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phone cct

Discussion in 'Electronic Basics' started by grod, Dec 10, 2003.

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  1. grod

    grod Guest

    Can anyone explain how I can make a telephone ring without being connected
    to the telephone line. This is for a play.

    Thanks
     
  2. John Fields

    John Fields Guest

     
  3. Bob

    Bob Guest

    The phone company applies about 90Vac @ 20Hz to ring the phone during
    ringing, but they also have special circuitry to remove the ringing voltage
    quickly when someone picks up the phone ("goes offhook").

    It's possible that a phone might ring if standard 120Vac @ 60Hz (i.e.,
    household power) is applied to the phone (the green and red wires), but this
    would be VERY dangerous. If there were no circuit to either limit the
    current, or disconnect the high voltage if the phone were to go offhook,
    then the person using the phone could be harmed.

    The easiest way would be for you to get a real phone line, for the play, and
    then just call it (and hope that no one else calls it at the wrong time).
    There are also telephone line simulators that you may be able to rent. How
    about a tape recording of a phone ringing? A cellphone? Teach someone to
    make a sound like a phone ringing?

    Be careful! You want to make sure all the actors are still alive in case
    there's a curtain call.

    Bob
     
  4. http://www.users.dialstart.net/~gbg/

    it's a bit spendy but it'll do the job nicely.

    You may be able to find circuits or cheaper boxes that do the same thing on
    the net.

    --Russell
     
  5. http://www.techlib.com/electronics/telephone.html

    Even better, you can build it yourself. :)

    --Russell
     
  6. Ian Stirling

    Ian Stirling Guest

    Obtain a mobile with polyphonic ring.
    Download appropriate ringtone.
    Ring phone.
     
  7. Si Ballenger

    Si Ballenger Guest

    You might be able to put one of the cheap FRS radios behind or
    close to the phone on stage, and then while holding down the
    transmitt button on another, play a tape of a phone ringing into
    it and the ring would come out of the one on the stage. Would
    make an interesting speaker phone so the audiance could hear both
    sides of the conversation. Wire up the cast with their own radios
    with ear buds so they can be prompted when the lines are
    forgotten.
     
  8. Rich Grise

    Rich Grise Guest

    If you're going to use an audio tape of a phone ringing,
    just patch it into the PA, like they do in real studios. ;-)
    Be sure the sound guy can see the stage, and cue the "click"
    (and kill the bell) when the actor picks up.

    Break a Leg!
    Rich
     
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