Found in an old Popular Electronics this circuit can also be adapted to be used as a shield. In this version the control can trigger loads from the light that falls on an LDR.
This simple circuit with sensors formed by bars or separate screens triggers in the presence of...
This simple circuit presents a voltage gain of about 1,500. The input impedance is high and the...
This circuit came out in a Frances Toute LÉlectronique magazine from July 1978, but can still be...