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Old 2nd February 2005, 02:01 PM   #1
Pano is online now Pano  United States
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Default Sonic Tripath Investigations

Hello fellow digiamp fans.

Having found the little Sonic Impact amp with the Tripath chip here and read about it on other boards, I decided to undertake the little fellow as a project.

I have not yet made any modifications, but have been studying the amp, measuring, listening. Modifications will come next.

You'll find some useful info about the amp over at my site linked below. There are measurements, waveforms and such. As I continue further investigations and modifications they will be posted here and there.

Should be a fun project.

Sonic Investigations Click the image to open in full size.
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Old 2nd February 2005, 09:31 PM   #2
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Sorry if any of you had problems with the link.
It's fixed now. (Server problem)

No coconuts.
Aloha
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Old 2nd February 2005, 10:07 PM   #3
KT is offline KT  United States
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Cool project and website. It'll be interesting to see how the measurements change after everything is burned-in and how that correlates to what you hear. That's assuming your amp sounds better after a burn-in period. Most people report that it does.

My amps sounded edgy for a good while and then smoothed out. They sound clear but warm now.

Best,
KT
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Old 3rd February 2005, 09:16 AM   #4
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i'll keep an eye on how you are doing...

dave
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Old 3rd February 2005, 11:37 AM   #5
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Aloha Dave,
I've been to your site several times - good work!
Always know it's your site when I see that crazy "Seraphim".

MM
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Old 3rd February 2005, 06:41 PM   #6
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Quote:
Originally posted by panomaniac
Always know it your site when I see that crazy "Seraphim".
David Duke was certainly inspired with those... a very ambitious project... shows what can be done with a bit of imagination.

dave
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Old 3rd February 2005, 07:09 PM   #7
joensd is offline joensd  Germany
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Hi,
nice idea to tweak that lil bargain.
Nice website so far.

You wrote that the voltage rail on the regulated side dropped to 9V under load. That clearly shows that the chip is not regulating and that you didnŽt provide the minimum input voltage to the chip (which is 14.5V but can vary).
That might even be worse for the chip than no regulator at all.
(soundwise)
12VAC should actually be enough but youŽd need a bigger type that will have better regulation than yours. I reckon 50VA would do well.

greets
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Old 3rd February 2005, 07:41 PM   #8
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While you're testing, I'd be interested to see what current draw was when driving a 4 ohm load.

I wonder if it draws more current in this condition since it should be delivering more power...
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Old 3rd February 2005, 09:14 PM   #9
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Quote:
Originally posted by joensd
You wrote that the voltage rail on the regulated side dropped to 9V under load. That clearly shows that the chip is not regulating and that you didnŽt provide the minimum input voltage to the chip
You are quite correct Sir! The little transformer can't keep up. It will be replace with toroidal 14V 60VA model. That should give the regulator enough headroom.

Lesson: Beware tiny transformers. Wallwarts? Maybe not. =)

Aloha MM
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Old 3rd February 2005, 09:14 PM   #10
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Quote:
Originally posted by bwbass
While you're testing, I'd be interested to see what current draw was when driving a 4 ohm load.
I will test that and post results. My large speakers at work have 4 ohm woofers, so this would be good to know.

Thanks for the idea.

Aloha
MM
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