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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Dual Frequency Oscillator (CB13022E)
The LM567 is a PLL tone decoder that can also be used as a double oscillator as shown in the...
Light pulse analyzer (CB8300E)
Originally designed to analyze the shape of light pulses from a flash for photographic...
Two Power Loads by One Cable Control (CB19044E)
This interesting control circuit was found in an Electronics Now from 1988. Through it we can...