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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Lock Timer (CB5980E)
It is like to the previous circuit with a lock that keeps the LED on at the end of the timer. The...
Ladder Generator (CB15660E)
The presented circuit generates a signal in the form of a ladder that can be useful for surveying the...
Charge and Discharge Current Sensor (CB5256E)
This 2005 Linear Technology circuit has separate outputs for monitoring the charge and discharge...