Easy Laser Security System
This is a less cost and easy laser security system.
Circuit Diagram
This is very easy laser security system.to built this we need ,
LED
LDR
100ohms , 6.8k resisters
2n 7000 transistor
3v buzzer
9v battery
Small switch
Laser pointer
PCB board
Wire
Pen grip
LED
LDR
100ohms , 6.8k resisters
2n 7000 transistor
3v buzzer
9v battery
Small switch
Laser pointer
PCB board
Wire
Pen grip
Build the Circuit
Place the Circuit
LDR is the main part of this circuit. Cover the LDR with the pen grip , because when other lights appear to the LDR it is not working good.When the switch on the LED is glowing and buzzer is working. When the laser's light appear to covered LDR the LED and buzzer is stop working. And something go through the laser's light the LED and the buzzer is working.