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Class D Switching Power Amplifiers and Power D/A conversion

SANWU TPA3116 + CSR8635 Bluetooth 4.0 - Noise Fix
SANWU TPA3116 + CSR8635 Bluetooth 4.0 - Noise Fix
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Old 8th November 2017, 06:38 PM   #121
Tektor is offline Tektor
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IMG_20171108_193211.jpg - Google Drive
hope that photo is good enough ;d
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Old 9th November 2017, 03:14 PM   #122
doctormord is offline doctormord  Germany
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Yes, will be back shortly.
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Old 13th November 2017, 12:44 PM   #123
doctormord is offline doctormord  Germany
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How to fix/remove/bypass the (unneeded) Diff2SE stage:

SANWU TPA3116 + CSR8635 Bluetooth 4.0 - Noise Fix-unknown_brand_v3-1_tpa3116_sediff_fix_360customs-jpg

Keep wires (per channel) close together. Every component with an X needs to get removed.
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Old 13th November 2017, 05:17 PM   #124
millstonemike is offline millstonemike  United States
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Quote:
Originally Posted by doctormord View Post
How to fix/remove/bypass the (unneeded) Diff2SE stage:

Keep wires (per channel) close together. Every component with an X needs to get removed.
Do you think it would be beneficial to use twisted pairs on each channel (e.x., salvaged from the data lines in a USB or a Cat5 cable)?
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Old 22nd November 2017, 02:35 PM   #125
doctormord is offline doctormord  Germany
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Yes.
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Old 5th December 2017, 11:38 PM   #126
larzman is offline larzman  United States
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Originally Posted by millstonemike View Post
Do you think it would be beneficial to use twisted pairs on each channel (e.x., salvaged from the data lines in a USB or a Cat5 cable)?
Mike, cat6 network cable has tighter twists and the pairs are bonded together, probably ideal for this
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Old 12th December 2017, 02:38 AM   #127
orto is offline orto  United States
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Does anybody know of a good way to add a potentiometer to these tpa3116 boards? Ideally the volume knob would control the gain for the line input and bluetooth input. Would it be as simple as removing the resistor that set the initial gain and adding a 10k pot?

Also its been forever, but thanks to your help doctormord I am now able to program the bluetooth chips on these boards. I am amazed at the capability of them. Thanks again!
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Old 12th December 2017, 07:09 AM   #128
Shaun is offline Shaun  South Africa
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SANWU TPA3116 + CSR8635 Bluetooth 4.0 - Noise Fix
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Originally Posted by orto View Post
Also its been forever, but thanks to your help doctormord I am now able to program the bluetooth chips on these boards. I am amazed at the capability of them.
I am curious to know what it is you are doing with these (programming?).
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Old 12th December 2017, 08:45 PM   #129
orto is offline orto  United States
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So far I have only changed the name of the Bluetooth device and used the 5 band eq to apply some baffle step compensation. But there are many many things you can change.
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Old 14th December 2017, 08:46 AM   #130
protos is offline protos  Greece
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I would be interested too in any links/posts on how to program the bluetooth chips.

By the way, I got some sanwu 7294 modules that have very little noise compared to the first ones- but they look absolutely exactly the same! This means there is a way to fix the problem by the factory. On the other hand the nobsound 3116 2.1 channel "audiophile" module has a lot of bluetooth static but there is no way to mod it since the preamp section is different. I tried the doctormord mod on the noisy 7294 boards but despite my 15 year diy audio soldering experience I ended up either lifting the solder pads or some other damage to the board. Just know these pads cannot take more than 1 or 2 interventions.
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Last edited by protos; 14th December 2017 at 09:00 AM.
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