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Door bell help

Discussion in 'Electronic Design' started by Bob, Jun 12, 2007.

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  1. Bob

    Bob Guest

    I am working on a project to build the loudest door possible. It nees to
    run off the standard 12v door bell voltage. I have experince assembling
    componenst but not designing them. I was wondering if anyone could help me
    in the design.

    1. I need the bell to stay on for about 3 seconds after the voltage is
    applied. Can this be done without a second source of power?
    2. I am not sure of the sound device yet. I am looking for a small fog horn
    or car horn. If I use this do I have to worry about pulling to much
    current from the small 12v door bell wires?

    Thanks for any suggestions or comments.
     
  2. mpm

    mpm Guest

    Off hand, I would think a small mechanical bell, like those used in
    Burglar Alarm systems.
    Low current, but loud ringing. Or you could try one of those Piezo
    things, but I find they are more annoying. -mpm
     
  3. mc

    mc Guest

    Not very loud. You could charge a capacitor while the button is pressed and
    have the sound continue, powered by the capacitor, for a couple of seconds.
    Most definitely. You don't get more energy out (as sound) than you put in
    (as electricity).

    For a lot of sound from a small amount of energy, some kind of piezoelectric
    sounder is probably the way to go. But don't expect tremendous loudness
    from small amounts of power. And remember that piezosounders are DC
    devices.
     
  4. Rich Grise

    Rich Grise Guest


    http://www.mcmaster.com/nav/enter.asp?pagenum=1798 - take your pick! :)

    Of course, it only rings as long as the button is down. :)

    Hope This Helps!
    Rich
     
  5. ehsjr

    ehsjr Guest

    No - but you need to change the doorbell transformer and
    you need to run new wires to the car horn. See below.
    Change the door bell transformer to a DC supply that
    is capable of providing the current to the car horn
    you are using. Run new wires from the supply to the
    car horn, through a set of relay points. Use the
    existing doorbell wiring to trigger a 3 second timer
    that operates the relay.

    Ed
     
  6. Jasen

    Jasen Guest

    a large gong with a motorised beater.
    depends what you mean, eg: the gong will continue to emit sound for some
    time.
    there is that issue, I've seen smaller versions of the car horn.
     
  7. Matt

    Matt Guest

    Does the bell have to be ready to go again immediately after ringing?
    If not, you could be charging a capacitor (storing energy) when the bell
    is not in use.
     
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