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600-ohm to 600-ohm line transformer

Discussion in 'Electronic Basics' started by riviera321, Jan 31, 2005.

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  1. riviera321

    riviera321 Guest

    I need a 600-ohm to 600-ohm line transformer for an audio device, thay
    also caled them Audio transformer...

    What are those type of transformer ?

    how many spire (turn), what's are the voltage, where could I find them
    ?

    Any information about it will be appreciate.

    Thank,

     
  2. Tom Biasi

    Tom Biasi Guest

    Try www.Rhombus-ind.com
     
  3. You asked this already, don't expect email when posting to a newsgorup.

    They are audio transformers, for applications where isolation is needed
    but not voltage step up or step down is needed.

    You used to get them nice and bulky, for good audio response. I don't
    know where you can get them nowadays.

    As someone pointed out, they are commonly found in modems these days, so
    dig up a modem that nobody wants due to being too slow, and grab the
    transformer off that. It will be the only transformer on the modem board
    (assuming it's an internal modem).

    Radio Shack had some tiny ones for a while, but I don't suppose they
    still carry them.

    Michael
     
  4. Dbowey

    Dbowey Guest

    et472 posted:

    You asked this already, don't expect email when posting to a newsgorup.

    They are audio transformers, for applications where isolation is needed
    but not voltage step up or step down is needed.

    You used to get them nice and bulky, for good audio response. I don't
    know where you can get them nowadays.

    As someone pointed out, they are commonly found in modems these days, so
    dig up a modem that nobody wants due to being too slow, and grab the
    transformer off that. It will be the only transformer on the modem board
    (assuming it's an internal modem).

    Radio Shack had some tiny ones for a while, but I don't suppose they
    still carry them.

    There are many types of 600:600 Ohm transformers. Do you need it tapped? Both
    sides or only one side? Do you need a spit primary or secondary so you can do
    something to current flow? How much current must it handle?

    There are many suppliers. I did a google for "600 Ohm line transformer" and
    got a bunch of hits. Here's one:

    <A HREF="http://www.sarah-grp.com/english/submenu-e.htm">SARAH, INC.</A>

    Don
     
  5. Andrew Holme

    Andrew Holme Guest

    They are also found in cordless telephones.
     
  6. juliuspk

    juliuspk Guest

    -------------------------------------
    riviera321 wrote:


    I need 600 ohms to 600 ohms 1:1 transformer Turns so I could design it by
    my self.

    If any one know the Turns on Primary and Secondary please let me know..

    Regards,

    Julius

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  7. Andrew Holme

    Andrew Holme Guest

    The number of turns required depends on the frequency of operation and
    the permeability of the core. You need enough turns to make the
    reactance of the coil significantly greater than your operating
    impedance. You don't want too many turns, as that would increase
    losses. 1000 turns might be right for one frequency, but you would
    only need 10 at some other higher frequency. You need a lot of turns
    for audio.
     
  8. Rich Grise

    Rich Grise Guest

    Why not just cannibalize one out of a modem?

    Good Luck!
    Rich
     
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