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Old 6th September 2011, 03:14 AM   #1
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Default T3 stereo 300W amplifer board

Hi all.
I got the PCB yesterday and it took me 2 hours to finish to solder work. Now here it is.
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Old 6th September 2011, 05:28 AM   #2
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Give gas, I want to buy ;o))

When have the boards in your shop.

Greeting

Michael
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Old 6th September 2011, 05:43 AM   #3
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I made only 1 pcs by now
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Old 6th September 2011, 06:15 AM   #4
trevmar is offline trevmar  United States
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Looks like a nice, clean, board

I see a 680nF output cap, and two 100nF Zobel caps. Are they enough to critically damp the output inductor?
.

Last edited by trevmar; 6th September 2011 at 06:18 AM. Reason: typo
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Old 6th September 2011, 08:23 AM   #5
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Quote:
Originally Posted by trevmar View Post
Looks like a nice, clean, board

I see a 680nF output cap, and two 100nF Zobel caps. Are they enough to critically damp the output inductor?
.
yes, we have some SMT parts for filter very close to the chip.
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Old 6th September 2011, 09:08 AM   #6
kc7wdg is offline kc7wdg  United States
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+1
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Old 6th September 2011, 09:12 AM   #7
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Looks great hifimediy.

One comment though. I still don't understand why you (and other designers) place the output chip, and thereby the heatsink, on the component side of the PCB instead of the more natural bottom side so that it would be much easier to bolt onto a heatsink.
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Old 6th September 2011, 09:32 AM   #8
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Quote:
Originally Posted by Saturnus View Post
Looks great hifimediy.

One comment though. I still don't understand why you (and other designers) place the output chip, and thereby the heatsink, on the component side of the PCB instead of the more natural bottom side so that it would be much easier to bolt onto a heatsink.
On the T3 mono version, we put output chip on the bottom side of pcb. That just depend on design.
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Old 6th September 2011, 10:39 AM   #9
alkasar is offline alkasar  France
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Hello,
so here it is excellent news.

tell us more
- i see 3 power terminals. Do I understand correctly that this board can be powered by AC dual voltage transformer or DC single voltage ?
- does it have external on/off control same as you have on T4 (PWR down connector) ?
- did you use the tripath output filter topology (like on T2) or the ST topology (like T3) ?
- have you already measured the board THD / IMD. How does it sound ? what is the gain setting on this board ?

Thanks

Last edited by alkasar; 6th September 2011 at 10:42 AM.
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Old 6th September 2011, 03:39 PM   #10
trevmar is offline trevmar  United States
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Quote:
Originally Posted by hifimediy View Post
yes, we have some SMT parts for filter very close to the chip.
When testing the new SURE TDA7498 board, I found their SMT ceramic caps for the output filter were the cause of excessive harmonic distortion, which cleared up when I replaced them with poly film. I know that it is customary to use ceramic SMT for the less critical components in the filter network, but is this really a good idea in an audiophile-quality product? Have you checked the harmonic distortion in the 1-20KHz region using both SMT and film capacitors?
.
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