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Protective Latching burglar alarm

2016-02-18 03:36  
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Some alarm systems serve a single purpose of burglary protection; combination systems provide bothfire and intrusion protection. Intrusion alarm systems may also be combined with closed-circuit television surveillance systems to automatically record the activities of intruders, and may interface to access control systems forelectrically locked doors. Systems range from small, self-contained noisemakers, to complicated, multi-area systems with computer monitoring and control.Closing the protective circuit (R1 to R2) applies positive voltage to the gate of  SCR1 and sounds the alarm.A vibration sensitive electrical alarm system comprising an electrically conductive pendulum means swingably suspended from an axle member, a pendent body pivotally attached to said axle and having an electrically conductive projection secured to it extending in the direction of said pendulum means, the arrangement being such that when the pendulum means is set into motion, it is adapted to touch said projection whereby an alarm is activated.

 

Latching burglar alarm II 
 

It can only be turned off with SI.