Light Sensor Circuit/Burglar Alarm

by sabarna in Circuits > Sensors

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Light Sensor Circuit/Burglar Alarm

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It is a Light Sensor Circuit.With little modifications it can be turned into Burglar Alarm Circuit.

Components Required

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Basic Circuit

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Principle:The buzzer rings as long as light falls on LDR.but when LDR comes into darkness the alarm stops.

Practical Circuit

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Connections are shown in the basic circuit previously