AC Tachometer (CB9353E)

This circuit was found in a 1969 EEE. It detects when there is a phase failure in a circuit using an inductive sensor.

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Q Multiplier (CIR916E)
Factor Q measures the selectivirty of a resonant circuit and also receivers. This circuits cen...
Brake and direction indicator (CB7118E)
This circuit was suggested by Popular Electronics from the 90s. The circuit is quite simple using...
164 V neon regulated power supply (CB8666E)
Found in a 1969 neon lamp publication, this circuit provides two voltages under very-low currents....