Projects

LITTLE DOOR GUARD

 If some intruder tries to open the door of your house, this circuit

 
sounds an alarm to alert you against the attempted intrusion.
 
The circuit (Fig. 1) uses readily available, low-cost components.
 
For compactness, an alkaline 12V battery is used for
 
powering the unit. Input DC supply is further regulated to a steady
 
DC voltage of 5V by 3-pin regulator IC 7805 (IC2).


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