Mạch cảnh báo bằng laze - How to make Laser Security (Theft) Alarm using SCR - 1 KM Range

 

Required Components:-

1) C106MG SCR (silicon-controlled rectifier)

2) 680 ohm Resistor

3) 100uF 25V Capacitor

4) Laser Module

5) LDR Sensor

6) 5V Buzzer

7) Push to OFF switch (Normally Close)