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High power variable resistor?

Discussion in 'General Electronics Discussion' started by eem2am, Jul 8, 2013.

  1. eem2am

    eem2am

    414
    0
    Aug 3, 2009
    Hello,

    I need to make or get a 40W variable resistance , which is to be as non inductive as possible.

    It will carry a current which is a constant 1.9Arms , 50kHz , sinusoidal current.

    So the resistance has to be variable from zero Ohms to about 11 Ohms.

    Ive found this but its too high resistance and looks rather too inductive
    http://mf-powerresistor.com/rr_pw.htm?gclid=COyMx4vGoLgCFdMQtAodQgsAnw

    Do you know who makes these things?
     
  2. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    If this has anything to do with your other two posts (with the same title) where you're looking for a digital pot, I can't imagine how a headset is going to suck up 40 Watts! It would turn your brain into a pile of goop! :eek:

    Chris

    Oops, that wasn't you! Sorry about that.

    A high power wire wound pot isn't going to present much reactance to 50KHz. How much can you tolerate?
     
    Last edited: Jul 8, 2013
  3. eem2am

    eem2am

    414
    0
    Aug 3, 2009
    i can tolerate maybe a few microhenries
     
  4. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    A 1" length of wire can have that much inductance.

    Chris
     
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