Laser Security System Using LDR and BC547 Transistor #security

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Added 9 hours ago by admin

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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 experiments.
⚡ Powered by a single 18650 cell and works without Arduino!

Components Used:

BC547 Transistor

LDR (Light Dependent Resistor)

Buzzer

1k Resistor

Laser Module (3V)

3.7V Battery