Build Your Own Effect Pedals - Rat (Part 1) Schematic - YouTube
Designing the Hard Bargain distortion pedal – Electric Druid
MXR Distortion + guitar pedal schematic - meaning of +4.5V - Electrical Engineering Stack Exchange
Doctor Pedal - Pedal Effects Dissected
Schematics | General Guitar Gadgets
I plan on building a diy guitar pedal based on this schematic, but I'm not sure what the circled part could be. My electrotechnics profesor told me that I need a Time
A DIY valve overdrive pedal – Goldie – Dave Mac's Window on the World