Posted on Feb 5, 2014

Two diodes in feedback path or LM324 opamp create musical-instrument effect known as fuzz by limiting output voltage swing to ±0. 7 V. Resultant square wave contains chiefly odd harmonics, resembling sounds of clarinet. Fuzz depth pot controls level at which clipping begins, and fuzz intensity pot controls output level. - Audio Handbook, National

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Semiconductor. Santa Clara. CA. 1977. p 5-11.

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