Light and Dark Detector Circuit Diagram
Simple Electronic Applications December 7th, 2009This simple circuit can tell the difference between darkness and light, making it very useful for switching on and off signs, porch lights or other things when it gets dark or light. this circuit control the relay that will be switching if there are any difference between darkness and light.
parts :
R1————————————- 100K (to adjust sensitivity)
Q1————————————-2N3904 NPN or 2N2222
Q2————————————-NPN phototransistor
9V relay, 9V battery, supporting tools
source : www.aaroncake.net
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