Found in a 1967 General Electric SCR manual, this circuit triggers in case of excess current, causing the fuse to blow or a circuit breaker to open. The components are from the era.
This circuit increases the sensitivity of a multimeter in the measure of small alternating...
This circuit triggers a buzzer or other warning device when the light falling on the sensor is cut...
This circuit open and close the relay in intervals adjusted by the potentiometers. The capacitors...