Schematics > Security and other sensors and detectors > Theft preventer alarm
Theft preventer alarm
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.
Title: Theft preventer alarm
Source: www.electronic-circuits-diagrams.com
Published on: 2005-02-01
Reads: 597
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