April 29, 2009
Still plugging away on my big project. All goes well, except my 8ohm speaker is giving off a trememdous amount of noise while it's on. It works fine, but there is always a high-pitched "white" noise.
In addition, my project uses small servos, and i've noticed a "click" sound come out of the speaker whenever I turn the servo off (low 1). I assume the problems are related.
Is there too much power going to the speaker? Do I need some sort of voltage regulation or supressive diodes or who knows what?
The over-simplified schematic:
I'm at work, so I can't remember the value of the 'big' resistor, just that it was big.