/diy/ - Do It Yourself

>>1217899
>I'm also considering running them off the same 5V USB supply which would further complicate things
Redrawing and reannotating.
You should definitely add that cap C3 on the input ground or you could be sad.
The tablet probably assumes the output has no other dc paths to any of its own components. C1-C3 block any dc path between it and your common USB supply. These should be non-polarized, decent tolerance and fairly large, 1uF 20% is probably good. R2 and R3 keep the inner side of C1 and C2 near the virtual ground potential. Values in the 1k-50k range are probably good, adjust for desired frequency response. If your tablet expects headphones rather than line levels on the output, consider low-value resistors (~64 ohms, not shown) on the jack between pins 1 and 3, and pins 2 and 3, so that the amplifier in the tablet has the dc path it expects.