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 activates a relay when the water reaches the sensors. The circuit is from a magazine...
The circuit, from Motorola's 1993 Linear Interface ICs, uses an unusual operating system today....
Decade counters, such as the 4017, can be cascaded as sourcing signals with the frequency divided...