Lie Detector (T1534E)

This circuit was found in a Popular Electronics from December 1956. Power is provided by batteries.

Function generator (CB6994E)
This circuit was found in 1980s Radio Electronics. The circuit includes the power supply. The...
Windscreen Wiper Interval timer (CB6043E)
This circuit was found in a former Popular Electronics. The timing is set on the potentiometer and the...
Battery Status Test (CB4581E)
This circuit has appeared on our site several times as a battery status monitor. In this...