What's the noise?

[darrenw6000]

If you build an effect and it works but then when you put it in an enclosure you get a high pitch whine/whistle (gets worse as you crank the knobs) and also does it on battery power, what causes this?

[jimilee]

Power supply? What effect?


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[midwayfair]

Usually positive feedback.

[darrenw6000]

This was a while back. It happened on a tube screamer and big muff build.  What exactly is positive feedback if you could please explain.

[JackSkellington]

I got a sort of this noise, if I understand, with a TS808. Is that like a theramin high pitch?

Anyway, I had to move a bit the wires of the gain pot. I think getting far from the jacks.
Beware the ground wires, too.
What is your off board wiring?

[m-Kresol]

with high gain circuits like this, it can be a problem of wire placement indeed. You could also try using shielded wiring for in and output.

[darrenw6000]

Ok thanks will keep that in mind