Gas ignition (CB7075E)

This circuit for igniting gas flames was found in a 1967 Electronic Design. The SCR firing device is a gas lamp of the time.

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Wireless Alarm (CB12600E)
This circuit, from a 1978 publication, emits a modulated signal when the fine sensor is...
Electronic Ring Bell using an UJT (CB439)
This circuit uses two oscillators to produce a sound that seems the sound of a ring-bell. The...
LED control (CB7194E)
This circuit for controlling high power LEDs (up to 2A) is from a General Electric documentation from...