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.
Several circuits similar to this one can be found on our website. This is from an internet...
This circuit generates a rectangular signal whose frequency depends on the electrolytic...
This circuit locks when the sensors are opened. The relay can be 6 or 12 V depending on the power...