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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2 6GHz Oscillator (CB21198E)
Found in Popular Electronics from the 90s, this circuit is intended for a radar emitting pistol. The...
CMOS Oscillator Using the 4002 (CB898E)
This circuit can generate signals up to 5 MHz according the power supply voltage. Frequency is...
Bug Transmitter (CB21880E)
This transmitter emits a modulated signal at a frequency given by the first transistor in the...