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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Switching Regulator (CB5450E)
This switching regulator circuit with less than 100 mV ripple was found in a 1980s documentation. The...
Gun Sounds Generator (CB4626E)
The UM3562 integrated circuit is a dedicated circuit found in many toys because it generates three types...
Current Regulator LM117 (CB19832E)
The circuit has the traditional configuration that can be found elsewhere on this site. This is...