Instructables
video $5 Dollar Burglar Alarm!
I made a Burglar Alarm for under 5 bucks, and items I found laying around the house! No soldering required. (soldering optional)
ramirolzek4 years ago
Seems so simple! It will be very useful tip  to <a href="http://www.800amalarm.com">alarm system install companies </a>.
 

Kaiven5 years ago
LOL I have done that before with a plastic cd case!
1435 years ago
yarrrrrr how to download it?
damn great idea right to me wats ur group
schimmi6 years ago
that was very maguiver-like
PKM6 years ago
Beautifully simple, and I love your prototyping technique with just cardboard, elastic bands and paperclips- I'll have to remember that one. If you are connecting free wires together you can solder without an iron- just twist the wires together, heat in a flame and add solder. Another possible source of louder buzzers is an old smoke alarm- watch out for radioactive sources when dismantling them but it would give the alarm a real bite! +
radio active? what the hell could be radio active in a fire alarm?
As Mr Slippy Fist says, in some smoke alarms there is a tiny radioactive source, which is used to detect smoke by sensing when the radiation crossing a small air gap decreases, caused by the presence of smoke particles.
Have you never changed a battery in one? Theirs a little black thingy with the radioactive sign on it.
oh, really? I've never noticed that before.
johnnyrockstah (author)  PKM6 years ago
Thanks for your comments! Also thanks for the tip on how to solder with heat from a flame and solder :)
theRIAA6 years ago
i really hate bringing this up, but if you don't mind waiting a couple weeks, you can use this as your buzzer:
http://www.dealextreme.com/details.dx/sku.826
i bought one of those from the dollar store and it can change from alarm to chime. It is unbelievably loud though, it says 90 Db on the package but it only gives out 90 Db the first time its used. It sucks up life from those tiny batteries very quickly.
Yeah but with that one you can't make a trip wire... anyway, this one is great for what I was looking for, I needed an alarm "trap" for my LARPing and this works brilliantly, simple enough to arm and disarm without any real skill!
johnnyrockstah (author)  theRIAA6 years ago
Yeah...I own a couple of those alarms. I found out about that alarm AFTER I made this video. I could have saved a buck or two. You can always modify this burglar alarm with a louder buzzer (alarm). Anyway, thanks for watching my vid :)
Patented6 years ago
nice i like it its very simple to make and it work great!
Hawaii000006 years ago
How about you make it a ten dollar alarm. Attach the string to a five dollar note and do the rest as usual. When someone takes the money the alarm goes of.
johnnyrockstah (author)  Hawaii000006 years ago
LOL!
I mean off.
Aar000n3y6 years ago
Can you please include actual instructions on how to make the alarm instead of just a video version?
johnnyrockstah (author)  Aar000n3y6 years ago
When I uploaded this video to the VIDEO section it did NOT give me an option to post detailed instructions along with my video.

I read the Instructables Blog for Nov 30th, and here's what it said:

..."We hope that Videos will support and help grow the site by making a specific section for how-to videos that don't quite need our step-by-step format."

http://www.instructables.com/blog/

Anyway, thanks for watching my vid :)

Johnny Rock Stah
Yes, you are correct. Not everyone has figured out the differences yet.
benjgvps6 years ago
They sell those little door alarms at most dollar stores ( They have them at dollarama which is a Canadian dollar store).
I like it, good job not soldering, I like that about this.
cool! (favorited)