•  
  •  

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.

If there are any problems please contact webmaster@electronic-circuits-diagrams.com

Please share & like

American Crafts We R Memory Keepers PINK Typewriter. Brand New
$149.99 American Crafts We R Memory Keepers PINK Typewriter. Brand New  picture
6GB Kit Kingston 4 X 1GB KVR667D2D8F5K2/2G PC2-5300 DDR2 ECC Server Memory RAM
$15.0 6GB Kit Kingston 4 X 1GB KVR667D2D8F5K2/2G PC2-5300 DDR2 ECC Server Memory RAM picture
New Sealed Box York International 031 01798 001 Program Memory Card
$229.95 New Sealed Box York International 031 01798 001 Program Memory Card  picture
Zig Memory System Wink Of Stella Glitter Marker-Glitter Orange - 12 Pack
$23.05 Zig Memory System Wink Of Stella Glitter Marker-Glitter Orange - 12 Pack picture
Allen-Bradley 1747-M13 (1747-M13) Memory Module
$47.0 Allen-Bradley 1747-M13 (1747-M13) Memory Module picture