Scientrox Laser Security System Circuit Diagram on PCB for Multipurpose Use Educational Electronic Hobby Kit

An LDR is a component that has a (variable) resistance that changes with the light intensity that falls upon it. This allows them to be used in light sensing circuits. Now Security is main concern for various buildings, houses and offices. For this purpose, there are a variety of security alarms available in market which uses various types of technology for intruder detection like infrared sensors, motion sensors, ultrasonic sensors, laser sensors, etc. this is laser alarm security sensor,