PC Soundcard experiences with Tripath amp - Page 11

deandob · 24th January 2006, 08:54 AM

Hi Bert,

I currently have a 2,200uF cap on the VN10 supply and all it does is lower the frequency of the whistle. I'm out of ideas on how to solve this annoying artifact of running this amp bridged.

Regards,
Dean

classd4sure · 24th January 2006, 02:15 PM

Hi,

The ESR of the cap would be important here I think, should be as low as possible for best results.

Where are you connecting these bypass caps to? Needs to go from VN10 to VSS. Their datasheet shows a 47uF//100nF. Hope that helps.

Bgt · 24th January 2006, 03:26 PM

Pierre, the number is 570874 - 89.
Dean, I listened to the AMP1B again last night and it only gives a little bit nof hiss at startup which disappears after a minute or 2.
Heard no whistle. I don't know either what to do next in your case. Maybe use it as a stereo amp. not bridged.
I am building the Amp 2 and it also uses the VN10 supply. Will see what it does here.

deandob · 25th January 2006, 10:46 AM

Hi Chris,

The TA2022 datasheets show the VN10 supply filtered by a 100uF cap, and decoupled by a 0.1uF located close to the pins. When you mention Vss, do you mean Vnn (Tripath data sheet negative rail)? I can try decoupling VN10 to VNN to see if that makes a difference.

Regards,
Dean

classd4sure · 25th January 2006, 02:25 PM

Hi Dean,

Ya the TA2022 wasn't the datasheet I was looking at in particular.

VNN1 and VNN2 both tie together form the negative rail. If you look on the datasheet you'll see those bypass caps going from VN10, to the negative rail, and the caps should be as close to the pins as possible, like right on top of VN10 if you can.

The reason for this is because VN10 is actually the lower gate driver supply which floats off the negative rail.

Regards,
Chris

Cyan · 13th October 2008, 10:50 PM

As i've said here on my second question: Auzen X-Fi questions
I have a strange sound distortion with my auzen Prelude and ta 10.1
Do you think i can solve this problem with black gate and audio card shielding?
I'm also gonna change the opamp and put an ad8620br, wich should lower the distortion.

24th January 2006, 03:26 PM	#103
Bgt diyAudio Member Join Date: Jan 2005 Location: NL, Voorschoten	Pierre, the number is 570874 - 89. Dean, I listened to the AMP1B again last night and it only gives a little bit nof hiss at startup which disappears after a minute or 2. Heard no whistle. I don't know either what to do next in your case. Maybe use it as a stereo amp. not bridged. I am building the Amp 2 and it also uses the VN10 supply. Will see what it does here. __________________ Kind regards, Bert

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24th January 2006, 08:54 AM	#101
deandob diyAudio Member Join Date: Oct 2002 Location: Brisbane, Australia	Hi Bert, I currently have a 2,200uF cap on the VN10 supply and all it does is lower the frequency of the whistle. I'm out of ideas on how to solve this annoying artifact of running this amp bridged. Regards, Dean

24th January 2006, 02:15 PM	#102
classd4sure Account Disabled Join Date: Feb 2004	Hi, The ESR of the cap would be important here I think, should be as low as possible for best results. Where are you connecting these bypass caps to? Needs to go from VN10 to VSS. Their datasheet shows a 47uF//100nF. Hope that helps.

25th January 2006, 10:46 AM	#104
deandob diyAudio Member Join Date: Oct 2002 Location: Brisbane, Australia	Hi Chris, The TA2022 datasheets show the VN10 supply filtered by a 100uF cap, and decoupled by a 0.1uF located close to the pins. When you mention Vss, do you mean Vnn (Tripath data sheet negative rail)? I can try decoupling VN10 to VNN to see if that makes a difference. Regards, Dean

25th January 2006, 02:25 PM	#105
classd4sure Account Disabled Join Date: Feb 2004	Hi Dean, Ya the TA2022 wasn't the datasheet I was looking at in particular. VNN1 and VNN2 both tie together form the negative rail. If you look on the datasheet you'll see those bypass caps going from VN10, to the negative rail, and the caps should be as close to the pins as possible, like right on top of VN10 if you can. The reason for this is because VN10 is actually the lower gate driver supply which floats off the negative rail. Regards, Chris

13th October 2008, 10:50 PM	#106
Cyan diyAudio Member Join Date: Oct 2008	As i've said here on my second question: Auzen X-Fi questions I have a strange sound distortion with my auzen Prelude and ta 10.1 Do you think i can solve this problem with black gate and audio card shielding? I'm also gonna change the opamp and put an ad8620br, wich should lower the distortion.

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