/diy/ - Do It Yourself

>>1394043
Thanks for the detailed reply. Here is a picture of what I used as a base.
My bad with the booster, I tuned it on 15V actually, for highest power output of the amp. You are probably right, I could get rid of it, though the speaker would be a bit quieter then.
Is it true about the wrong polarity of the small capacitors between audio switch and pot? I assumed there are there to filter the noise but even when I tested the scheme without them I still heard this whistling sound on turn-off.