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Class D Switching Power Amplifiers and Power D/A conversion

Sure Electronics New Tripath Board  tc2000+tp2050
Sure Electronics New Tripath Board  tc2000+tp2050
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Old 20th June 2009, 06:59 PM   #171
audio1st is offline audio1st  United Kingdom
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Quote:
Originally posted by ElFishi


Lastly, you replaced some caps in the output stage, but not all of them. Is there something we can learn from this?

thx
I did actually replace them all.. except the Zobel.
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Old 20th June 2009, 07:45 PM   #172
mravlcax is offline mravlcax  Slovenia
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Quote:
Originally posted by audio1st


I did actually replace them all.. except the Zobel.
You have zobel caps on your board (C34, C48) and resistors? My sure board didn't have zobel components on board, thats why it was a bit rough on highs. After adding zobel filter the sound was much nicer, also change these grey caps(output capacitors) with something better.


Regards Ales


I think that all these boards from sure are without zobel network.
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Old 21st June 2009, 10:09 AM   #173
ElFishi is offline ElFishi  Europe
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Audio1st,
of course I am aware that these are your choices and thanks for sharing them.
All I'm trying is to pick your brain, so I can make my choices in a more educated manner.
I still can't follow your cut of the little streak leading up to C5 (I guess). Isn't that unconnected now?
Also, am I wrong or did you replace the output inductors, too? They look different and yet so similar.

After reading Ales' remark I checked with my board to find that indeed C34,48 and R38-41,45-48 are missing.
If you look at the picture from sure-electronics as attached to the first post of this thread you could get the feeling that these components are missing there, too.
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Old 21st June 2009, 11:04 AM   #174
audio1st is offline audio1st  United Kingdom
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Quote:
Originally posted by ElFishi

After reading Ales' remark I checked with my board to find that indeed C34,48 and R38-41,45-48 are missing.
If you look at the picture from sure-electronics as attached to the first post of this thread you could get the feeling that these components are missing there, too.
SURE do some strange things, who knows why they decided to leave them off?
I hadn't removed my heatsink, it is very well attached to the chip and didn't fancy the chip coming off with the heatsink.
I may now try a Zobel across the speaker terminals and thanks to Ales for spotting the missing parts.

The cut to C5 was easier for me than removing C5. I added a 100nF Wima across C3 to replace it, just my preference..

I have 2 boards so that is why the inductors look different.
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Old 21st June 2009, 12:21 PM   #175
mravlcax is offline mravlcax  Slovenia
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Another thing that bothers me is that bypass caps have value 6.8uF(caps in read rectangle) instead of 100nF also I think that big mistake is that the config pin(24 on TP2050) is connected to the ground instead of connecting it to the vdd pins(21,22 on TP2050). Now these two pins are connected on the 5V line via 10k resistor. I increased value to the 47k but nothing significant happened, I was hopping that I will reduce heat but without any luck.

Regards Ales
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Old 21st June 2009, 09:04 PM   #176
ElFishi is offline ElFishi  Europe
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Quote:
Originally posted by mravlcax
I think that big mistake is that the config pin(24 on TP2050) is connected to the ground instead of connecting it to the vdd pins(21,22 on TP2050).

Regards Ales
I re-wired pins 24 on both TP2050s to 21,22.
I could not notice a remarkable drop in temperature.
But then I don't have a thermometer. I just touch the heatsink with my hand and it feels moderately hot, just as before.
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Old 21st June 2009, 09:17 PM   #177
mravlcax is offline mravlcax  Slovenia
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Quote:
Originally posted by ElFishi


I re-wired pins 24 on both TP2050s to 21,22.
I could not notice a remarkable drop in temperature.
But then I don't have a thermometer. I just touch the heatsink with my hand and it feels moderately hot, just as before.
Thank you for doing this instead of me . So the only option is just bigger heatsink.

Regards Ales
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Old 23rd June 2009, 04:26 PM   #178
dublin78 is offline dublin78  United Kingdom
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Hi

I have the DIYPARADISE Charlize amp - TA2020, and I want a bit more power.

I was thinking of buying one of the Audiocostuire amps using the Tripath TAA4100A:

http://www.autocostruire.com/catalog...roducts_id=330

This Sure Electronics board is so much cheaper. How would these compare?
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Old 23rd June 2009, 09:42 PM   #179
mikebarney is offline mikebarney  United States
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Default Measurements

My amp arrived yesterday, and I did some measurements to make sure it was working correctly:
-Channel imbalance (L to R): within .04dB
-DC Offset Ch1:-21mv, Ch2: -5mv
-Power output at 1KHz at clipping: 20W into 8 ohms, 31W into 4 ohms
-Frequency response (both channels were nearly identical):
1K 0 dB
500Hz: 0dB
100hz: -.02
50hz: -.13
20Hz: -.70
----
2K: +.01
5K: +.08
10K: +.32
20K: +1.07
Note that the zobel parts were missing from my PCB also. When I added them, the respose at 20KHz improved by a bit to +.93dB relative to 1kHz.
I'll repeat these measurements after I mod the unit, but don't expect any measurable change.
Mike
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Old 23rd June 2009, 10:17 PM   #180
mravlcax is offline mravlcax  Slovenia
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Default Re: Measurements

Quote:
Originally posted by mikebarney
My amp arrived yesterday, and I did some measurements to make sure it was working correctly:
-Channel imbalance (L to R): within .04dB
-DC Offset Ch1:-21mv, Ch2: -5mv
-Power output at 1KHz at clipping: 20W into 8 ohms, 31W into 4 ohms
-Frequency response (both channels were nearly identical):
1K 0 dB
500Hz: 0dB
100hz: -.02
50hz: -.13
20Hz: -.70
----
2K: +.01
5K: +.08
10K: +.32
20K: +1.07
Note that the zobel parts were missing from my PCB also. When I added them, the respose at 20KHz improved by a bit to +.93dB relative to 1kHz.
I'll repeat these measurements after I mod the unit, but don't expect any measurable change.
Mike
Can you please tell us what psu voltage did you use when you were measuring this and what values does your components have in zobel filter. I have 470nF and 10ohm.

Regards Aleš
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