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Sound alarm on cut wire

Discussion in 'General Electronics Discussion' started by tomjbirch, Jul 9, 2011.

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  1. tomjbirch

    tomjbirch

    1
    0
    Jul 9, 2011
    hi i am looking for a product the has a power supply of 12v dc and can be linked up to an siren/sounder or even lights,the device has a wire loop which has a very low current in the if the wire is cut or stopped triggers the alarm to sound can you help me in which product i need
     
  2. duke37

    duke37

    5,360
    765
    Jan 9, 2011
    Sounds like a burglar alarm?
    All you need is a 12V relay which drops out when the loop is cut. Connect the siren and lights through the back contacts.
     
  3. donkey

    donkey

    1,286
    56
    Feb 26, 2011
    this circuit i saw a while ago. its simple and a little inaccurate(the relay is nc when voltage is applied to the coil, you need a no)
    http://imageshack.us/photo/my-images/69/burglaralarm.png/
    simple thing to hook up but i have never actually thought about its power drain.
    the fuse if the wire that if cut, activates the buzzer.
    i wish i could give acknowledgement to an author but it was an unsigned schematic
     
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