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Alarm triggers on after a 13 second delay and stays on for 1-1 Vfe minutes. Then it resets automatically It can also be turned off and reset by opening and reclosing SI. Automotive Burglar Alarm Circuit Diagram

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 IC TLO71 T1 L14F1 (Photo Transistor) T2 BC 548 R1 1KΩ R2 4.7KΩ R3 4.7KΩ R4 100Ω C1 470μF C2 1000μF LED Buzzer 9V Battery 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...

Burglar alarm circuit or Theft alarm circuits are available in several forms. The above circuit was one of that kind using timer IC 555 as the main component. The circuit is very easy to construct and the cost of this circuit is also very less. So we can implement this circuit by our own and install this circuit in our home so that you can improve your knowledge and it also adds protection to your home. Using IC 555 Burglar Alarm Circuit Diagram The working of this circuit is very easy to understand.In the above circuit IC 555 was used as a Astable multivibrator.The Astable multivibrator puts out a continuous stream of rectangular pulses having a specified frequency. Thus by using the Astable multivibrator we can produce continuous frequency which was given as input to the speaker which makes an alarm sound in case of any disturbance in its trip wire. Pin diagram of IC 555 was given below for your better understanding. Now we can see how we can change the Astable Multivibrator to a ala...