Found on a 1969 EDN this circuit switches a current from a digital control signal. The impedance of the circuit ON is approximately 10 ohms. Modern equivalent transistors may be used.
This simple test circuit was found in the April 1983 issue of Radio Electronics magazine. The...
This circuit for 6 lamps was found in old American documentation. The supply is of high voltage...
This sensitive three-transistor circuit was found in Electronics Now magazine and is...