Overdrive with 741 operational amplifier - H&G Amplifiers
Simple distortion effect circuit. A few parts such as chip TL072 and a few others, and you're done with a simp… | Diy guitar amp, Diy guitar pedal, Distortion pedal
ElectroSmash - MXR Distortion + Circuit Analysis.
Designing the Hard Bargain distortion pedal – Electric Druid
Very Simple and Cheap Guitar/Bass Distortion Pedal | Distortion pedal, Diy guitar amp, Cheap guitars