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Simple Burglar Alarm

2015-01-08 13:21  
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You can use this Simple Alarm to protect the door or Window. It gives a loud beep and switch on the room light when an intruder/burglar attempts to breaks the door lock.Aburglar alarm is a system designedto detect intrusion – unauthorized entry – into a building or area. They are also called security alarms, security systems.Using one IC and a driver transistor, this simple alarm uses either NO or NC sensors. When a sensor operates, the input to U1A goes low, causing U1A to go high, U1B low, and U1C high. This biases Q1 ON and activates relay Kl. On/off is via keyswitch SI.Burglar alarmsare found in every retail store and arebecoming more common in private homes. Find out how a simpleburglar alarmsystem works.

 

Simple Burglar Alarm