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> DIY amp club V2, Post your DIY amp here (DIY)

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ar188
post Jan 20 2009, 09:45 PM

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QUOTE(jazzy939 @ Jan 20 2009, 06:35 PM)
'better' is subjective. It is all a matter of preferences, one man's meat is another man's poison. tongue.gif
Between STKs, GCs and T-Amps each have their own strentghs and weaknesses and NOT really the same platform to be compared with.. just a different means of amplification. At the end of the day, let your ears decide! biggrin.gif
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what does your ears say?
LittleGhost
post Jan 20 2009, 10:33 PM

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Build some discretes like the Hiraga and let me know if your opinions change.

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ccschua
post Jan 20 2009, 11:48 PM

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hope to see the fully discrete amp doing some whacking on the speakers.

18Wrms. Still thinking how to increase it to say 50W unbalance into 8 ohms.
jazzy939
post Jan 21 2009, 01:17 AM

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The 40W/Channel discrete.. wink.gif

QUOTE(ar188 @ Jan 20 2009, 09:45 PM)
what does your ears say?
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ar188
post Jan 21 2009, 01:31 AM

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QUOTE(jazzy939 @ Jan 21 2009, 01:17 AM)
The 40W/Channel discrete.. wink.gif
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so T-amp is out? tongue.gif
jazzy939
post Jan 21 2009, 01:46 AM

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Not entirely... love listening classicals and vocals on it.. wink.gif

QUOTE(ar188 @ Jan 21 2009, 01:31 AM)
so T-amp is out?  tongue.gif
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LittleGhost
post Jan 21 2009, 06:35 PM

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First time etching my own PCB.

user posted image

EDIT: A JFET based Class A buffer with servo control. Planning to use it for my balanced setup/just stereo buffering.



This post has been edited by LittleGhost: Jan 21 2009, 06:37 PM
wui223
post Jan 21 2009, 07:48 PM

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Littleghost: Nice job! do share with us ur project progress later
LittleGhost
post Jan 21 2009, 08:52 PM

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took me 3-4 hours just to get it right O_O"

Semi populated the board. Not sure if i want to heatsink the output transistors and bias them further.

tongue.gif. Lazy, will continue testing and debugging tomorrow.
empire23
post Jan 24 2009, 03:33 AM

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Just finished soldering in the RN60Ds for my B22. A few values missing, but will arrive on tuesday via FEDEX.

A shit load of caps also arriving from Handmade electronics, Silmics for the amp board and high voltage Nichicon KZs for the PSU board with Wima MKS2s all around, building for high voltage and high gain with 30V +- and a gain of 11. Resistors have been binned and matched for more accuracy too. Goldpoint should be arriving next next week, thus i'm looking forward to getting it. Toroid is custom wound by Tortech Australia and comes with a Mu-Metal casing shield.

Connectors are all 3pin XLR Silver plated Neutrik, why? Found them easy to use and fitting, PSU is a Positive Ground Negative, so i need 3 pins, Input and Outputs are also balanced, so it makes sense. I'm just scared being the klutz i am, i'll plug the PSUs into the inputs tongue.gif

I'm rather worried about case work rather than the amp itself. I've done tons of amps, but this will require a case of ass blasting proportions. Sigh, wish i could pay someone to do all the case work, but all the "handiwork" exihibited by my peers at Uni = worse sad.gif
ccschua
post Jan 24 2009, 08:36 AM

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How about this AV228, cost effective.

http://www.vt4c.com/shop/program/main.php?...p_id=2&hit_cat=


empire23
post Jan 24 2009, 01:45 PM

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QUOTE(ccschua @ Jan 24 2009, 08:36 AM)
I actually settled on an ATI Technology full Alu case and a custom designed Front and rear panels with Front Panel Express last night.

Expensive, but if i'm building an awesome amp, might as well go superawesome. Also ordered silicon wipers for the board mounts and connectors, lol dampening. The only thing that is generally mid end is the heatsinking, because sourcing the heatsinks is insane, and because i'm anal when it comes to lead lenght, although i made up by using silver bearing thermal grease. Was thinking of forced induction cooling with a small rear mounted EBM PAPST 60mm fan and seperate PSU, but i'll see if things pan out.
xtremedummy
post Jan 24 2009, 01:46 PM

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QUOTE(ccschua @ Jan 24 2009, 08:36 AM)
i like this one. good biggrin.gif
empire23
post Jan 24 2009, 11:55 PM

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Shit. Right now i can't remember if the Pin 1 of an XLR connector is connected to metal casing of the plug/socket and thus will mate the ground of the PSU to the socket, which is a huge no no because i wanna keep Signal and Power ground separate, but still be able to use XLR connectors to carry the power from the PSUs.

Anyways, i've already sent in the PSU frontpanels for production, about 160 Dorrars, shipping not included. Which is the shit part because i can't remember the basic XLR contruction

Specs for the PSUs, which should be finished by the end of the month. 1 PSU per 2 channels.

- Schaffner FN9263S PEM Filter
- Tortech Shielded Transformers
- Custom front and back panel plates with relevant markings
- Hammond 1455T2201 casing
- S22 PSU configured for 30V B22 Max
- Neutrik XLR for power umbilical connection
- Silicone washer dampening

i hope my memory kicks in. Been away too long. Will post pics when complete. Also finished CatEgg's M3 today except for the opamps, removed the old socketed 627s (if you're online, MSN me so i can place the order for the right opamps you want) and the heatsink mounting. Also finished the S11 PSU that was built for it. Kewl.
LittleGhost
post Jan 25 2009, 03:57 PM

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user posted image

Tested and assembled. Did no hearing test yet, but I'd assume it to be pretty good sounding. Basic Buffer application for pre amps or directly driving headphones. It's ac coupled so sources can do away the output caps.

EDIT: Next thing will be a dual rail PSU and a discrete amplifier biggrin.gif

This post has been edited by LittleGhost: Jan 25 2009, 03:57 PM
ccschua
post Jan 29 2009, 10:11 PM

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Just wonder hows the fully differential amps get going, is it musics flowing now ?

How;s the buffer circuit doing ? any diagram.

I am doing some phase lock loop filters for DAC. Wonder what type of capacitor and resistor I should use ? SMD. no way, it is too small for me to see. any suggestion .

This post has been edited by ccschua: Jan 29 2009, 10:32 PM
empire23
post Jan 29 2009, 11:52 PM

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My lazy ass finished 1 B22 board. OMFG THE RESISTORSSSSSS. I realized that i hate soldering. 3 More to go. Blardy malas, but must to itttttt. Also had some delays due to police work for my firearms lesen and the fact the stupid safe had to be bolted in (Thanks Perry for the save laugh.gif). Pic of my workbench. And note that the periuk nasi has 2 week old mushy rice in it, don't dare wash it, i blame my housemate.

user posted image


Working on an M3 too, for KucingTelur. I realized i forgot to install ze output resistors, so i had to remove the FETs doh.gif.

user posted image

Worst of all for the B22 is, i was supposed to buy 56.2 Ohm resistors, but then i bought 56.2k Ohm ones. RAGEEEEEEE. Now i must order more from Mouser! Not that i won't, but it's just a hassle and makes me boh song because the amp board is missing 2 resistors.

This post has been edited by empire23: Jan 29 2009, 11:53 PM
ar188
post Jan 30 2009, 12:23 AM

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wah 1 resistor value order from mouser.. got free shipping from US to auzzie?

empire23
post Jan 30 2009, 01:11 AM

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QUOTE(ar188 @ Jan 30 2009, 12:23 AM)
wah 1 resistor value order from mouser.. got free shipping from US to auzzie?
*
No free shipping, going to buy other stuff as well, got a few things on my list like CPF-1 Resistors, some Caddocks and Neutrik plugs.
valve_300b
post Jan 30 2009, 01:18 AM

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QUOTE(empire23 @ Jan 29 2009, 11:52 PM)
My lazy ass finished 1 B22 board. OMFG THE RESISTORSSSSSS. I realized that i hate soldering. 3 More to go. Blardy malas, but must to itttttt. Also had some delays due to police work for my firearms lesen and the fact the stupid safe had to be bolted in (Thanks Perry for the save laugh.gif). Pic of my workbench. And note that the periuk nasi has 2 week old mushy rice in it, don't dare wash it, i blame my housemate.

» Click to show Spoiler - click again to hide... «
Working on an M3 too, for KucingTelur. I realized i forgot to install ze output resistors, so i had to remove the FETs doh.gif.

» Click to show Spoiler - click again to hide... «

Worst of all for the B22 is, i was supposed to buy 56.2 Ohm resistors, but then i bought 56.2k Ohm ones. RAGEEEEEEE. Now i must order more from Mouser! Not that i won't, but it's just a hassle and makes me boh song because the amp board is missing 2 resistors.
*
i really wonder if u r an engineering student. Those are noob mistake. You can talk technical, but i doubt it's accuracy now, hahahaha

Now i should sit back and enjoy my music while u can rant on my post or give me more technical knowledge lecture smile.gif

This post has been edited by valve_300b: Jan 30 2009, 01:18 AM

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