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 circuit measures the conductivity of a saline solution, which is affected by the electrolysis effect....
With this circuit it is possible to compare the values of two capacitors in the range of 100pF to...
For triggering with the negative transition of the input signal, the circuit indicated for 0 4047...