0 | 0 | ||
Well, I've not built this, so can't comment from experience, but given your problem seems to be that your waveform is not symmetrical about 0V, I was looking for any DC asymmetry. If the voltage output from the 78L12 is 10.4V too, then that might be O ...
https://electro-music.com/forum/viewtopi...742#450742