Stereo Micro AMP squealing

[spoontex]

Hi,

I've build a stereo microamp. But when I put the pot at max, the pedal start to squeal. I don't know if the problem is for the opto bypass or for the circuit itself.

Anybody can help?

Thanks.

[spoontex]

Solved.

When I use in mono I need to gnd the second output...   

[idy]

Those things are handy. I use them with jacks wired so if only one input is used it feeds both, and if only one output then two outputs are mixed. Can be a mini mixer (voice and guitar) and line driver.
I have my doubts about the double gang pot, and have had better luck with separate ones for each channel. Mine use charge pumps, and the one with the double pot can whine and even squeal with gain maxed (which I never need.)

[antonis]

When I use in mono I need to gnd the second output...   

Interesting enough..
(10k is always there, permanently grounded, isn't it..??)

[idy]

Did you think of grounding the input of an unused channel? Instead of the output.