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4H chokes?

Discussion in 'Electronic Design' started by Mathias, Apr 23, 2007.

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  1. Mathias

    Mathias Guest

    Dear ng,

    I found an old design here
    http://www.iop.org/EJ/abstract/0022-3735/3/2/420

    for an arc lamp power supply that includes a pair of 4H chokes rated at
    0.5A, 25R. As far as I can tell these would have to be gigantic, right?
    I understand that chokes available today (at least below $20) are in the
    range of ~10mH. Do I miss something?

    Thanks,
    Mathias
     
  2. Eeyore

    Eeyore Guest

    Given the resistance I don't suppose they carry that much current. Size willre
    alte to current rating.

    Check out the chokes used for smoothing the HT supplies in valve amps.

    Graham
     
  3. You wouldn't want to carry one all day.
    They would be made with laminated iron cores, not ferrite or
    powdered iron.

    Here are some smaller examples. The weight goes up roughly
    in proportion to the stored energy, that is proportional to
    inductance, and proportional to the current squared. Pick
    one and scale it up.
    http://www.alliedelec.com/Search/Se...59U&sid=462019804C28E17F&N=-1248&SKU=967-0197
     
  4. Tam/WB2TT

    Tam/WB2TT Guest

    They will weigh in the neighborhood of 2 - 5 pounds each. Good place to
    start looking would be www.surplussales.com ; also, Fair Radio, and RF
    Parts. $20 is probably about the right price for a used/surplus unit.

    Tam
     
  5. Robert Baer

    Robert Baer Guest

    ....and why the h*ll should i !pay! $30 for some piddling document?
     
  6. Mathias

    Mathias Guest

    ...and why the h*ll should i !pay! $30 for some piddling document?
    well, that's a good question. If you're in a uni/library chances are you
    have free acess. Otherwise these fees are way too high, definitely.
    That's why I try to publish open acceess myself...
     
  7. joseph2k

    joseph2k Guest

    Totally agreed. The problem is that many traditional publishers have come
    upon this idea for an income stream, neglecting the idea that most people
    are willing to pay only for value received (which is usually less than a
    tenth of the price asked for the various articles "offered"). Not to
    mention the side issue that they are allergic to transactions of less than
    US $20.
     
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