I have a little mic + pre-amp board and a little class D amp board. mic output -> 20nF cap ->
audio + input on the amp and
audio - input is tied to ground.
Where do I introduce a potentiometer to control the output volume?
If I put the microphone output on a voltage divider to ground, if it ever goes 100% to ground would that short out the pre-amp?
Both the mic pre-amp and the class D amp have little tiny gain trimpots, but I would like something more user accessible.
[in the diagram below I used op-amp symbols for both the pre-amp and the class D amp, and class D amp has differential output.]