I'd like to fully understand the circuit marked as "Minimum Parts" at page 5 in LM386's datasheet:
- Is there any reason for 10k resistance at the input potentiometer or is it just an arbitrary value?
- For an audio application, should that be a logarithmic pot?
- There is a resistor and a capacitor connected in series to ground right after the output. It looks like a low-pass filter to me, but I've usually seen those with the load connected between R and C, not parallel to both. What's going on?
- Why is there a 250uF polarized capacitor right before the speaker? Is it just a DC blocking cap? Why 250uF and not other value? Perhaps just a high value so that the resulting high-pass filter cutoff is low enough?