Capacitive Relay (T1527E)

Found in Popular Electronics from August 1956 this sensitive two-tube relay is powered directly from the mains power supply.

Wudeband Amplifier MC34001 (CB14474E)
The circuit shown is from Motorola's Linear Databook published in 1990. As the CI is uncommon...
Short Circuit Protection (CB17050E)
We found this circuit in a 1997 documentation. It can be used in any common 12 V source and has...
Light Activated AC Switch (CB25875E)
Using a CA3059 this circuit was found in the July 1995 Electronics Now magazine. The triac must be...