SCR photo control (CB8276E)

This circuit is from a 1968 Electronics World. It acts directly on a high voltage alternating current relay. The sensor can be a common LDR.

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Continuity Test (CB22130E)
This circuit can be powered by 2 or 3 small batteries. The resistor can have values between 220...
Two White Noise Generators (CB25710E)
These circuits from a May 1994 Electronics Now take advantage of the noise from the junctions of...
Passive Bass and Treble Control (CB25700E)
This network can be used in a sound project to control the tone. The circuit is from an...