I bought a few Bluetooth amplifiers and sold 3 of them here on the forum https://www.avforums.co.za/index.php/topic,59970.0.html.
I did not expect too much from it, because its intended purpose was just for rudimentary testing of speakers. However, those who got this amp were probably disappointed at the noise level coming from the radio section. My project has been on ice, but I recently revived it. In the meantime, I had stumbled across a modification that defeats this noise. Implementing the mod has the negative consequence of losing the analogue input/output on the mini jack. That is not a problem for me, because I'll only be using BT. FWIW, it is possible to wire the mod differently to use the signal from the jack. I don't have the info at hand to do this, though it should become apparent just by scrutinising the existing mod.
I did the modification last night, and can report that it is effective.
Here is the link to the instructions for this specific board: http://www.diyaudio.com/forums/class-d/293475-sanwu-tpa3116-csr8635-bluetooth-4-0-noise-fix-post5311614.html
Here is a link to the main thread: http://www.diyaudio.com/forums/class-d/293475-sanwu-tpa3116-csr8635-bluetooth-4-0-noise-fix.html
If you would like to receive a pdf file with instructions (the original pages I included when you got the board, plus this mod) then do send me a pm with your email address.
I'd be willing to help anyone who does not have the equipment or skills to do this mod.
I did not expect too much from it, because its intended purpose was just for rudimentary testing of speakers. However, those who got this amp were probably disappointed at the noise level coming from the radio section. My project has been on ice, but I recently revived it. In the meantime, I had stumbled across a modification that defeats this noise. Implementing the mod has the negative consequence of losing the analogue input/output on the mini jack. That is not a problem for me, because I'll only be using BT. FWIW, it is possible to wire the mod differently to use the signal from the jack. I don't have the info at hand to do this, though it should become apparent just by scrutinising the existing mod.
I did the modification last night, and can report that it is effective.
Here is the link to the instructions for this specific board: http://www.diyaudio.com/forums/class-d/293475-sanwu-tpa3116-csr8635-bluetooth-4-0-noise-fix-post5311614.html
Here is a link to the main thread: http://www.diyaudio.com/forums/class-d/293475-sanwu-tpa3116-csr8635-bluetooth-4-0-noise-fix.html
If you would like to receive a pdf file with instructions (the original pages I included when you got the board, plus this mod) then do send me a pm with your email address.
I'd be willing to help anyone who does not have the equipment or skills to do this mod.
