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Telephone ringer circuit ?

Discussion in 'Misc Electronics' started by aalex, Jun 17, 2007.

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  1. aalex

    aalex Guest

    What is the best way to make 24 telephones ring ? I have gathered
    quite a bit of information at
    about this. See that page to know more.

    My favorite way to it is with an audio signal, I think. If I do it
    this way, which cheap amplifier can give me 90VAC ?

    Thanks a lot !

    (crossposting to sci.electronic.circuit and sci.electronics.misc)
  2. Hey!
    You 'think' that you invented this problem. Try to investigate what
    has/is done in exchanges of many connections which have to ring many
    phones at the same time. A source of signal exist and is connected to
    the phone that has to ring. In such configuration it is just to program
    the sequence of connections- that's all.

    Have fun

  3. Nico Coesel

    Nico Coesel Guest

    According to the telephone specs, 16V AC (21V peak-peak) should make a
    telephone ring.
  4. Do you have to make all 24 telephones ring at once or switched?

    What is your exact requirement in this case.

  5. Gerard Bok

    Gerard Bok Guest

    Almost any :)
    You just have to add a mains transformer, connected in reverse.
    Connect the transformers output to the amplifier's speaker
    output. Obtain the ring-voltage from the wires that where
    intended to carry 'mains'.
    Use some appropriate voltage ratio, e.g. 10 to 115 Volt or 24 to
    230 Volt.

    Keep in mind, that your ringer signal probably is -- or should
    be-- 25 Hz. As the average transformer is intended for 50 / 60
    Hz, don't load the transformer to more than say 30% of it's rated
  6. aalex

    aalex Guest

    Hi !
    Should I use a bridged amplifier, or simply a mono amplifier ?
    I will try that trick with the 50W amplifier.

    Thanks a lot !

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