Transformerless Wideband Switch (CB6457E)

We found this chopper circuit in a 1967 publication. The transistors are of the time, and current equivalents can be used.

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Relay Control Interface or Shield (CB13108E)
To control relays safely with double insulation through the parallel port, we suggest the circuit in...
Infrared Transmitter (CB22193E)
This '80s circuit drives an infrared LED, producing a modulated signal. Modern higher power LEDs...
3-Transistor Pocket Radio (CB23564E)
This small receiver for the medium wave range was found in Radio Electronics magazine from July...