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.
A flash of light on one sensor or the touch of your fingers on the other type of sensor will turn...
This circuit with only two transistors is from an 80's EDN. It can be implemented with two current...
This high gain small signal amplifier circuit was found in an old publication on transistors....