Simple House Alarm circuit

  
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.

Simple House Alarm circuit - img1

The inportand parts in the circuit are 3 ICs CD4011 which are well known quad2 input nand gates, a timer 555 and the CA3097E.




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