How to design a basic overdrive pedal circuit - Wampler Pedals
Build Your Own Effect Pedals - Rat (Part 1) Schematic - YouTube
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
Let's Build a Simple Pedal - A Guitar Boost - Barbarach BC