•  
  •  

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

PHILIPS ADVANCE ICN-2P60-N F96T12 120V to 277V Ballast
$17.99 PHILIPS ADVANCE ICN-2P60-N F96T12 120V to 277V Ballast picture
Lot of 11 NEW Phillips IOP-2P32-N Advance Optanium Electronic Ballast 120-277V
$29.95 Lot of 11 NEW Phillips IOP-2P32-N Advance Optanium Electronic Ballast 120-277V  picture
Advance 71A8172-001D/94 Core & Coil Ballast Kit
$65.0 Advance 71A8172-001D/94 Core & Coil Ballast Kit picture
NEW Universal 737-LR-SLH-TC-P Rapid Start Ballast 277V
$49.99 NEW Universal 737-LR-SLH-TC-P Rapid Start Ballast 277V picture
NEW Advance VH-2B13-TP-W Preheat Ballast 277V NIB
$34.99 NEW Advance VH-2B13-TP-W Preheat Ballast 277V NIB picture