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.
In the figure we have the circuit of an amplifier for alternating signals with 10 times gain,...
We found this circuit in a documentation on active filters from 1977. The gain of this circuit is...
Figure bellow shows a ring oscillator using five inverters of a 4049. [The circuit operates only...