Laser Security Alarm System Circuit Diagram. In this laser security alarm circuit we have used lm358 dual comparator ic for comparing voltages coming from ldr. Laser security alarm system circuit diagram.
The laser pointer is used as the source of light beam. Here ldr placed to sense the laser light from the laser diode. Here ldr placed to sense the laser light from the laser diode.
Laser security alarm circuit produce highly audible buzzer beep sound when the laser light blocked.
The laser pointer is used as the source of light beam. Talking about circuit diagram it is noticed that a tl072 op amp ic1 a is set up as a voltage comparator used in between the adjustable voltage driver p1 r4 and the light dependent voltage which comprises of photodiode d1 and r3 a fixed resistor. Laser door alarm is based on the interruption of laser beam. Normally laser door alarm circuit will have two sections.
