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

Step 1: Components Required

Light Sensor Circuit/Burglar alarm

Step 2: Basic Circuit

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

Step 3: Practical Circuit

Light Sensor Circuit/Burglar alarm
Connections are shown in the basic circuit previously
 
 

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