This house alarm circuit has open and closed loop sensor and has self shutdown function. The delay after trigering can be adjusted from 1 minute to 12. The delay before trigering is 13 seconds. Offcourse all this timmings can be change with litle changes to few passive parts.
Datasheet file1: Click here to download CD4001.pdf datasheet. Datasheet file2: Click here to download LM555.pdf datasheet. Datasheet file3: Click here to download CA3097E.pdf datasheet.
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