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1:1 Center-taped transformer

Discussion in 'Datasheets, Manuals or Parts' started by richacm, Jun 26, 2008.

  1. richacm

    richacm New Member

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    Hi,

    I have been using the datasheet for the ENC28J60 (http://shop.tuxgraphics.org/snippets/enc28j60-version2006.pdf?id=1fb4a0) to connect to my network. In it it says to use a 1:1 center-taped pulse transformer rated for Ethernet operation. I have been trying to find a part that meets these requirements but haven't been able to.

    Does anyone know a part number that would work?

    Thanks,

    Craig
     
  2. dknguyen

    dknguyen Well-Known Member

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    Last edited: Jun 26, 2008
  3. Mikebits

    Mikebits Well-Known Member

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    Here are a few more PHY transformers:
    Belfuse: S558-5999-U7
    Halo: TG110-SO55N2
    Tyco/Transpower Technologies: Part # HB626-1, HB726, 1605000-1
    Pulse Engineering: Part # H1102, H1117, H1012, J1035, J0011D21B
    Midcom: 000-7160-30R
    Sorry I did not have links, you should be able to google the pn#
     
    Last edited: Jun 26, 2008
  4. dave

    Dave New Member

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  5. richacm

    richacm New Member

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    Thanks, I especially like the J0011D21B - have tried to get a sample from pulse engineering. They don't seem to have a shopping cart facility and I couldn't find any other suppliers selling it. Does anyone know where I can buy one of these?

    Thanks,

    Craig
     
  6. Mikebits

    Mikebits Well-Known Member

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  7. richacm

    richacm New Member

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    Oh yes so they do. I have to order 125 of them though!

    Does anyone want to buy the other 124 off of me? :)
     
  8. Mikebits

    Mikebits Well-Known Member

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    That 125 unit quote is what is required for price break, I am sure you can still make a small order at higher cost. Call them or try their online chat thingy.
     
    Last edited: Jun 26, 2008
  9. mvs sarma

    mvs sarma Well-Known Member

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    These appear to be like communication transformers used for ISDN modems. In case you come across any salvaged ISDN Modem, probably you could retrieve them.
     
  10. Mikebits

    Mikebits Well-Known Member

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    For that matter, just salvage from an old ethernet card. That x-former is standard on all of em.
     
  11. mvs sarma

    mvs sarma Well-Known Member

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    You are right Mike, and the component can be physically positioned and hand-wired if pin compatibility is an issue.
     
  12. audioguru

    audioguru Well-Known Member Most Helpful Member

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    If you spell it correctly then you might get what you want at a low price.
    A center taped transformer is completely different from a center-tapped transformer.
     
  13. mvs sarma

    mvs sarma Well-Known Member

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    I request for little more clarity on the said spelling. I do understand that a transformer of this type cant be described in words and only thing is proper schematic with data and / or code number, if known.
     
  14. audioguru

    audioguru Well-Known Member Most Helpful Member

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    You must use the correct spelling or give up doing technical things. Do gardining instead.

    A center-tapped transformer is with a tap in the center of its winding. A center-taped transformer has a piece of tape in its winding that does nothing.
     
  15. Mikebits

    Mikebits Well-Known Member

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    There is only one i in gardening :rolleyes:
     
  16. mvs sarma

    mvs sarma Well-Known Member

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    Oh Mike, accidental spelling mistakes do happen. We need not bother that seriously Sir. let us take his intention that youth should have good command over the language, as they have a lot to do in future.
     
  17. audioguru

    audioguru Well-Known Member Most Helpful Member

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    I make spelling mistakes sometimes.
    My garden has so many weeds that I call it a "gardin".
     
  18. mvs sarma

    mvs sarma Well-Known Member

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    in fact , in a hurry reading of your post I missed the additional 'p' in the word taped and tapped. this made me seek a clarity-sorry for that AudioGURU
     
  19. Mikebits

    Mikebits Well-Known Member

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    I am typically not persnickety about spelling errors. I just found it irresistible not to point out a spelling error in this case, as it was ironic that in the same sentence where AG is scolding someone for spelling errors, he makes one himself. Get the point?
     
  20. mvs sarma

    mvs sarma Well-Known Member

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    yes. I understood your point. perhaps i better send a pm to you.
     
  21. richacm

    richacm New Member

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    Funny thing is I copied this directly from the Datasheet to make sure I got it correct. :confused: Check out section 2.4 of previously attached datasheet. No wonder I was having trouble finding one!!!
     

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