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 circuit uses an infrared remote-control sensor found on televisions. The circuit can control...
We found this circuit in a 1971 documentation. The circuit can be assembled with more modern...
This circuit is intended to manipulate a transmitter (CW) from coded audio signals recorded on a...