Dual TPA3116 board: Fixing the AWFUL noise floor.

This amplifier board suffers from very poor distortion and noise performance out-of-the-box. In this video I explore solutions and remedy the design issues present on the board.

In a nutshell, if you want to fix one of these boards, this is what to do:

1. Swap the two gain resistors (39K and 100K, under the heatsink) of ONE of the TPA3116 chips.
2. Bridge the 10K resistor by pin 16 of the left TPA3116 with a jumper.

(This fixes the "screechy" noise caused by both TPA3116 chips trying to drive the sync input of the other.)

3. Replace the main volume and LR volume potentiometers with lower value ones (10K used in this video)

(This fixes the noise that gets worse when the potentiometers are set to the 12 o' clock position)

The potentiometers used was similar to this: http://www.digikey.com/product-detail...

These two fixes combined lower the worst-case noise floor by over 10 dB, with gains of almost 20 dB under certain circumstances, which is extremely noticeable.

My original video on this board:    • Dual TPA3116 board for the Breeze cha...  
--
THIS VIDEO IS RELEASED TO THE PUBLIC DOMAIN
To the extent possible under law, I have waived all copyright and related or neighbouring rights to this work, according to the Creative Commons CC0 affirmer. This means that anyone is free to use this content in any manner they see fit, without my objection. However, the video may still contain copyrighted content (images, video, audio, software, etc.) that does not belong to me. WHILE I DO NOT RESERVE THE RIGHTS OF ANY PART OF THIS VIDEO, THE COPYRIGHT OF THIRD-PARTY CONTENT STILL BELONGS TO ITS RESPECTIVE OWNERS. THE COPYRIGHT OF THIRD-PARTY CONTENT IS NOT WAIVED. THE VIDEO IS PROVIDED AS-IS, AND I DO NOT PROVIDE ANY GUARANTEE OF ITS QUALITY.