This fuzz gives a fat and tight sound with much sustain until the built-in gate cuts it off. The threshold is set by the "SENSITIVITY" control. It is perfect for melodies and solos.

The circuit is designed for low level input, but can easily be changed to line level signals: The 47pF capacitor should be replaced with a 470 pF, and the 1 Mohm feedback resistor should be on 100 kohm.

The supply voltages could be from +-5 V to +-18 V. The IC could be almost every dual OP-amp, TL 072 works well.