How to make theft preventer alarm

How to make theft preventer alarm

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On: 18 Okt, 2018

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Category: Circuit

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Are you want to add alarm for security reason for your sweet home? If so, you can follow the instruction which visualize with circuit diagram picture will help you more. This circuit utilising a 555 timer IC can be used as an alarm system to preve...

Are you want to add alarm for security reason for your sweet home? If so, you can follow the instruction which visualize with circuit diagram picture will help you more. This circuit utilising a 555 timer IC can be used as an alarm system to prevent the theft of your luggage, burglars breaking into your house etc. The alarms goes ON when a thin wire, usually as thin as a hair is broken.


The circuit is straightforward. It uses a 555 IC wired as an astable multivibrator to produce a tone of frequency of about 1kHz which gives out a shrill noise to scare away the burglar. The wire used to set off the alarm can be made of a thin copper wire like SWG 36 or higher. You can even use single strands of copper form a power cable.The circuit operates on a wide range of voltages from 5V to 15V. The speaker and the circuit could be housed inside a tin can with holes drilled on the speaker side for the sound to come out.

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