Telephone burglar alarm circuit

Published:2011/7/9 9:53:00 Author:Fiona | Keyword: burglar alarm | From:SeekIC

Telephone burglar alarm circuit is shown as above,it is formed by the SCR,relay,NE555 and peripheral components. When the sensor Z is connected, the whole machine is in waiting state,the circuit works. A, B are respectively connected to telephone handfree knob which is stored at pulse dial-up and has the hands free function and the joint of the storage number keys.When the sensor Z is off due to happen stolen situation,the circuit works,A and B are connected,it is equal to off-hook and sending out the storage alarm number (such as 110 or your local phone number).



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