it looks like to me you have too much going on… what does the mosfet do? … in any event the sound is the servo hunting for zero point… you should revise the sketch to sweep and it will have no further problems
it looks like to me you have too much going on… what does the mosfet do? … in any event the sound is the servo hunting for zero point… you should revise the sketch to sweep and it will have no further problems