Pedal rebuild Oscillation?

[diminishedlogic]

If some of you remember my first post. I posted a fairly hacked up 250 clone.

Well, since then. I've rebuilt it/modded it/ tweaked it several times after I got it working.

Now, After this last rebuild the pedal oscillates as i turn the volume/gain pots.

I suspected overheated parts so i replaced a capacitor to no avail. I resoldered the jacks and dc power supply.

My guess is that i didnt twist the wires of the DC input.

Is it possible that the IC overheated?

Has anyone experienced this kind of problem?

[Barcode80]

The DC input will have absolutely zero to do with oscillation. audible oscillation will be in a signal path, not in a power path. and twisting power wires is a neatness thing, it doesn't do anything related to sound or noise...


Sounds like you have a solder bridge somewhere. Can you post voltages?

[diminishedlogic]

Unfortunately I don't have a multimeter.

Some of the plastic coating on the PCB has been stripped exposing the traces... perhaps that is it?

Or maybe the excess flux on the surface of the pcb is conducting something... those are the major problems with it. perhaps i applied too much heat to the electrolytic capacitors? could the film capacitors be busted?

Thank you for your response about the solder bridge I will investigate this when I get home

[tiges_ tendres]

Often it's the length of your wires that causes the problem.  If they are excessively long, this can cause oscillation.

[diminishedlogic]

i Got a multimeter what voltages should i give you? forgive the newbishness...