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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Transducers ADC Converter ADC0808 (CB14349E)
The circuit shown is from the National Semiconductor Linear Applications Handbook of 1994. using...
Frequency Calibrator (CB10879E)
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
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Found in a 90s Popular Electronics, this circuit uses a 741 to generate frequencies from 0.1 to 30...