Alarm Clock Countdown - Search Videos

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

YouTubeTeknoTrek

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

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 ...

21.1K views1 month ago

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