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 additional bell circuit was found in the February 1994 Electronics Now magazine. The...
This low-frequency circuit for alternating signals is from an early American 1980s documentation. The...
This circuit is from a 1967 US publication. The configuration can serve as a basis for designs...