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0:06
YouTube
MAKING PCB 3D
Simple Laser Security Alarm System Using LDR & BC547 | Mini Project
In this video, we show a Simple Laser Security Alarm System using an LDR and BC547 transistor. When the laser beam is interrupted, the buzzer turns ON instantly and gives an alert. This project is low cost, easy to build, and perfect for beginners. It can be used for home, door, or bike security. The circuit uses a 3.7V battery, laser module ...
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