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741 Light-Dark Sensor



The sensor is LDR its work with changed light. If light resistance will low value and if dark the resistance will up. The main processor is 741 OpAmp operational as comparator. Two input at pin 2 & 3 as comparator inputr The pin 3 as reference be compared by pin 2. The sensitivity operational On or OFF by the light can adjust by reference voltage trough P1.




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