Very Simple and Cheap Guitar/Bass Distortion Pedal : 4 Steps - Instructables
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
How to design a basic overdrive pedal circuit - Wampler Pedals
Index of /diy/Schematics/Distortion Boost and Overdrive
Transistor-based Overdrive | Delicious Audio
2n3904 circuit: Metal Simplex Fuzz - Siliface
Daredevil Pedals Premium Overdrive Transistor Overdrive – Chicago Music Exchange
Experimenting with the Pedal - DIY Guitar Effect - Barbarach BC