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Homework Help: RL High-Pass/Low-Pass Filters

  1. Jun 25, 2009 #1
    Does anyone know the formula to find the cutoff frequency for an RL High-Pass/ Low-Pass Filter?

    I know with RC filters it's 1/ (2ΩRC) ,but this does not work for RL filters.
  2. jcsd
  3. Jun 25, 2009 #2
    I figured it out, but if anyone is ever looking for it it's:

    Fc (Cutoff frequency) = R/ ( 2π L)
    Last edited: Jun 25, 2009
  4. Jun 25, 2009 #3


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    Staff: Mentor

    Your PI symbol is coming out as an Omega...
  5. Jun 25, 2009 #4


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    Staff Emeritus
    Science Advisor
    Homework Helper

    FYI, if you copy-and-paste the text on the right below, you'll get a nice looking pi symbol:

    π .. [noparse]π[/noparse]
  6. Jun 25, 2009 #5
    That's wierd, but it's all fixed. Thanks for pointing it out.
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