here for Electronic
Circuits main page
|Timed Burglar Alarm -
Contributed by, Richard Johnson Click here for Circuit Diagram.
N/O - N/C Timed Burglar Alarm
This is a simple but effective alarm circuit which can reset its self after
a time that you select. it has normally open and normally closed triggers which
make this circuit very practical. This alarm has normally open and normally closed triggers. It's on a 555
timer so the alarm will reset it's self after a certain amount of time. The time
is adjustable with the variable resistor in the circuit. The alarm has a reset
switch which you can replace with a key switch to make it more secure, and you
can change the triggers to other types of door or window switched too. The
alarm uses a relay which is connected to a siren but you can replace the siren
with whatever you want. The circuit is running off 9VOLTS but can range from 4V - 16V.
a Circuit | Newsletters
Forum | Links
All the information present on this site are for personal use only. No commercial
use is permitted without the prior permission from authors of this website.
All content on this site is provided as is and without any guarantee on any
kind, implied or otherwise. We cannot be held
responsible for any errors, omissions, or damages
arising out of use of information available on this web site. The content in
this site may contain COPYRIGHTED
information and should not be reproduced in any way without prior permission from
2011 - All rights reserved.