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DIY T-Amp user/diyer come here :), TA2024 complete build board diy

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bsl555
post Aug 11 2008, 03:20 PM

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QUOTE(xtorm @ Aug 11 2008, 02:58 PM)
hmm i duno how to diy the power supply, im pretty much a newbielah...hehe
meanwell 8.5amp smps is selling for under rm100ler... smile.gif
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Wah!.. newbie up to a great challenge ya?..
Anyway, an ample (huge?) PSU is very essential for lifting the T-amp (or any chip amplifier for that matter) to great potential. A 100kohm Alps blue log volume pot will do justice here too. Don't skimp too much if your expectations are high. Good luck!. icon_rolleyes.gif
bsl555
post Aug 11 2008, 05:09 PM

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QUOTE(vincent_audio @ Aug 11 2008, 04:42 PM)
p/s: anyone interested, i have 1x 100k for sale smile.gif
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what brand and picture please?
bsl555
post Aug 22 2008, 01:25 AM

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QUOTE(jazzy939 @ Aug 22 2008, 01:22 AM)
There're 330uF each. Total would be close to 2000uF.. Have not use them yet.. tongue.gif
Why 'uncle' ongbs not impressed with your T-Amp?  ohmy.gif
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That must have come from some PSU. Its not suitable.
What you need is uF that reads 5 figures (or you parallel them altogether) with a few hundred VA transformer (bigger the better).
bsl555
post Aug 24 2008, 12:28 PM

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QUOTE(Y.C. @ Aug 24 2008, 11:37 AM)
Thanks, xtorm and ongbs.

The 1% metal film type resistors could be found in JP? Apart from OE, any recommendation where I could pick up better grade capacitors and resistors?
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Q1: Yes, Nixie Electronics (opposite Pudu Plaza) have widest range but mostly from Taiwan.
Q2: Farnell or RS Components. (RS a bit more pricy but better and more courteous service)
bsl555
post Aug 24 2008, 09:37 PM

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QUOTE(jazzy939 @ Aug 24 2008, 08:53 PM)
Yes, its a dual output. biggrin.gif
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That tranny secondary side is single winding with center tap. Its not dual output. Dual output will have TWO secondary windings, which one end of each winding can be tied for center tap and proceed with full wave rectification. Two windings with same voltage can be connected in parallel to increase the current output, and a center tap will not exist in this case.

This post has been edited by bsl555: Aug 24 2008, 09:38 PM
bsl555
post Sep 1 2008, 12:21 AM

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QUOTE(jazzy939 @ Aug 31 2008, 10:18 PM)
My 0-30VDC Bench PSU.. tongue.gif
Was trying to check out my collection of LED's. Shorted the output! I think the regulator power transistor went to transistor heaven.. brows.gif
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Its always recommended to have a fast blow protection fuse at the DC output.
bsl555
post Sep 3 2008, 05:03 PM

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QUOTE(jazzy939 @ Sep 3 2008, 12:57 PM)
Exactly! I bought parts to build my GC but was put onhold due to the power supply issues. Darn expensive that darn toroidal transformers!  mad.gif
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How expensive can it be when for that size it delivers the huge output power compared to E-core?.
When doing DIY projects, one is not suggested to stinge too much or much will be compromised. I always advise DIY wannabe's.. Be prepared with a 30-50% overbudget for contigency...otherwise DON'T!..
bsl555
post Sep 11 2008, 08:51 PM

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QUOTE(jazzy939 @ Sep 11 2008, 08:13 PM)
I am btw, using an old, infact one of the earliest Sony's DVD player, DVP-S7000. This player makes one hell of a CD transport.. I read the reviews, bought it and I couldn't agree more! wink.gif Value for money as the condition is almost mint for few hundred bucks biggrin.gif
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It reminds me I've still got a DVP-S7700 stored away in the box for some years now. Silly me I've never used it as a CD transport as I already have a dedicated CD transport. I may do that one of these days. The video quality still beats many current DVD players, just that its not able to read recordable DVD discs.
bsl555
post Sep 14 2008, 10:22 PM

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QUOTE(jazzy939 @ Sep 14 2008, 10:19 PM)
I think the next best thing to partner our T-Amp would be buffered pre-amp!  hmm.gif
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Kawan!.....TUBE BUFFER lah!. Yep..me not Bluffing! tongue.gif
bsl555
post Sep 26 2008, 08:07 PM

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QUOTE(jazzy939 @ Sep 26 2008, 06:08 PM)
Yes it is! Have a look! tongue.gif
FAKE Elna!..but usable lah!.
bsl555
post Sep 28 2008, 02:55 AM

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Ok guys, if you wanna know more about YC caps..here's the official website.
http://www.yih-chun.com/global/index.html

I've seen it retailed at Jln Pasar since 20 years ago...I think I still have a few from 15 years ago. Unsure if its still usable.
bsl555
post Oct 2 2008, 02:06 PM

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I've tried a couple of Capxon from RS. They look like Taiwan/China made general purpose caps. They sound just acceptable. They're not in the class of being outstanding or above BG's and Cerafines.
N.B. General Purpose!. I've seen some of these in PC PSU's.

This post has been edited by bsl555: Oct 2 2008, 02:08 PM
bsl555
post Oct 3 2008, 03:37 PM

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QUOTE(jazzy939 @ Oct 3 2008, 02:47 PM)
Anybody have come across MICA or GLASS capacitors? hmm.gif
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You can google mica capacitors for more info. They are in very small capacitance in picofarads and mostly used for tuned and critical circuits in RF frequencies. Its also best used in RIAA equalization circuits but sometimes its too big and the pitch width does not permit swaps. Last but not least, they're EXPENSIVE!.. you can check out RS or Farnell for prices. Can thin down your wallet easily. Forget using them in your T-amp. No SS power amp uses them anyway except in in one part of a tube amp.
bsl555
post Oct 8 2008, 05:03 PM

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Allow me to comment.
Cheap audiophile parts is one matter, but using the RIGHT part in the right location is VERY IMPORTANT. For example, its not recommended to use a cap thats for speaker crossover in input signal path although same value or a huge 2.2uf polyprop cap frequently for tube amp but in the solid state T-amp. Some types have better results in DC coupling than in signal path, thus arising the bi-polar types being most suitable for signal path. A 10uF /10VDC cap and 10uF/50VDC cap of the same brand and series will have difference in sound as there's difference in the capacitor foils. There you have it.. Ok..over to you all!. Its not all a matter of swap swap, try try, play play and listen if it works out. There's ALWAYS a technical reason of manufacturer's choice in their layout.
Go play play with them all..good luck and have fun!

This post has been edited by bsl555: Oct 8 2008, 05:06 PM
bsl555
post Oct 8 2008, 09:43 PM

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Hey March05, Your amps are in dire need of a solid chassis, maybe a quality volume and its all good2go...State of the art DIY amp! Its singing well and flawless operation as far as I can hear.
bsl555
post Oct 9 2008, 11:35 AM

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Your T-amp got better quality and more precise trimpots than Vincent's.
I wonder if thats for ouput DC adjustment or output Bias.
bsl555
post Oct 9 2008, 03:56 PM

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[quote=March05,Oct 9 2008, 03:16 PM]
But before I start turning them tiny screws,
Uplifting huh?... you fry your speakers, he'll likely offer his condolences as well!..
tongue.gif tongue.gif tongue.gif

You better don't simply "twist-twist" those trimpots with your exensive live speakers. Experimentation is usually done with a AC/DC voltmeter connected in parallel with a 30W dummy resistor load that'll absorb any undesirable voltages or DC surges.
bsl555
post Oct 9 2008, 05:47 PM

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Errr...if you want, I can lend you my 8ohm load resistor and spare analog multimeter lah.. then you can go screwing around. Yes, you'd need a jeweller's flat blade screwdriver. I think the trimpots are for DC offset adjustments. Just adjust till you get ZERO or near zero DC voltage at output. One of them should be for the gain.
I've not looked at the circuit so I'm only guessing. There's quite some variation over various brands of this T-amp.
The load resistor is wired up with speaker terminals..just plug it in.

This post has been edited by bsl555: Oct 9 2008, 05:50 PM
bsl555
post Oct 9 2008, 05:52 PM

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I recently replaced those same precision trimpots in the NAD for DC offset and DC bias. The settings are certainly more precise compared to the original which were really nasty and way off its desired values.
bsl555
post Oct 9 2008, 06:16 PM

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Yes, I have a Signal generator. There's another way to do it. Find some testtones on the internet, 100hz, 1khz and 10kz. Write them to CDR and play it back on your CDP connected to T-Amp.
Yep..I have a oscilloscope too.. heheheheh! blush.gif
I could have splashed out for a used Audio analyzer but I don't think I'd justify the use..

This post has been edited by bsl555: Oct 9 2008, 06:19 PM

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