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.
We found this circuit in an American 1980s documentation. The circuit uses a piezoelectric transducer...
A ring and pendulum of stripped wires form the sensor for this alarm. Once triggered, to reset, you...
Other operational amplifiers in the series, such as the MC34072, MC34074, MC35071, MC35072,...