I did a BB-type build recently and am getting some intermittent footswitch pop, even though I used an opto bypass that should prevent that. Checking for voltage at the circuit in and out, I see that there is voltage on the output going from 0v up to just over 1mv. It sort of builds up slowly and then goes back to zero if I actuate the switch a couple of times. That sort of tracks with what happens when I'm playing--the pop will get louder and louder then go back to totally silent switching for a bit. Sounds like a leaky coupling cap based on my reading on the matter. Would anyone be able to take a look at this schem and tell me which are the coupling caps? I'm suspecting the two electros of course, but am not sure if there are others to check out. Forgot to mention, there is never any voltage on the circuit input.
