplifiers and headphones. Eardrums are tough little membranes but don't push it!..as with any music, just be moderate for comfortability and not too loud. Amps and headphones are repairable/replaceble but eardrums are not entirely. |
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Jan 30 2006, 02:23 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(wui223 @ Jan 30 2006, 08:48 AM) I wonder will my eardrums bursting if i listen to DT and Liquid Tension Experiment with you guys' headphone amplifiers and headphones. i don't put the volume too high when playing music. just enough for a comfortable listening pleasure.headamps aren't supposed to just make the volume louder. headamps is to make sure that the headphones have all the current that it needs to perform at its best. |
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Jan 30 2006, 03:43 PM
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Senior Member
941 posts Joined: Nov 2005
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I got the point now. At least i wont feel scared when i listen to headphone later. Currently i am using an old SONY hifi set which my father bought 10+ years ago. I dun really like my cheapo headphone which i use at another PC coz my head is big and i am not comfortable with it.
Looking forward for u guys' gathering, i am just afraid i will be another HeadAmp addict. :? |
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Jan 30 2006, 04:13 PM
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Senior Member
945 posts Joined: Mar 2005
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QUOTE(wui223 @ Jan 30 2006, 03:43 PM) I got the point now. At least i wont feel scared when i listen to headphone later. Currently i am using an old SONY hifi set which my father bought 10+ years ago. I dun really like my cheapo headphone which i use at another PC coz my head is big and i am not comfortable with it. Peoples are still waiting for new gadgets to arrive. Looking forward for u guys' gathering, i am just afraid i will be another HeadAmp addict. :? , not sure when's the gathering. But it definitely an upgrade. Some of the forumers attended last time have bought high end headphones. So stay tune. Be warned first, dun get poisoned.This post has been edited by airbag_grado: Jan 30 2006, 04:14 PM |
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Jan 30 2006, 09:13 PM
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Senior Member
941 posts Joined: Nov 2005
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I gotta start collecting Ang Pau money soon.
I will try my best to squeeze my time to join the gathering, it might be once in a lifetime chance for me. |
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Jan 30 2006, 09:31 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(airbag_grado @ Jan 30 2006, 04:13 PM) Peoples are still waiting for new gadgets to arrive. hopefully the wait won't take too long.. , not sure when's the gathering. But it definitely an upgrade. Some of the forumers attended last time have bought high end headphones. So stay tune. Be warned first, dun get poisoned. QUOTE(wui223 @ Jan 30 2006, 09:13 PM) I gotta start collecting Ang Pau money soon. yeah, come along. this time there'll be even more gadgets to try on.. even more poisonous than the last gathering. I will try my best to squeeze my time to join the gathering, it might be once in a lifetime chance for me. |
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Jan 31 2006, 01:56 AM
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Senior Member
1,359 posts Joined: Jan 2003 From: Ipoh
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Maybe it's abit off topic over here, could anyone of here recommend me a solid state power amp ranging around RM2k? The GainClone that's hyping around you guys sound like a interesting one, anyone DIY it before? Sorry if I bother you guys alot, thanks ya
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Jan 31 2006, 02:47 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(GodLuvSxS @ Jan 31 2006, 01:56 AM) Maybe it's abit off topic over here, could anyone of here recommend me a solid state power amp ranging around RM2k? The GainClone that's hyping around you guys sound like a interesting one, anyone DIY it before? Sorry if I bother you guys alot, thanks ya i'm trying to build one. but not the original version of the GainClone. the original design is too easy. anyway, i've got most of the ingredients already in my hands, except for some high amperage transformers needed. have no idea whether the electronic shops would open tomorrow or not. the main ingredients, the raved LM3886T chip :  ^ well maybe too much since i only need 2 of those for an amp. the price? Farnell sells one for RM25 a piece, while RS quotes me at RM30 a piece. let's just say i got those at a wayyyy cheaper price. caution though, the design involves high DC voltage (about 70V) and a high amperage current (more than 2Amps). high DC voltage + high amperage = a definite no-no for first timers. |
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Jan 31 2006, 02:55 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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^ er, no. i'm not kidding.
not to discourage those highly interested, but anything above 50V DC even with a few miliamps of current could possibly stop your heart if you're not careful with it. and while this doesn't reach 100V of voltage, but since it involves high current, it needs your utmost attention. 70V of DC with a few amps of current is definitely much more lethal than the 240V AC that you get from your wall plug. ^ and that's a friendly reminder. |
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Jan 31 2006, 03:32 AM
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Senior Member
1,359 posts Joined: Jan 2003 From: Ipoh
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QUOTE(thedoctor @ Jan 31 2006, 02:47 AM) caution though, the design involves high DC voltage (about 70V) and a high amperage current (more than 2Amps). In simple words, is it too dangerous for first timer to DIY? or too dangerous for end-user using it?high DC voltage + high amperage = a definite no-no for first timers. After reading some simple review, a tube + chipamp combo sound like a great idea, but a noob like me certainly won't be able to soldier the amp myself, perhaps I should ask thedoctor for a favor here Another stupid question from me, is it ok to intergrate a headphone out and volume control knob into the amp? |
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Jan 31 2006, 07:12 AM
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Senior Member
941 posts Joined: Nov 2005
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thedoctor: May i know where can i get those LM3886T at a fair price? I wanna experiment with that chip for a small amp. Could you point me to somewhere? Thanks.
GodLuvSxS: Safety always come first. Trust me i have alot exciting experiences ( main fuse at home get blown, bursting of capacitors, short of transformer (1A rating), electricity shocks (few times since i was a kid) etc.. I am not discouraging people to do DIY electronic, in fact i am encouraging people ( peer friends etc ). It is alot of fun regardless of the pain and sweat i gone through this years. SAFETY FIRST This post has been edited by wui223: Jan 31 2006, 07:13 AM |
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Jan 31 2006, 08:50 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(GodLuvSxS @ Jan 31 2006, 03:32 AM) In simple words, is it too dangerous for first timer to DIY? or too dangerous for end-user using it? too dangerous for first timers to DIY. but if it's shelled in a case, and properly shielded, then end users don't have to worry a bit about using it.After reading some simple review, a tube + chipamp combo sound like a great idea, but a noob like me certainly won't be able to soldier the amp myself, perhaps I should ask thedoctor for a favor here Another stupid question from me, is it ok to intergrate a headphone out and volume control knob into the amp? ah, a pre-output and a power-output. theoritically, yes. i just need those high amperage transformers to really know whether the tube-preamp stage could be separated from the power-amp stage without affecting the speakers connected to the power amp stage. from my experience working with chipamp before this, they need connection to the signal ground for stability, and some even need connection to the signal wire even when there's no signal (no music) just to ensure the chip won't oscillate. weird. for a headphone out directly feeded from the power stage is also possible, but you do need to lower the power since those LM3886 at 70V is capable of 68W of power and you don't need more than a few hundreds miliWatt to drive a headphone. plug it in directly and the drivers will be fried. but a high wattage resistor in series to the output should be safe enough. and volume control is just an added feature just before the input capacitors. so yes, that's also doable. in fact, the datasheet did show a volume control implementation, but some GainClone designs don't implement it. ^ but i still think a tube-preamp output is more suitable for the purpose. that should have the lowest THD and less colouring to the signal path. i prefer not to have too many artificial flavors in my setup. QUOTE(wui223 @ Jan 31 2006, 07:12 AM) thedoctor: May i know where can i get those LM3886T at a fair price? I wanna experiment with that chip for a small amp. Could you point me to somewhere? Thanks. i got those from Guo Wa Sdn. Bhd, up south in JB.here's the address : Guo Wa Sdn. Bhd. 118 - 120, Jalan Keris, Taman Seri Tebrau, 80050 Johor Bahru, Johor. also, Marom Electronics in Taman Sentosa also stocks those LM3886 chip. but priced a bit higher than Guo Wa, but still cheaper than RS and Farnell of course. i don't have their full address, but it's located somewhere on the opposite side facing The Store (inline with RHB Bank). for the schematics, you could refer my post at the top of the page, or just type 'gainclone' in Google. there's lots of info floating around. another good reference is the DiyAudio forum, in the Chip Amp Section. QUOTE(wui223 @ Jan 31 2006, 07:12 AM) GodLuvSxS: Safety always come first. Trust me i have alot exciting experiences ( main fuse at home get blown, bursting of capacitors, short of transformer (1A rating), electricity shocks (few times since i was a kid) etc.. right on. if necessary safety measures is well taken care off, then the risk is minimized. a tip : make sure you discharge the capacitors first if your circuit involves high voltage.I am not discouraging people to do DIY electronic, in fact i am encouraging people ( peer friends etc ). It is alot of fun regardless of the pain and sweat i gone through this years. SAFETY FIRST |
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Jan 31 2006, 08:53 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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^ er, you do know that both shops that i mentioned is located in JB right?
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Jan 31 2006, 11:09 AM
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Senior Member
1,359 posts Joined: Jan 2003 From: Ipoh
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QUOTE(thedoctor @ Jan 31 2006, 08:50 AM) too dangerous for first timers to DIY. but if it's shelled in a case, and properly shielded, then end users don't have to worry a bit about using it. In fact, I'm going to pair gainclone with my coming soon little dot III, was thinking to use LDIII as headphone amp but in the end decide to make it as preamp in a speaker setup, set myself a RM2k budget hunting for a decent power amp. After some brief idea and reading about gainclone, perhaps I should go for DIY set, so that I could spend rest of my budget on a decent DAC ah, a pre-output and a power-output. theoritically, yes. i just need those high amperage transformers to really know whether the tube-preamp stage could be separated from the power-amp stage without affecting the speakers connected to the power amp stage. from my experience working with chipamp before this, they need connection to the signal ground for stability, and some even need connection to the signal wire even when there's no signal (no music) just to ensure the chip won't oscillate. weird. for a headphone out directly feeded from the power stage is also possible, but you do need to lower the power since those LM3886 at 70V is capable of 68W of power and you don't need more than a few hundreds miliWatt to drive a headphone. plug it in directly and the drivers will be fried. but a high wattage resistor in series to the output should be safe enough. and volume control is just an added feature just before the input capacitors. so yes, that's also doable. in fact, the datasheet did show a volume control implementation, but some GainClone designs don't implement it. ^ but i still think a tube-preamp output is more suitable for the purpose. that should have the lowest THD and less colouring to the signal path. i prefer not to have too many artificial flavors in my setup. I know it's a bit rude but thedoctor could you please help me build one? Anyway wish you good luck in your gainclone DIY |
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Jan 31 2006, 11:52 AM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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a complete GainClone DIY would cost how much, component, pcb, matching psu, everything with the bes components that are easily available (except casing)?
If the price is right, might as well skip my NAD n get SpitFire DAC...dreaming... |
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Jan 31 2006, 12:17 PM
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Senior Member
2,864 posts Joined: Jan 2005
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Lol, do a search on the "Patek" gainclone for a rough idea of that
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Jan 31 2006, 12:36 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(GodLuvSxS @ Jan 31 2006, 11:09 AM) In fact, I'm going to pair gainclone with my coming soon little dot III, was thinking to use LDIII as headphone amp but in the end decide to make it as preamp in a speaker setup, set myself a RM2k budget hunting for a decent power amp. After some brief idea and reading about gainclone, perhaps I should go for DIY set, so that I could spend rest of my budget on a decent DAC why would you call that rude? I know it's a bit rude but thedoctor could you please help me build one? Anyway wish you good luck in your gainclone DIY i don't find requests like that in any way offensive. i do think forumers are in a way frightened to ask me. i'm not gonna get angry lah. anyway, let me finalize the design and test it before offering it for DIY. i'm still searching for a proper case to put the amp in since i definitely need something a lot bigger than the cases i've used before this. the amp is gonna be huge! at least as big as the normal amp that you see on the retail shelves. the GainClone requires separate transformers for each channel to perform at its max potential. in fact, even when it's housed in a single case, the amp is actually 2 monoblocks operating as one with each driving a dedicated channel separately using its own dedicated power source. separate transformers, separate chip, separate heatsinks, sharing the same IEC inlet in two monoblocks configuration. in fact, i even see people uses 4 different transformers to feed the power (one for each positive and negative rail), with power floating to about 24 Amp. an overkill if you ask me. but then again, at least we'll know that the amp will have enough juice.the thing very interesting about DIY is how you could tweak the specs to your individual need. and with the LM3886 ability to be inverted, paralleled, and operated in bridged configuration, the possibilities is unlimited. though the TA2020 (Tripath chip in the raved Charlize and Sonic Impact T-Amp) have a marginal improvement over the LM3886 chip used in the GainClone, it can't be used in those type of configurations. the TA2020 series can only be operated in non-inverting mode, in unbridged configuration. it's also stucked to about 6W-10W of power and since it can't be paralleled nor bridged, you're stuck with that figure for the rest of the amp's life. the TA2020 also has a high distortion figure once the amp starts to output more current than 10W. and while this might not be a problem in your usual listening volume or if you use high sensitivity speakers, it's still difficult to upgrade if should you need higher power output for bigger floorstanders for instance. compared, the Tripath should never be operated above 10W, but the GainClone should never be allowed to operate above 100W for the THD to jump. see below THD figures for comparison.   [left is the TA2020 THD figure, right is the LM3886's] as you can see, the THD of LM3886 should float less than 0.1% for most of the time, and only jumps if it's outputting more than 100W. and the TA2020 should work at best at about 6W-7W. that is about 10 times the output power and if that's not enough, you could bridge them to even lower the THD + crosstalk + noise figure and quadruple the output power. er, did i say quadruple the output power? oh, i did. let me bold that for you. |
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Jan 31 2006, 12:49 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(Tachikoma @ Jan 31 2006, 12:17 PM) Lol, do a search on the "Patek" gainclone for a rough idea of that naah.. i still think this is better priced. heck, it even includes the schematics!ok, not the full schematics. but judging from the partial schematics, it's more or less an OTL tube preamp feeded into a power stage. with an acceptable looking case of course. and slaps USD2999 to it to make it 'appealing'. and heck, the review here and here emphasized on the amp not being a 'budget amp'. a few times that is! |
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Jan 31 2006, 12:54 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(ijan @ Jan 31 2006, 11:52 AM) a complete GainClone DIY would cost how much, component, pcb, matching psu, everything with the bes components that are easily available (except casing)? how much do you think this PCB would cost?If the price is right, might as well skip my NAD n get SpitFire DAC...dreaming...  ok, i might be exagerrating too much.. but heck, look at that thing! that shouldn't cost like a few bucks right? original thread here.i'll get back to you with the projected cost in a short while. |
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Jan 31 2006, 05:34 PM
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Senior Member
2,864 posts Joined: Jan 2005
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I think I'm still going to stick to the charlize
6-7 watts of power will be enough to power a K1000 even, lol. (not really planning to venture into the loudspeaker world...) |
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Jan 31 2006, 06:58 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(Tachikoma @ Jan 31 2006, 05:34 PM) I think I'm still going to stick to the charlize but that still needs a 12V regulated power supply, with proper case and connection. 6-7 watts of power will be enough to power a K1000 even, lol. (not really planning to venture into the loudspeaker world...)if you ask me, the only thing holding back people from getting the Charlize is the extra need for those things. most people would really appreciate if the Charlize comes fully assembled, fully tested with a decent case and power supply in a package. but then again, just look at how Monica2 fully cased is priced at. casework is the toughest part in DIY, and thus it's priced accordingly. |
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Jan 31 2006, 07:00 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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ohhkay..was a bit rajin today n had a look at the schematics n...holy craphomoly!! Wat is that, a CMOY for speakers, hehe! Im sure the most trouble would be the DC power supply.
theDoctor, if ur free n finalized the total rough price, do tell k! Its either RM1.4K NAD 320BEE or ur GainClone at RMXXX. Dun wan to repeat my troublesome experience of my AB Amp..component searching this searching, free time searching bla bla bla.. This post has been edited by ijan: Jan 31 2006, 07:02 PM |
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Jan 31 2006, 07:20 PM
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Senior Member
945 posts Joined: Mar 2005
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QUOTE(ijan @ Jan 31 2006, 11:52 AM) a complete GainClone DIY would cost how much, component, pcb, matching psu, everything with the bes components that are easily available (except casing)? LOL, please support the DAC bulk when time come.If the price is right, might as well skip my NAD n get SpitFire DAC...dreaming... |
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Jan 31 2006, 07:29 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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its too exp aa...hehe! im thinking of Monica2 CS8414 DAC, sum where half the SpitFire..loan me money can?
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Jan 31 2006, 07:39 PM
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Senior Member
945 posts Joined: Mar 2005
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QUOTE(ijan @ Jan 31 2006, 07:29 PM) its too exp aa...hehe! im thinking of Monica2 CS8414 DAC, sum where half the SpitFire..loan me money can? Get one lor b4 the gathering, let us listen lor since u are buying. Maybe we all like. |
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Jan 31 2006, 07:42 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(ijan @ Jan 31 2006, 07:00 PM) ohhkay..was a bit rajin today n had a look at the schematics n...holy craphomoly!! Wat is that, a CMOY for speakers, hehe! Im sure the most trouble would be the DC power supply. theDoctor, if ur free n finalized the total rough price, do tell k! Its either RM1.4K NAD 320BEE or ur GainClone at RMXXX. Dun wan to repeat my troublesome experience of my AB Amp..component searching this searching, free time searching bla bla bla.. the hassles of DIY involves those things. not to mention the time it takes just to research for the best possible configuration at an acceptable price range.the GainClone could be considered as the CMOY of power amps, utilizing very few components, yet able to be tweaked into a monster. the tweaks is too many to choose from, with discussions going on all over the net for it. but if i were to build one, be rest assured that it won't be implementing anything 'cheap'. well, not cheap enough that you would want to mod it. i'm forseeing lots of use for these caps :  ^ now, you wouldn't wanna try and mod it with something better right? that is if you could your hands on something better. QUOTE(airbag_grado @ Jan 31 2006, 07:20 PM) LOL, please support the DAC bulk when time come. er, anyone ever stumbles upon something named 'Guzzler DAC'? i have no idea how that would compare to other DACs on the market. but since it's DIY'able, i'm gonna try looking into that. |
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Jan 31 2006, 07:58 PM
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Elite
1,040 posts Joined: May 2005 From: north + south
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ok, call me ignorant.. but these :
are actually Mallory Type LP Long Life-Stable ESR series capacitors. datasheet here. and even more interesting, the left are ELNA LPO Audio Grade Polarized Electrolytic Capacitors. mentioned here here and here. QUOTE An equivalent Elna for Audio series black, costing some Euro 15-25, will have a speed in the range of 80-90V/uS good god, what have i found? a whole stack of premium capacitors! now, nobody wouldn't ever wanna mod those right? and to think that i've bought a few to test without even knowing what i'm buying. |
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Jan 31 2006, 08:45 PM
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Senior Member
3,448 posts Joined: Jan 2003 From: Sarawak
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how many m one getting at euro15..dun tell me one..hehe! Yeah, i know DIY are hard werk..but if trouble comes up, then its more hard werk. Thats why waiting ur price n review on the gainclone..no worries, ill only get my setup in 4 months time..haf to wait till i finihs my studies first, ma fan buy it n use it at hostel when everybody's impression of ATP3 is heavenly and the the brand altec spells GOD..cit! Speaking its name would get u some..ooo...wow..uuu..aaa..
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Jan 31 2006, 11:47 PM
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Senior Member
2,864 posts Joined: Jan 2005
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QUOTE(thedoctor) if you ask me, the only thing holding back people from getting the Charlize is the extra need for those things. most people would really appreciate if the Charlize comes fully assembled, fully tested with a decent case and power supply in a package. Heh, USD300 for the monica 2 encased >_> I'm thinking of using battery power, anyway.but then again, just look at how Monica2 fully cased is priced at. casework is the toughest part in DIY, and thus it's priced accordingly. |
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Feb 1 2006, 12:29 AM
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Elite
1,040 posts Joined: May 2005 From: north + south
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QUOTE(Tachikoma @ Jan 31 2006, 11:47 PM) Heh, USD300 for the monica 2 encased >_> I'm thinking of using battery power, anyway. ah.. battery power is indeed an option. but, do you take into consideration the hassles of replacing the pack once in a while?though there's still some argument on the issue, a super regulator like the one used in Gilmore Dyna series, or the Jung Super Regulator might be better than even battery packs. ripples and noise from those regulators are at a bare minimum and they don't have voltage drift like batteries. they could supply a steady, clean power with high current (if needed) and they won't run out. i'll take those super regulators anyday. but then again, those are quite somewhat hard to build. |
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Feb 1 2006, 12:31 AM
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Senior Member
2,864 posts Joined: Jan 2005
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Heh, I would too, if you'd build one for me
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Feb 1 2006, 07:54 AM
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Senior Member
941 posts Joined: Nov 2005
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Battery: Portable,easier to handle,less troublesome. BUT might burn you a hole in pocket IF consider the long term cost.
AC/DC Power supply unit: Save money IF consider using it for long period of time. BUT the initial investment might be higher depends on one's need. |
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