Kit 9: Darkness Detector

Who hasn’t been afraid of the dark at some point? The white light-emitting diode in this circuit automatically switches on at dusk and switches off as the light level increases at dawn. The switching on and off is controlled by the light-dependent resistor and transistor. Please have a look at a working version of the "Darkness Detector" circuit on the Irby Electronics YouTube channel. When this circuit was tested, the light-dependent resistor was covered with black tape to simulate darkness. The Duracell Plus Power 9 volt battery was still producing a good light output after 120 hours of continuous use. The circuit is made on track board (approx. 6 cm x 2 cm) and requires 1 x PP3 battery (not supplied). Soldering is ESSENTIAL for this kit. These tools are needed to make this kit (not supplied): small pliers for bending component leads, small wire cutters for cutting component leads and link wire, 3 mm drill bit or sharp craft knife for breaking the copper track, small, low power soldering iron, e.g. 15 watt, 18 watt or 25 watt. Please read the safety warning in the About Irby Electronics section before ordering a kit.