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 is suggested by a 1965 General Electric documentation. The triac must be in...
We found this circuit in 1980s documentation. It can be used independently as CW or by exciting a...
This 80's Motorola circuit can generate 100 MHz signals, but they can reach 200 MHz with the...