security door alarm circuit diagram

Hello, today I will show you how to make a security door alarm, the door alarm is easy to make and give the best result.

The door security alarm provides a very long battery life and easy installation, the circuit use only 2.4 volts to operate so you can power the circuit with 2xAA rechargeable battery or even you can use a lithium-ion battery with auto charging circuit as power supply because the circuit can withstand up to 5 volts power supply. 

If you want to change the power supply to 12 volts, you simply need 7805 IC to regulate 12 volts to 5 volts without any problem. You also can use 12 volts Buzzer instead 5 volts Buzzer that I used in the circuit and connect directly to 12 volts power supply (solar charger's output, 12 volts car battery).
The SCR (thyristor) in this circuit can withstand current up to 3 A so you can connect 20 Buzzers (estimate 100 milliamp/hour per Buzzer) with one circuit module without making any damage to The SCR. You also can change the SCR model if you want smaller circuit.

Component list
5 volts Buzzer
1 kilo-ohms resistor
3 leg limit switch
SCR 3p6mh (You can use another SCR model without any problem just check K, A, G pin is correctly used)

Door security alarm circuit diagram

Door security alarm working and circuit explain 

Feel free to ask any question about my project in comment box below

Comments

  1. This comment has been removed by a blog administrator.

    ReplyDelete

Post a Comment

Popular posts from this blog

How to add power supply filter capacitor to amplifier board.

5 watts amplifier TDA7056A wiring diagram

How to connect volume control to an amplifier

PAM 8403 board amp wiring diagram

10 watts 8 ohms class d amplifier pam8610 sound test

Hall effect sensor wiring diagram and test video

simple bass booster circuit diagram

tda 7052B full wiring diagram, easy to understand

how to make condenser microphone pre-amplifier

3 watts stereo amp board pam8403 sound test with jvc loudspeaker.