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.
The first configuration we show is a flip-flop that can be triggered using two push buttons of the...
This circuit is used for cable checking. We found it in the Radio Electronics magazine of December...
This interesting circuit causes a set of LEDs to flash at a speed controlled by the CI1 in an...