This fuzz effect for guitars was found in an American 1980s documentation. The transistors may be the BC549 and should be battery powered for noise sensitivity. Diodes are commonly used.
This circuit was found in 1980s Electronic Engineering. Transistors can be modern equivalents. The...
In this National Semiconductor circuit, the output voltage is numerically equal to the square root...
Found in documentation from the 1980s, this circuit uses an operational amplifier from that time....