I bought a kit from Mammoth Electronics based on GuitarPCB.com’s “ODC” kit. Dealing with Mammoth was a nightmare as they sent incorrect parts with little to no communication over the course of two months. Lesson learned: Source your own components from somewhere like PedalPartsPlus.
GuitarPCB is a great company and super helpful. After scrounging around multiple RadioShacks I ended up with a pedal that works OK. I think it still needs some debugging as the LP/HP switch doesn’t do anything noticeable and the tone circuit sounds bypassed (probably due to poor soldering).
The circuit board is meant to simulate the overdrive from Fulltone’s Obsessive Compulsive Drive pedal. Sounds great… hoping to get some audio clips up soon.