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DIY T-Amp User V2, TA2020 AIR CORES!, ~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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LittleGhost
post Jan 30 2009, 10:46 PM

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QUOTE(Y.C. @ Jan 19 2009, 11:47 AM)
This seems old as a 20K ohm volume pot SHOULD sound louder than a 50K ohm unit; bearing in mind that P = I²R and accordingly I = √P/R. If your 20K ohm volume pot is mounted separately in another box, remember to use interconnects of short length with low capacitance value.

BTW, I will try to reschedule our meeting again sometime this week before we break for CNY holidays; my apology for failure to meet up last week.
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Huh?

If the pot is in line with the source, there shouldnt be a difference in volume. If there is, something is wrong.

A larger value merely means more input impedance, noise and tracking. Nothing else. If you pay attention carefully the pot is wired as a voltage divider. Since the input of the amplifier is very high (assume infinity), this means that the subsequent stage has a very stiff loading and it should not affect the voltage transfer at all. Do remember that an amplifier is also an impedance transformer.


One should use as low as possible, without sacrificing noise and tracking capability. EDIT: Of course, also not too low until it suffocates the source.

This post has been edited by LittleGhost: Jan 30 2009, 10:48 PM
LittleGhost
post Feb 1 2009, 11:14 AM

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ME LIKELY!!!

Hammond spraypainted?
LittleGhost
post Feb 1 2009, 11:52 AM

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I really must get my hands on that aluminum case.

Eurocard size I presume? How much is it?

How much do they charge for that kind of spray service. It does give me ideas for giving it a commercial look.
LittleGhost
post Feb 1 2009, 11:58 AM

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Allu Alloy?

It's slightly cheaper than the Hammond Equivalent. Boleh consider.

How commercial? Maybe spray painted logo/words using templates. Perhaps cheaper than regular laser etching?
LittleGhost
post Feb 10 2009, 11:46 PM

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2nd recommendation for the Sanwas over here.

I'm using CD771 for quite a few years and it has been a great toy to abuse.

EDIT: Display is decently huge and it's very rigid and solid. Dropped it a few times too but the rubbery layer on the outside protected it very much. Around RM200 range.

This post has been edited by LittleGhost: Feb 10 2009, 11:47 PM
LittleGhost
post Feb 11 2009, 09:06 AM

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There's a reason I wouldnt want to recommend the Flukes.

Well the Sanwa does as well too. If i really want to spend i'd rather save the money and spend in on scopes+signal generators.

But really, that's just me.
LittleGhost
post Feb 11 2009, 10:13 AM

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QUOTE(March05 @ Feb 11 2009, 09:46 AM)
Tell us, tell us lah!  biggrin.gif

biggrin.gif bsl knows me well enough. Honestly, my wandering mind is now shamelessly swinging to the Sanwa CD880a. A huge difference of RM90 over the TENMA (that's a lot of teh tariks + satay thrown in  brows.gif ) The Sanwa CD771 is eye catching....I like the huge display, but the price seems to be RM300++ in reality unless I'm looking in all the wrong places.

FLUKE 80 V series is worth drooling over, but completely out of my budget, I think. The 73 series unfortunately seems to have no capacitance measurement....(I need this, that's the one parameter I've always missed with my current multimeters).

Appreciate the feedback, folks. Maybe some of the other readers here are also in looking for DMMs, so they will also find good use of your suggestions.
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Reasons: Expensive, money better spent on more practical equipments such as scopes and signal generators. I'm now even adding a PCB Miller in my list unfortunately saving up for that much money will take years. (SAD)


I got my CD771 for Rm220 three years ago. smile.gif EDIT: Should be even cheaper now.

You're getting it at the wrong places.

EDIT:
http://forum.lowyat.net/index.php?showtopic=917206&hl=fluke

The Fluke looks like a pretty decent buy though. But if yuo're patient there should be more nicely priced second hands that will do better than sanwas if you're not keen on the sanwas.

This post has been edited by LittleGhost: Feb 11 2009, 10:21 AM
LittleGhost
post Feb 13 2009, 08:35 PM

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I want to meet you people so desperately. Especially if we're meeting in someone's workplace/garage/workstation.
LittleGhost
post Feb 13 2009, 09:38 PM

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QUOTE(jazzy939 @ Feb 13 2009, 08:41 PM)
We are?  shocking.gif Wonder where.... hmm.gif
*
i meant that as in "if we were going to meet". A hypothetical speech.
LittleGhost
post Jan 15 2010, 11:12 AM

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Considering the cost of other amplifiers, the F5 is hard to beat by it's simplicity and cost/performance.
LittleGhost
post Jan 15 2010, 08:51 PM

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IIRC, cschua sent me a link to amplifier cases sold in hifi4sales.net

You can hunt for it over that site. Price seems reasonable.

I think I saw a few ones over taobao too.
LittleGhost
post Jan 15 2010, 10:57 PM

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dude, the drawer idea is brilliant.

If you get the old fashion looking drawer, it's even better with the classy varnish look.
LittleGhost
post Jan 26 2010, 03:11 PM

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QUOTE(toda6866 @ Jan 26 2010, 11:07 AM)
jazzy,

thanks for the tips, i've already noted Hakko soldering gun earlier

jz wanna see if theres other brand which is also good

btw, can get all these stuffs from JP?

power drill i got at home, can save some money, i think its a bosch
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the trend is simple.

You start with a normal heater type soldering iron, then you either go straight to soldering stations with temperature control, or you go with ceramic heater type soldering irons.


For your case, if you don't want to spend a lot on a soldering station, get the ceramic iron. It'll last you for a long time.

The hakko one is about RM80-100. Just get the necessary tips.

Hakko makes good tips, that's probably the only reason to get their stuffs.




LittleGhost
post Feb 9 2010, 09:49 PM

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^Aego-M already has an internal amplifier that is attached to the woofer.

Unless you have a way to separate them and still give the same drivability to the woofers, then it should not be a problem.
LittleGhost
post Feb 12 2010, 10:59 PM

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who's hosting biggrin.gif?
LittleGhost
post Feb 12 2010, 11:04 PM

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tongue.gif current limiting isnt working as intended, mana boleh?

Maybe it isnt broken yet.
LittleGhost
post Feb 13 2010, 12:01 AM

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Can you get the chip locally? It's not hard to swap the old chip with a new one.
LittleGhost
post Feb 13 2010, 07:13 PM

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wei chchyong89 taikor,

why you so sui kena engine maths :'|
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