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House Alarm Loop Circuit

2016-02-21 11:42  
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A closed-loop system for monitoring the condition of a person in a residence. A digital dialer-transceiver at the residence is connected to a telephone line and may be triggered by an emergency button or the running out of a timer. It transmits identification and alarm codes to a compatible digital transceiver at a central station and at the same time emits an alarm signal at the residence.This circuit offers open and closed loop contacts (switches 1,2,3) that triggers the alarm ON and stays ON for 5 -10 minutes. The trigering delay (entrance/exit) is 27 seconds. This simple alarm circuit Has also a cancel button for reseting the circuit to stand-by mode again.It uses 4001 and  4011 gates and one NPN transistor who drives the siren.The loop system can be used independently from the entry/exit system. This would be useful if a shed or garage needs to be left open when working in the garden, while still providing protection for valuable bicycles and power tools.

House Alarm Loop Circuit