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will this alarm go off if I move it??

Discussion in 'Electronic Components' started by Imp, May 19, 2006.

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  1. Sjouke Burry

    Sjouke Burry Guest

  2. Vibration detectors use a relatively heavily weighted mass that moves
    easily and is held in contact by a relatively light (eg. spring)
    force. You'd have to whack a reed very hard to get it to open, and
    maybe hard enough to destroy it to get it to close.

    Best regards,
    Spehro Pefhany
  3. ehsjr

    ehsjr Guest

    Yes it will, if you move it far enough. It is a reed switch
    and a separate magnet. You put the magnet near the alarm
    circuit. When you separate them, the alarm goes off. If
    you move both the magnet and the switch together without
    changing the distance between them, it won't go off.

  4. Yeah, what James said. History shows that "I want something to scare
    the cat when she jumps on the counter" gets a lot more responses (and
    maybe even solutions you hadn't thought of) than "I want an alarm to
    go off when something moves", especially when you can't or won't
    define "something" or "moves".
  5. I was concerned about the vagueness, once that perceptive question was made
    by Jame Thompson earlier, when the OP tried his first attempt to launch
    this in a new thread.

    He asked "Does it need the ability to go bang?".

    That got me thinking, and the only things we know are that the thing is
    size-limited to a 'box' about 3" thick, 10" long, i.e. a size that could be
    easily stowed in a laptop computer bag. We also know that mercury switches
    were vehemently rejected, and I considered the possibility that if those
    were in such a bag, and if such a bag were passed through the x-ray machine
    at a customs checkpoint, the dense liquid metal might be highly detectable,
    and suggestive of a triggering device.

    I didn't speculate any further before I decided that in the absence of a
    straight answer from the OP, I wasn't going to assist. I recommend similar
    caution to others. :) Fortunately, I am seeing such caution.
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