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.
According to its author, this device indicates the amount of force applied to the sensors. The...
This circuit was found in an English magazine Radio & Electronics Constructor of February 1977....
August 2017 - TPS4H00EVM Power Module Modules for Texas Instruments High Power Positive Side...