This circuit switches power loads with audio signals. The circuit is from a Popular Electronics from the 90s. The components can be changed depending on the signal used.
This circuit activates a piezoelectric buzzer with an oscillator at the end of the programmed...
In this 1970s receiver, the coil has a primary with 100 turns and a secondary with 20 turns, both...
Found in old American documentation, this circuit is intended for the control of heating elements. The...