Audio Cable Tester (CB3827E)

This simple circuit tests both monophonic and other two-wire audio cables. The circuit is powered by two common batteries.

Receiver For Infrared Remote Control (CB10007E)
This 2000 circuit can work with one of the many infrared remote-control transmitters described in this...
Front detector (CB9688E)
Found in American documentation from the 90s, this CMOS circuit detects the source of a signal and can...
Insulated dialer (CB9464E)
This circuit was found in an 80's Electronic Engineering. The circuit uses a multivibrator with...