1. PRESENTED BY ,
R.& T.VIGNESH,
B. DEEPAK RAJA
GUIDED BY,
MR.R.CAROL PRAVEEN

2. OUTLINE:-
INTRODUCTION
CIRCUIT DIAGRAM
WORKING
APPLICATION
ADVANTAGES

3. INTRODUCTION:- SECURITY ALARMS are electronic alarms designed to
Alert the user to a specific danger
Security alarms have become standard equipment
used in stores and other businesses
This circuit works in 12v dc supply

4. CIRCUIT DIAGRAM:-

5. COMPONENT INFORMATION:-

6. WORKING:- The circuit is built around quad NOR gate IC CD4001
Reed switch Rs1 and magnet is placed together And act as the sensing unit
Magnet is fixed in the door and the switch is placed in the door frame
When the door is close, switch rs1 is also open then the 12v supply is extended to the circuit ,
The output gate N2 of IC1 is in logic low state

7. When the door open ,switch is also opens and
the output state changes to the logic high,
enables the bistable latch realised using gates N1 and N3 as results transistor T1 activates to drive alarm
push to on type switch is used to reset the alarm .
working of the circuit is straight forward
when someone opens the door switch rs1 also opens and the alarm raised
.the alarm remains enable even the door is closed .
the alarm turned off once switch s1 is pressed.

9. ADVANTAGES:-
Low cost
Easy to manufacture
Less complexity
Easy to replace

10. FUTURE SCOPE:-
We can further modify this circuit by inserting an GSM in this circuit to send SMS alert the person.
We can use the camera to take the snapshoot of the thief
Automatic door closing

11. By,
T.&R.VIGNESH
B.DEEPAK RAJA