Laser Security System using BC547 Transistor and LDR #security #diy

Apr 14, 2026Channel
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TeknoTrek
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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

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

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