Fuzz-box circuit


Posted on Dec 26, 2012

This circuit was designed to obtain a valve-like distorted sound from an electric guitar or other musical instrument. For this purpose a very high gain, three-FET amplifier circuit, was used. The output square wave shows marked rounded corners, typical of valve-circuits when driven into saturation.


Fuzz-box circuit
Click here to download the full size of the above Circuit.

Technical data: Input sensitivity: 30mV RMS. Output square wave: 6V peak-to-peak max. Total current drawing: about 1mA. Circuit set-up using oscilloscope and sine wave generator: Connect a 1KHz sine wave generator to J1 and the oscilloscope to J2.




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