Found in a 1968 American documentation, this circuit generates 1 kHz signals. The SCR used is not a common component today.
This light-activated switch triggers a 6 V relay. The circuit can operate with 12 V and relays for...
The source of the figure was found in a 1981 magazine and is recommended for the experimenter's bench. The...
This is the circuit of a digital clock published in the January 1975 issue of Radio Electronics magazine....