Laser Security System using BC547 Transistor and LDR #security #diy
Apr 14, 2026•Channel
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Video Overview
Video Details
Published1 month ago
Duration0:15
Video IDIn_lhFhnt68
Languageen
CategoryScience & Technology
PrivacyPublic
Made for KidsNo
Video TypeRegular Video
Performance Metrics
Views20.5K
Likes221
Comments0
Engagement Rate1.08%
Likes per 100 views1.08
Comments per 1K views0.00
Video Tags
#laser security system#laser alarm#diy laser security system#laser security alarm project#ldr laser alarm#bc547 transistor project#ldr sensor project#simple security system#diy alarm circuit#laser beam alarm#home security diy#electronics mini project#beginner electronics project#transistor based alarm#ldr circuit#light sensor alarm#no arduino projects#simple electronics circuit#diy security alarm#buzzer alarm circuit
Description
In this video, I’ve built a simple laser security alarm using a BC547 transistor, LDR, buzzer, and a 3.7V battery. When the laser beam is interrupted or blocked, the buzzer instantly turns ON, activating the alarm system.
This is an easy DIY electronics project for beginners to understand how LDR sensors and transistors work together. Perfect for home security ideas, school projects, or basic electronics experiments.
⚡ Powered by a single 18650 Li-ion battery and works without Arduino!
Components Used:
BC547 Transistor
LDR (Light Dependent Resistor)
Buzzer
1k Resistor
Laser Module (3V)
3.7V Battery
#shorts #laser #security #electronics #DIY #LDR #transistor #alarm #circuit #tec