it is derived through a 2N4401 transistor. A 150K variable resistor is used to adjust the sensitivity of the circuit. The circuit can be operated with 9 to 12V DC.















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Here is the project / schematic of LM741 dark sensor relay switch circuit. The circuit will activate the relay switch when there is no light on the surface of LDR. The circuit is built around a LM741 operational amplifier IC. The output of the IC is 25mA, which is not enough to drive the relay directly due to which






 
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Dark Sensor Relay Switch Using LM741