Can runaway oscillation (in, for example, a Sea Urchin) damage the PT2399 chip or other assorted parts in the circuit? I assembled a Sea urchin last night, and it worked, though was a bit noisier than usual. When playing around with allowing it to self-oscillate, suddenly it stopped echoing and started just passing signal. Tried power reset, waited 5 minutes, etc., it wouldn't start working again. I then tried no fewer than 4 other PT2399s before I was able to get one working again.
Also, is there a way to volume-limit the oscillation so that it doesn't kill the pedal/amp/listener?
Thanks,
Shawn.
I doubt it's the oscillation, I've had pt2399's oscillating overnight by accident (amp off, delay on) You most likely have a batch that locks up. Try connecting pins 3 and 4 on the pt2399 and see if that works. If so just solder a jumper there.
Oh, I've been soldering a jumper between pins 3 and 4 on all of my PT2399's just to cover that base... it's just weird that it would work for a while and then stop. Drives me crazy. At least it isn't boxed up yet.
Maybe a faulty regulator?
When its not working see what voltage you have on pin 1 of the pt2399.
An excellent suggestion, sir! I will keep my meter handy next time I plug in and test the board.