EP-booster clone makes my all guitar's vol-pots scratchy

[minopa]

Clone works otherwise well but guitar's vol pots are useless because scratchy noise. Any ideas?

- Mikko

[slacker]

Scratchy guitar volume pots are often caused by DC Voltage getting on to the pot, this could be because the input capacitor on the pedal it's plugged into is leaking and letting through DC, or maybe due to a wiring or other mistake that is letting DC get where it shouldn't.
Have you got a link to the circuit you've built, that would help us know where to look for a possible problem.

Welcome aboard

[minopa]

Here's the circuit I used:



I'll open the box someday and take another look around the board. Thanks for quick reply.

- Mikko

[blackieNYC]

You've got an input cap in that circuit. That should work. Huh. Got those cuts right?

[slacker]

A short between the 9 volt and input rows would be my guess.

[minopa]

I found the mistake! R1's other leg is in 9V, not the GND as it should. Lets fix it and see..

- Mikko

[digitalzombie]

That'll do it. If you'd had another 100K from input to ground you'd create a nice voltage bias to Q1