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Fuzz is one of the classic guitar effects, and this simple circuit generates it quite well. The circuit is so compact that it can be built into guitars or amps that do not have built in fuzz to add that capability to the instrument. The circuit does not use much battery power, so a standard alkaline battery will last many years even with daily use.

R1, R22100K 1/4W Resistor R311K 1/4W Resistor R411M 1/4W Resistor C11100uF 16V Electrolytic Capacitor C2, C320.47uF Ceramic Disc Capcitor D1, D221N4148 Diode U11741 Op Amp MISC1Socket for U1, Jacks for Input/Output, Wire, Board, 9V Battery Snap, Case