4093 Sine Square Converter (CB26335E)

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

Full cup detector (CB6956E)
This circuit was found in Popular Electronics. Its purpose is to warn the visually impaired when a glass...
Transmitter for remote control (CB21645E)
This circuit was obtained from a Popular Electronics from January 1967. It has a...
Ultrasonic Transmitter (CB18476E)
This ultrasonic transmitter was found in a 1974 documentation. The receiver is the CIR11753 or...