How to make a Laser Security Alarm / Sinhala

Опубликовано: 08 Август 2026
на канале: Sayuru tech

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How to make a Laser Security Alarm / Sinhala

Required Materials

BC 547 Transistor
LDR
1.5k Ohm resistor
Buzzer
Laser
9V Battery
9V Battery Connector
Card Board

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