Posted by Tittu Thomas , 7/04/2012
SIMPLE LASER BURGLAR ALARM CIRCUIT
It is an advanced, simple, efficient and low cost circuit. You can use this circuit on Home, office, locker or anywhere for Security purpose.
As the name suggests, the circuit is based on Laser. We all know about the features of Laser, Long Range, pointed beam, Low power consumption and so on.
The Transmitter section of this circuit is a LASER.
Circuit Diagram of Laser Burglar Alarm
Components Used In Laser Burglar alarm circuit
T1 L14F1 (Photo Transistor)
T2 BC 548
Working of Laser Intruder/Burglar Alarm Circuit.
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.
How to Setup Laser Burglar Alarm?
As i mentioned above, you can use an ordinary Laser as Transmitter 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.
ADVANTAGES OF THIS CIRCUIT COMPARED TO OTHER SECURITY CIRCUITS
The circuit is quite simple to Do. (You can try this circuit for your project also)
Lasers Having Long range, so we can cover a long area to prevent the access of Intruders or robbers
Commonly Available Components
Laser Diode working Principle
Categories: Alarm, Burglar, projects