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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Unregulated power supply (CB22341E)
This full wave source uses germanium diodes, and its current is a few milliamps. We found it in an...
Low Noise Crystal Oscillator (CB6151E)
This circuit was found in an 80's Electronic Design. The frequency depends on the crystal and the...
Current pulses (CB8936E)
Found in an American publication from 1968, this circuit generates pulses at a rate of 2,500 per...