This musical light alarm circuit is very simple, uses only 7 components, a LDR and a 3.6 V battery or 3 x 1.2 volts rechargeable batteries. The well-known UM66 is used as the sound generator and will ...
Streetlights, emergency lights,and security lights must automaticallyturn on when it gets dark. You basethe control circuit on the resistance of aphotoresistor or another LDR (light-dependentresistor) ...
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