Lie Detector (T1534E)

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

Missing Pulse Detector (CB4828E)
This circuit appears several times in this section and on this site, obtained from different...
Light beam modulator (CB8023E)
This circuit was found in a General Electric documentation from 1970. Equivalent transistors can be...
Alarm Sensor (CB15000E)
The circuit shown consists of a NO and NC sensor system for alarms. The output must be connected to a...