4093 Sine Square Converter (CB26335E)

Found in a Popular Electronics from the 90s, this circuit operates up to about 5 MHz input.

Capacitive Alarm (CB12181E)
This approach alarm was found in Radio Electronics from July 1990. The circuit must be powered by a...
Two Speed Motor Control (CB18654E)
This simple motor control for alternating current with triac was obtained in a European...
Infrared Monostable Receiver (CB24831E)
This circuit is designed to be used with the infrared transmitter two circuits before this one....