LASER BURGLAR ALARM CIRCUIT


Posted on Feb 5, 2014

This circuit alarms whenever someone cross the Laser beam transmitted from a LASER. The output of IC TL071 goes high whenever their is no Light(Laser) Ray. This output voltage is further amplified by means of a NPN transistor Q2, which will drive the buzzer and generates an alarm. As i mentioned above, you can use an ordinary Laser as Transmitter


LASER BURGLAR ALARM CIRCUIT
Click here to download the full size of the above Circuit.

and the circuit shown in the figure act as Receiver. The sensing or receivng part of this circuit consisting of a PhotoTransistor L14F1. It will detect Laser Beam and the output is given to IC TL071. Whenever an intruder cross or cuts the ray the circuit alarms.




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