coll circuit

This is a design for guitar effect. This circuit is used for produces fuzz sound, so it is called fuzz effect. This circuit is built by low noise dual op amp IC and transistor. This is the figure of the circuit.


The GEU is good sounding octave fuzz, with an optional mode of just fuzz. The fuzz is a fully rectified signal and is quite chewy. For some the Fuzz alone might not be loud enough, this can be fixed by raising the value of the 820 ohm resistor and lowering the 39k one. Or one could just replace both with a normal volume pot for a more standard approach. The "struzz" is the fuzz with an octave higher signal mixed in. Good for signal notes and leads.

This is the design circuit for guitar effect circuit. This is called as fuzz distortion effect. Based on the squaring property of two back-to-back diodes connected across output and inverting input of the op-amp, IC1B forms a rather straightforward fuzz circuit. The squared output signal coming from IC1B is converted into a triangle-shaped waveform by IC1C and related components. IC1D is wired as a virtual-earth mixer, summing the linear, squared and triangle-shaped signals coming from IC1A, IC1B and IC1C respectively. This is the figure of the circuit;

IC1A is the linear input amplifier. We can vary the input sensitivity of the circuit from -10dB to +10dB in three fixed steps by means of SW1, in order to cope with almost any pick-up type and model. We can done a very accurate mixing of these three different signals by means of P1, P3 and P4. The result will be an almost endless choice of different fuzz-effects.
[Circuit source: redcircuits.com]