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 consists of an ultrasonic transmitter for alarm found in an Italian magazine...
With this oscillator we can obtain a signal of 10 W of power at the frequency of 100kHz. The...
Found in a 90s EDN, this circuit uses components from that time. The circuit supplies a current of...