This current switch was found in a Radio Electronics from November 1957. It triggers the current determined by the electromechanical sensor, a polarized relay of the time.
This circuit uses unijunction transistors and drives a small speaker through an output...
This interesting game was found in a 1987 publication, but it is very simple and can be easily...
This circuit uses a thermistor or NTC as a temperature sensor and provides the indication on an...