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0:06
YouTube
MW Electronics Lab
Laser Security System Using LDR and BC547 Transistor #security
In this video, I’ve made a simple laser security alarm using a BC547 transistor, LDR, buzzer, and a 3.7V battery. When the laser beam is blocked, the buzzer instantly turns ON, triggering the alarm. This is a great mini project for beginners to learn about light sensors and transistors. Perfect for home safety, school projects, or electronics ...
2.9M views
1 month ago
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