Burglar alarm
Burglar alarms, which employ an electrically energized circuit, have become very popular in residential sections to signal to the police or private agencies that a particular residence has been broken into. The alarm systems also act as a deterrent such that when the alarm is activated. Various alarm apparatus systems are invented and produced to fulfill the necessity arisen from the experiences that those expensive devices have been lost. There are many different ways to activate an alarm system by using different type of sensors or radio communication devices. There are two major categories of burglar alarm systems: perimeter protectors and motion detectors. Motion detectors employ an energy transmitter and receiver to establish an energy path which is broken by an object passing therethrough, resulting in the sounding of some form of alarm. Motion detectors utilizing visible light, ultrasonic energy, infrared radiation and microwave have all been marketed. Devices for securing a building, an office, a home and other such immobile objects have often employed alarms based on an interference occurring in an electromagnetic radiation field (infrared, visible light) or a microwave field. Normally, the alarm systems produce either an audible or visual signal, or turn on lights or the like when activated by some means. A regular wireless burglar alarm system is generally comprised of a transmitter and a receiver. The transmitter and the receiver comprise a respective power circuit, and a respective power on/off switch controlling the respective power circuit.
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