Wired security alarm


The security circuit posted here is a simple wire trap system, if the wire from “A” to “B” is broken, the buzzer that is connected to pin 3 of the ic will start “beeping” continuously!. Use a tiny copper wire as Trap wire,so the wire will easily break when someone try to enter to the area where this trap wire is placed.

how it works!

An NE555 timer ic is used here as a “Free running oscillator, since the “pin 4” is connected to negative (GND) of the circuit, the buzzer will not work because the IC is disabled by the “Trap wire”, so if the trap wire is broken, the ic will be enabled and the buzzer will beep. You may attach a high volume alarm to pin3 of the ic instead of buzzer so it will help you to know that your property is going to be robbed even if you are sleeping, due to the high sound of the alarm, a siren can be used for best sound performance. U can use a 9V battery for the easy use of this circuit


circuit diagram of wire trap circuit.

Components you need

R1 – 47K

R2 – 100K

R3 – 4.7k (4k7)

C1 – 10V/1000uf

IC – NE555

9V battery and its holder (if needed)

9V buzzer or siren (might need modification in the circuit if you want to use a high power siren)

need any help? just add a comment below!

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About Ztronn

hellooo i'm lsid ,i am a DIY (do it yourself) stuff loving kinda guy, i mean i love to build things and posting it on my blogs for the world to see. i love reading about technology and innovation. i love the nature,mysteries of space and of course God. no aliens. kindly let me know what you think about my simple innovations in the comments.
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3 Responses to Wired security alarm

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  2. loneziddik says:

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