$5 Dollar Burglar Alarm!

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Introduction: $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)

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    user

    We have a be nice policy.
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    25 Comments

    I can't get the video to play.

    Seems so simple! It will be very useful tip  to <a href="http://www.800amalarm.com">alarm system install companies </a>.
     

    LOL I have done that before with a plastic cd case!

    user

    yarrrrrr how to download it?

    damn great idea right to me wats ur group

    that was very maguiver-like

    user

    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?

    user

    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.