tk@halmi
Well-known member
This is really wierd. I have used capacitor coupling (470u/35V) on my preamp and the feedback terminal is capacitor coupled (4700u/6V) to ground as well, a very standard circuit IMHO. As I understand this should eliminate problems with DC shift. However, when using discrete opamps there is a scratchy noise when changing gain in a certain region of the pot. This does not happen when using chip opamps in the same circuit. I am wondering what is going on. What measurements would help me troubleshoot this?
Thanks,
Tamas
Thanks,
Tamas