Phase detector (CB8155E)

This circuit was found in a 1967 Electronic Design. The FET is from that time. Capacitor C is determined by the frequency of the signal worked.

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Robot Eyes (CB12397E)
Found in a 1990 Electronics Handbook, this circuit causes an LED to flash when the phototransistor receives...
Window Comparator (CB25732E)
The circuit shown in the figure is recommended for applications where a visual indication is...
Piezoelectric Transducer Manual Siren (CB15858E)
This circuit is a siren with manual modulation that, instead of exciting a speaker, excites...