We found this circuit in a 1966 US documentation. It simulates a variable capacitor that can vary capacitance from 1,000 to 1. Transistors are general purpose types.
This circuit only detects variations in light falling on the sensor. The circuit uses an LM380 as a...
This is the well-known lightning lamp that was published in the March 1988 issue of Saber...
This photoelectric cell light relay was found in Radio Electronics magazine from April 1958. The...