Index of /diy/Schematics/Distortion Boost and Overdrive
My 2 transistor overdrive/distortion pedal. I based part of it off some of the lower gain 1 transistor 'grit' pedals and added another transistor to the preamp section to add a bit
Name Some Transistor Circuits With Diode Distortion? (not to ground, and Op-amps need not apply) | TalkBass.com
How to design a basic overdrive pedal circuit - Wampler Pedals