This handy little 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.
Schematic-
Parts List-
R1 - 1 - 100K Pot
Q1 - 1 - 2N3904 NPN Transistor
Q2 - 1 - NPN Phototransistor
RELAY - 1 - 9V Relay
MISC - 1 - Board, Wire, 9V Battery Snap (if battery used), Knob For R1
Notes-
1) R1 Adjusts sensitivity
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