Preheating circuit (CB7187E)

This circuit was found in a General Electric manual from 1970. Its purpose is to provide a preheat to a filament lamp.

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High Quality Radio (CB23626E)
This 10-transistor radio was found in Radio Electronics magazine from December 1964. The...
100 kHz Crystal Oscillator (CB15658E)
This oscillator uses one of the four ports of a 74C14 integrated circuit and can generate 100 kHz...
Humidity and Rain Alarm (CB17475E)
This simple humidity alarm circuit includes a timed warning oscillator whose time is set to R4....