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Class D Switching Power Amplifiers and Power D/A conversion

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Old 22nd July 2010, 10:04 AM   #511
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Location: Shanghai
Default Trying the T3

I have received a pair of T3. Don't have the PSU board yet. Currently hooked them up to two meanwell SMPS's, one 27V and on 36V meeting at around 30V.
They do make a sound when power on/off. First when I tried them, they made almost no sound. But I discovered that when I connected a source, a quite unpleasant, but not too loud pop/click sound emerged on turn on/off. Most when using my ipod, less with DAC, but still a bit. On the 87db/w speakers it is ok, not really a problem. on the 99db/w speakers it is more unwelcome..
Just listened a little bit to them so far.

First I connected them without any vol pot, as I didn't have any. It was of course very loud, but I also got a quite loud shhhh sound in the tweeter. Now with the pot, the shhhh is very quiet, but if I open the pot completely it is back. but as soon as I close the pot 1 mm only, it dissapears. Can anyone explain this? Not a problem of course, most out of curiousity.

I have also tried connecting them to only 1 SMPS, and could't hear any noise on my 99db/w speakers.

Last edited by Nick122147; 22nd July 2010 at 10:06 AM.
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Old 22nd July 2010, 10:12 AM   #512
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yes, it looks messy..
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Old 22nd July 2010, 10:16 AM   #513
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Quote:
Originally Posted by Don Jerry View Post
I don't know the T3 board, but I assume that you can easily desolder the rectifier and short opportunely its board plugs. Then you can connect directly the DC, respecting the correct polarity of course (I did that on my TK2050 board).
The instant off function won't work if you do this.
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Old 22nd July 2010, 10:20 AM   #514
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Quote:
Originally Posted by alkasar View Post
messy ? noooo
what is the board in the middle of the table ?
that's the v1 board
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Old 22nd July 2010, 10:23 AM   #515
alkasar is offline alkasar  France
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Quote:
Originally Posted by Nick122147 View Post
that's the v1 board
yes, did'nt recognize at first.
In comparison, the T3 board look actually smaller than I tought
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Old 22nd July 2010, 11:23 AM   #516
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Quote:
Originally Posted by Nick122147 View Post
...

First I connected them without any vol pot, as I didn't have any. It was of course very loud, but I also got a quite loud shhhh sound in the tweeter. Now with the pot, the shhhh is very quiet, but if I open the pot completely it is back. but as soon as I close the pot 1 mm only, it dissapears. Can anyone explain this? Not a problem of course, most out of curiousity.

...
EMI? You can try to connect the metal part of pot to GND on board.
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Old 22nd July 2010, 01:17 PM   #517
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who won finally the amp boards ? Obviously Nick is gambling with cards ...
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Old 24th July 2010, 08:38 AM   #518
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I modded my V2.0 - 2*100W@4ohm-amps input sensitivity from 22kOhm to 47kOhm and im now happy with the loudness. Now i recieved the newer V1.1B - 2*80W@8ohm-amp and the stock input sensitivity is 50Kohm, but it doesn't sound even close to the V2.0-version of the amp. Should I double V1.1 input sensitivity aswell?
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Old 24th July 2010, 08:54 AM   #519
zog666 is offline zog666  Australia
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Default anyone using AC to power the v2 unit (or any others?)

I just fried my slightly tweaked YuanJing TDA8920 amp .. bit of an annoyance, but it was a cheapy so no stress.. (fried it due to slipping with a screwdriver adjusting a trimpot on a preamp I'm making.. BZZT dead amp..)...

Anyway I'd already ordered my HIFIMEDIY AMT2050 V2 from ebay.. which looks to be a far better amp anyway.

I was powering the now dead TDA8920 with a 18-0-18 160VA transformer, strikes me that I can repurpose this nice toroidal transformer with the windings in parallel and it will drive the AMT2050, and the enclosure with RCAs and banaplugs etc is already made. Measuring with my voltmeter the output is closer to 20VAC on this unit anyway.

Is anyone else using this with an AC power supply? I read through a lot of postings in this thread, I can see a lot of people discussing the theoretical requirements but didn't notice someone saying they are actually using AC power and what kind of results they are getting.

As a potential upgrade would upping the PSU capacitor from 4700uF help much?

thanks!
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Old 24th July 2010, 10:57 AM   #520
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Quote:
Originally Posted by whelibob View Post
I modded my V2.0 - 2*100W@4ohm-amps input sensitivity from 22kOhm to 47kOhm and im now happy with the loudness. Now i recieved the newer V1.1B - 2*80W@8ohm-amp and the stock input sensitivity is 50Kohm, but it doesn't sound even close to the V2.0-version of the amp. Should I double V1.1 input sensitivity aswell?
Hi, why not? if you like the modification on v2.
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