Extreme 3-Voiced Fuzz Circuit PUBLIC

Extreme 3-Voiced Fuzz Circuit for Electric Guitar

Extreme 3-Voiced Diode-Fuzz Circuit with 3-Band Tone. Uses two dual FET-input op-amp ICs and twenty diodes, along with a modified Fender-style tone-stack. The Input stage features an op-amp configured as a unity-gain buffer whose signal goes to a Driver Stage then to the Diode Matrix, then to a Gain Stage, then to an Output Buffer. Each diode array has its own type of diode. Mellow fuzz is from germanium diodes. Intense fuzz is from Schottky diodes. And Normal fuzz is from standard silicon diodes. The Diode Matrix has an enable switch, and each array has its own enable switch and its own pair of Symmetry switches (which set the harmonic content of its fuzz). There is also a Fuzz Tone control with three selectable high-cutoff settings, attenuation pots called Grit and Clip, and a Fuzz Depth control. Overall, controls are labeled: Input Attenuation, Input Gain, Fuzz Enable switch, Fuzz Grit, Fuzz Clip, Fuzz Tone enable switch, Fuzz Tone Range switch (3 settings), Fuzz Tone, Mellow Fuzz enable switch plus symmetry switches, Intense Fuzz enable switch plus symmetry switches, Normal Fuzz enable switch plus symmetry switches, Fuzz Clip, Treble Trim, Bass Trim, Bass, Mid, Treble, Stack Sum, Output Gain, and Volume. Range above 0 dBV is from 15 Hz to > 20 kHz, with emphasis between 40 Hz and 4 kHz. Suitable for 6/7/8-string guitar or 4/5/6-string bass. Maximum gain with fuzz OFF and all controls at 50% is +41.3 dBV (Vo/Vi = 116) @ 1 kHz, +70 dBV (Vo/Vi = 3162) @ 1 kHz with all controls at 100%. Maximum gain with fuzz ON and all controls at 50% is reduced by the shunting from the diodes to +32.3 dBV (Vo/Vi = 41.2) @ 515 Hz, or +61 dBV (Vo/Vi = 1122) @ 1 kHz with all controls at 100%. Hence, this is a high-gain fuzz circuit. Power-supply not shown. Requires a regulated dual-polarity DC supply providing +-9VDC or +-12VDC or +-15VDC at >= 60 mA of current. Though simulator verified, view the circuit as experimental in nature. Breadboard test it before committing to a soldered build. House the completed project in a grounded metal enclosure.