Darkness Monitor (CB21019E)

Found in Popular Electronics this circuit triggers an SCR and lights an LED when the location of the sensor is dark.

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Light Relay (CB19976E)
This circuit activates a relay when the sensor receives light. The sensor can be any common LDR,...
0 to 20 V x 1 A Power Supply (CB1186E)
We found this circuit in a 1980 documentation. With basic changes, including transistors that were...
Wind Detector (CB5155E)
When a small air current reaches the piezoelectric sensor, a small audio signal is generated and...