A durable alarm circuit

Published:2011/7/8 20:14:00 Author:Seven | Keyword: durable alarm | From:SeekIC

Many citizens have additional storerooms, as the storeroom is not at the same side with the living room, so it's not easy to realize when it is pried or the motor is stolen.Here is to introduce a storage door alarm, one wire of the alarm's is from the living room to the storeroom, as long as the owner close the door and turn on the alarm, whether it is pried or the external wire is cut off or short, the alarm will make the alarm sound.



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