Hey everyone, first of all, i'm sorry for regurgitating this topic.
I'm trying to fix the single ended input on a TPA3116D module i bought to work with my CSR8675.
I have seen other threads, posts and videos on this topic [1][2][3] but none of them were helpful here, because i don't quite understand the single-ended input conversion done on this board. (I'm a total beginner on this stuff)
So my naive approach here was to just remove C2, C3, C1, R4 and R5 and then add some bodge wires to the pads that go directly to pin 4,5,10,11 respectively on the TPA.
However, this didn't entirely work:
1: https://www.diyaudio.com/community/threads/tpa3116-csr8635-idle-noise.310628/page-2
2:
3: https://www.simplemedianetworks.com/mods/differential-tpa3116
I'm trying to fix the single ended input on a TPA3116D module i bought to work with my CSR8675.
I have seen other threads, posts and videos on this topic [1][2][3] but none of them were helpful here, because i don't quite understand the single-ended input conversion done on this board. (I'm a total beginner on this stuff)
So my naive approach here was to just remove C2, C3, C1, R4 and R5 and then add some bodge wires to the pads that go directly to pin 4,5,10,11 respectively on the TPA.
However, this didn't entirely work:
- The potentiometer still has some function that i honestly don't quite understand (ideally, i'd just want the TPA to run at about 70% volume and control the gain from the CSR otherwise, because this board also has the incorrect potentiometer installed like almost every other implementation...)
- The left output (pin 10,11) does not work at all and is just extremely noisy when i hook it up to the CSR
- The right output works somewhat (see next point)
- The amp seems to be in a strange state now where it won't power up "warm" (when i switch off my bench supply and switch it back on, it sometimes doesn't turn on, sometimes draws a unexpectedly high amount of current, etc., waiting a bit (presumably for caps to drain) fixes this. (I unknowingly removed some discharge resistor, didn't i? ....)
1: https://www.diyaudio.com/community/threads/tpa3116-csr8635-idle-noise.310628/page-2
2:
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Ok, i'm definitely too stupid to count. C1, R4, R5 is the gain resistor network... i put them back and finally ended up desoldering C2, C3, C4, C5 which are the correct pins and now it works as it should.
Interesting that it worked at all without the gain network though
Interesting that it worked at all without the gain network though