How to make a Laser Tripwire Alarm Circuit on a Breadboard [HD] 

In this tutorial I will show you how to make your own "Laser Security Alarm System" or a "Laser Sensor" on breadboard. This is similar to my previous video "Dark Sensor."
Its awesome once you complete the circuit and fun to play with. You can make this Laser Tripwire Alarm and protect your room from intruders :D You can even add multiple mirrors from different angles and focus it on the LDR for a greater effect.
COMPONENTS REQUIRED:- LDR, L.E.D, BC547 Transistor, 100k ohm resistor, 9v Battery, Buzzer & Breadboard.
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