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Ring generator for telecom

Discussion in 'Electronic Components' started by Andre Zanon, Nov 23, 2006.

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  1. Andre Zanon

    Andre Zanon Guest

    Does anyone knows a component, simple and not expensive for generating
    the ringing voltage for a telephone? Something that would, with a few
    external components raise the voltage from around 5V or 12V to the
    ringing voltage of a telephone?
     

  2. Ring gemerators are availible, but they are not cheap. In the US you
    need a 20 Hz sinewave @ 90 VAC. Is this a permanent application, or
    temprary? A small PA amp with a 70 Volt line output and any 20 Hz
    oscillator woll work.

    If you can find a surplus Western electric or other brand of 1A2
    style key telephone power supply made for your country, it will have the
    right output.

    <http://search.ebay.com/search/search.dll?from=R40&satitle=Ring+Generator+>
    has some used and surplus items, as well.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  3. Ryan Weihl

    Ryan Weihl Guest

    google for "ring generator"

    --
     
  4. Andre Zanon

    Andre Zanon Guest

    Andre Zanon escreveu:
    Thanks, I will check,

    This is a product we do in small quantities. Now I am using a
    transformer that has 2 outputs: 10V CA and 40V CA, the second one I´ve
    made a simple charge pump to generate the ring, and also the line
    voltage 40V CC.
    It is cheap this way, works well. But I am thinking about making
    something better, but not very expenive.

    Thanks again for the info,

    André
     
  5. Salmon Egg

    Salmon Egg Guest

    This sounds like a job for a transformer. 5:1 step up transformer should be
    adequate for stepping up 12VACrms to 60VACrms. I do not know for sure, but I
    expect that would be adequate for ringing. You could use a 60Hz to do that,
    but you must remember that the primary and secondary voltage ratings are
    inversely proportional to operating frequency. That is, for a ringing
    frequency of 20Hz, the primary should be rated for 36V while the secondary
    should be rated at 180V.

    Bill
    -- Fermez le Bush
     

  6. Real telephone bells require the right frequency to ring. The coil
    and capacitor are a series resonant circuit, and in the days of party
    lines, multiple users had different ring frequencies.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
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