In play guitar or other instruments. Sometimes people just want to be a sound of unusual instruments, from some common. and this fuzz box effect circuit or crack, it is the circuit that is commonly used characteristics as shown in Figure 1.

How this circuit works

In Figure 1 as circuit diagram of this project, we use IC-741 op-amp as base of circuit by it is new setting to use a single power supply to easy to operation.

The Figure 1 is the schematic of this project.

The input signal is fed to C1 to pin 3 of IC1. Which this have gain equals value of (VR1+R2+R3)/R2. And the gain change since 6-92 Depending on the adjusting VR1.

However, the output voltage is less than 600mV. Since connecting both diode D1-D2 in feedback circuit and connecting a signal attenuation circuit by R6, R7. Therefore the signal output from the IC was down to only 150mV.

How to builds

In the building circuit we can use a perforated board or a normal PCB as Figure 2 is actual-size of single-sided copper PCB layout and assemble parts on PCB as Figure 3

Figure 2 the copper layout

Figure 3 the component layout

For switch-S1 is available to choose. Will continue to play with the direct signal or the signal through the circuit.

Parts you will need.
IC1_______LM741 single op-amp or LF351 better low noise fet op-amp.
D1,D2_____1N4148
R1________100K Resistors 0.25W
R2________1.2K Resistors 0.25W
R3,R4,R5__10K Resistors 0.25W
R6______3.3K Resistors 0.25W
R7______1K Resistors 0.25W
C1,C3___0.1uF(104) 50V Ceramic or Mylar capacitors
C2_____10uF 16V or 10/16V Electrolytic capacitors

Fuzz pedal schematic

This is Fuzz audio converter circuit. By using diode 2 pcs. in a feedback circuit of OP-AMP IC, number LM324. I make for build way music sound that has unusual characteristics. By limit output voltage, give a hand net between 0.7Vp-p waves square signal that is the result that is will proportionate big compose harmonic be the odd number, resemble the sound of a donkey.

The Resistor at use fine the depth of fuzzy audio. It will use fine the level that wants to is born top waves slitting goes up. And the resistor at use fine the intensity of output signal.

Signal Automatic Fader using LF351

This is a Control signal Automatic Fader circuit. It helps to adjust decorate or control sound signal highly or low follow want. In model the automatic convenient for the system electricity guitar , side sound of music work. By this circuit uses FET , then have tall rapidity , there is the crazy low and use IC op-amp model FET , number LF351. Then have disturb lower. The S1 for fine the pitch High or Low get, and have fining decorates the pitch done to a turn VR1,VR2 you can the detail adds in the circuit.