A Simple D.I.Y. Fuzz Box Project

A simple fuzz box comprises an operational amplifier (op amp) and diode “clippers.” The amplifier’s gain range is unity (no gain), ±6 dB. The circuit is only designed to drive the diodes until they conduct, causing clipping. A separate amplifier would be used to optimize the instrument interface. An op amp has two audio (AC) signal inputs: non-inverting (+) and inverting (-); the former is grounded in this application. Color-coded sine waves in and out confirm polarity inversion and the respective diodes responsible for “damaging” each wave half. An op amp has two power inputs, as well. For simplicity, this circuit runs on bipolar power. (Most stomp boxes run on a single 9-volt battery.)