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North American Ferrite core supplier for prototypes

Discussion in 'Electronic Design' started by Pooh Bear, Jun 2, 2005.

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  1. Pooh Bear

    Pooh Bear Guest

    Tried Epcos ?

    Uk support for samples seems to be good.

    Damn fine ferrite magnetic design program too ! Invaluable I'd say.

    Graham
     
  2. Any suggestions for a North American supplier with a good online
    presence? Tiny to large E/RM/Pot core etc.

    Most of the distributors and agents seem to have high minimum orders,
    no online stock checking, no online ordering etc. etc. just like in
    the 1970s. There's one within 15 minutes of my office, plenty of
    stock, but they want C$100 per *line item* minimum order (clamps,
    bobbins and cores are 3 line items...).

    The only thing that seems to have changed with the internet is all the
    data and application notes are now online. I don't want to deal with
    surplus houses, the product needs to be known brand name stuff that
    can be had in production quantities.

    Joerg?


    Best regards,
    Spehro Pefhany
     
  3. Too bad ElectroValue is in Rightpondia.


    Best regards,
    Spehro Pefhany
     
  4. Pooh Bear

    Pooh Bear Guest

    Surely you have some friendly distributors over there ?

    After Epcos I'd suggest Ferroxcube and then maybe TDK. Again - you'll have to
    find distributors.

    Are you looking for a specific core size ( general area ) or form style ?

    Graham
     
  5. Chris Carlen

    Chris Carlen Guest


    AllStar Magnetics
     
  6. I think they're more than friendly to transformer winders, not to
    engineers.
    Small. I have some RM6 44 that will probably do but they're a touch
    taller than I'd like. Here's a photo of a cute little gapped EE core
    transformer that does about what I want to do:

    http://www.speff.com/flyback_converter.jpg

    Power is only about 25mW at 50-100kHz (discontinuous mode flyback).
    Must be a lot of leakage inductance with that split bobbin. It's taped
    and all glopped over with conformal coating, so the core is smaller
    than it looks.


    Best regards,
    Spehro Pefhany
     
  7. Tim Wescott

    Tim Wescott Guest

    Amidon, http://www.amidoncorp.com/aai_productselection.htm, sells
    Fair-Rite ferrite and Micrometals iron powder stuff. IIRC it's pretty
    easy to look at the Fair-Rite website and tell which piece is which
    Amidon part.
     
  8. Ah, Fair-Rite has a search engine that shows distributor stock for
    four distributors including Amidon and Deltron in the UK (but no
    prices). Okay, better than a poke in the eye with a sharp stick.

    I don't know what kind of knucklehead programmer designed the "PO"
    form, though. Who would use this option?

    "To send the same Purchase Order to additional suppliers, follow these
    steps"

    Who would send a PO to even one supplier without having a price quote,
    for that matter?


    Best regards,
    Spehro Pefhany
     
  9. I've just been struggling with a related question, myself. I bought
    out a whole rack of various toroids and cylinders (ferrite and
    powdered iron of differing permeability) to play with. I'm interested
    as a hobbyist and want to file away (dremel) bits of them to create
    gaps of different types and to test what I've been able to learn from
    the Unitrode magnetics books and class.

    I'd like a mail-order supplier from which I can order any particular
    basic shape or paired shapes in any particular desired type in small,
    hobbyist quantities at reasonable prices. Permalloy tape-wound for
    low freq, amorphous metal alloys for higher freqs, etc. Composite
    powdered iron, permalloy, Kool Mu, and ferrite in toroids, various
    cylinders, etc. Just toys to play with.

    But I'd like to know what the material is and its expected properties,
    when I buy it. Not because I need to depend on it, as I'd like to see
    about figuring these things out for myself. But because I'd like to
    be able to compare my results with the "known" value to see how I'm
    doing when I do figure something out and would like to know if I got
    anywhere close to right. Some of the places that sell these things
    "on the cheap" provide NO INFO, at all.

    Jon
     
  10. Robert Baer

    Robert Baer Guest

    Try http://www.allstarmagnetics.com/ and they will sample small
    quantities for the cost of shipping.
    If gap grinding is needed, then there is a set-up charge for that.
    There are probably other good places...
     
  11. Robert Baer

    Robert Baer Guest

    Yep...
     
  12. Robert Baer

    Robert Baer Guest

    Ferroxcube P14/8 or P14/8/I are a little larger in one dimension and
    smaller in the other.
    Their P11/7 is certainly compariable in size.
    Their RM6R is about 17.9 mm wide by 12.4 mm high.
    How about their E12/6/3 with the I19/6/5? crappy match, but that
    keeps one dimension down...
     
  13. http://www.farnell.com in UK to see data/stocks but
    they own Newark Electronics and apparently direct
    Farnell part numbers can be ordered via them.
     
  14. Thanks, Tony:-

    Hmm.. Newark themselves show some AVX (Thompson) E-cores at low
    prices, but 2-month lead times, huge minimum orders (like hundreds up
    to >10,000 pieces) and no stock. 8-(

    They're better on Ferroxcube- 17 days lead time and minimum oder 1
    piece (and no stock shown, but probably they're drawing on Farnell, as
    you suggest).

    Digikey could easily take up the latter supplier, they already deal
    with Ferroxcube's masters in Taipei (the old resistor company Yageo).


    Best regards,
    Spehro Pefhany
     
  15. Joerg

    Joerg Guest

    Hello Spehro,
    I'll second Tim's suggestion, Amidon. They have been good to me for
    decades and I even bought from them while in Europe. Haven't bought
    there lately but that is because I had stocked up big time on all the
    cores I might ever need in the lab.

    If you can't find a core in their catalog call them. Often they can
    source it for you. BTW, many of their publications are good, too.

    Regards, Joerg
     
  16. Joerg

    Joerg Guest

    Hello Spehro,

    Another one, especially for power ferrites:

    http://www.kaschke.de/

    Contact Olaf Niemann (details on Int'l Sales page) for tech questions.
    These guys are very knowledgeable and speak English well.

    Regards, Joerg
     
  17. Chris Carlen

    Chris Carlen Guest


    This is my flyback based on Ferroxcube's E13/7/4-3C90 (or maybe 3C94 of
    3F3, I forget). It can do about 6W!


    http://web.newsguy.com/crcarl/images/060205-0029-v1.30s-900x600-7.jpg

    I think it came from AllStar, but there was another Ferroxcube
    ditributor that I dealt with too that sold reasonably small quantities
    of stuff.


    Good day!
     
  18. Joerg

    Joerg Guest

    Hello Chris,
    Ah, Nixie tubes. The good old days. This must have been a while back. I
    was surprised that there is an Atmel chip on the board.

    Regards, Joerg
     
  19. I think it's one of those retro things. The board is clearly
    contemporary, though a deliberate choice has been made to use
    through-hole parts.


    Best regards,
    Spehro Pefhany
     
  20. Boris Mohar

    Boris Mohar Guest

    http://www.neosidcanada.com/company.htm

    One time they cut and ground me few pieces for a custom job. Very
    approachable. None of this " And how many million will you be planning to
    purchase from us in the future"
     
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