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Inductors for front panel HDA audio board EMI filter

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    #1

    Inductors for front panel HDA audio board EMI filter

    My PC case doesn't have front audio jacks in any shape or form and recently this has started to become quite annoying.

    I decided I would try to build my own board to hook up... (Attached is the schematic from Intel)

    What I don't understand is the part about the inductors for the EMI filter:

    "ZL should be 600Ω or greater @ 100MHz with a low Q (broad Impedance
    curve over frequency)"

    How am I supposed to work out what exactly I would have to buy?
    Attached Files
    "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
    -David VanHorn
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    #2
    Re: Inductors for front panel HDA audio board EMI filter

    In practice you can get by without them. However, some devices might not like it. Most cases actually come without such filters, this is why the front panel jacks (especially the mike input) tend to be noisy.
    Originally posted by PeteS in CA
    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
    A working TV? How boring!

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      #3
      Re: Inductors for front panel HDA audio board EMI filter

      I think I would prefer to have it with the filter if possible to prevent any issues

      Maybe I need to read up on Inductors...
      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
      -David VanHorn

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