Tremolo Effect Circuit for Electric Guitar

 

Tremolo circuit is a kind of sound effect. We can see this type of effect is applied  in guitar effect pedals.  Tremolo effect is produced if we modulate the amplitude of an audio signal. The shape of modulating signal can vary from square wave, sawtooth wave, or sine wave. When we use a square wave, then the effect produce a knocking-like sound which might be perceived like a percussive instrument.

Time Manipulator Circuit

This is a design circuit for a type guitar effect. This circuit can be used as delay, reverb or echo because this circuit is use time manipulator. It uses two PT2399 delay integrated circuits to archive up to 600ms delay. Also, with the help of 4 analog switches, the internal configuration of the pedal can change: placing the PT2399 delay chips in series or parallel and adding extra features. This is the figure of the circuit;

Spring Reverb Schematic Circuit

This is design for guitar reverb. Spring reverb units are most commonly used in guitar amps, having been replaced by digital effects in most other areas.  The circuitry will always be somewhat experimental, and may change quite dramatically depending on the type of spring reverb unit you can actually get your hands on.  The PCB is designed (available soon) to accommodate most reverb tanks, with the optimum being those with a low impedance drive coil. This is the figure of the complete schematic diagram of the Spring Reverb circuit.

Since the P113 headphone amp is very easily modified for constant current drive, this used to be recommended because it works very well.  However, wiring the two halves of the P113 board differently is somewhat clumsy, and while it works well it’s not ideal.  The circuit shown here uses the same drive system, and has everything else that's needed for a complete reverb system.  The circuit shown in Figure 2 is the latest incarnation of the reverb circuit.  Unlike the others that are somewhat 'piecemeal', it's a complete reverb sub-system. 

Fuzz Distortion Circuit with Wave Shaper

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]

A Frequency Doubler Effect for Electric Guitar

This circuit is a octave shifting that is used for electric guitar is done by rectifying the original signal, just like AC to DC conversion inside your AC-DC power supply adapter. This circuit is use single supply instead of symmetric power supply. This is the figure of the circuit.


The rectifying is done by four 1N4148 silicon diodes, configured as full-wave rectifier bridges. Because the bridge is inserted inside the negative feedback of the operational amplifier (op-amp) U1B, the nonlinear characteristic of the diodes around the turn-on point (the forward bias voltage) is compensated by the op-amp’s feedback mechanism. As the result, the output of the rectifier looks like coming from ideal diode with no bias voltage needed. The pre-amp gain can be adjusting by R3 potentiometer between clean and slightly overdriven, hear the effect, and set as you want.

The R4 pot is provided to adjust the processed signal so the output level after the frequency doubling is equal to the level before entering this analog effect processor. Make R7, R8, and C3 layout as close as possible to the pin 10 of the LM324 IC (U1C) with shortest possible wiring to minimize capturing any noise. This voltage (at pin 10 U1) is the reference for internal “virtual ground” coming out from U1C output (pin 8). Make sure that the PCB tracks for this “virtual ground” (pin 8 U1) are wider than other signal tracks to give consistent reference for all op-amps. Make sure C4 and C5 have the shortest possible connection to the power pins (pin 4, pin 11) and the “virtual ground” line (pin 8).

Octaver Fuzz Guitar Effect 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.

Maestro Fuzz Guitar Effect Circuit

This is one of kind guitar effect. This circuit is used for produces loud noise for you guitar sound. This is the figure of the circuit.


The Maestro Fuzz is reputed to be the fuzz used in the recording of the Stones’ "Satisfaction". The transistors are house numbered "991-002298" and the diode is house numbered "919-004799". They are probably all germanium devices. The use of a squelch device is somewhat unique, possibly put there to tame hiss and noise during quiet passages between notes. The two 50K pots which have their wipers connected by resistors are wired so that as one increases, the other decreases, giving a pan from one point in the circuit to another, probably changing the amount of distortion. The last 50K pot is an output level control.