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Homework Help: Zobel network in parallel with a speaker

  1. May 15, 2006 #1
    a zobel network consisting of a capacitor C and resistance Rc is connected in parallel to a speaker of inductance L and resistance Rl.show that frequency at resonance =1/2pi*Sq rt 1/LC(Rlsquare-L/C ÷ Rc square-L/C)

    i have begun by equating the reactive components of the branch currents.
    (but i dont seem to get anywhere to the expression what i want)
  2. jcsd
  3. May 15, 2006 #2


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    Staff: Mentor

    Is a zobel network a series RC or a parallel RC? Probably a series RC in parallel with the speaker's series RL?
  4. May 25, 2006 #3
    it is a RC series connected in parallel with RL.

    Attached Files:

  5. May 25, 2006 #4
    i have drawn the phasor diagram ( which i will upload later).
    from the phasor diagram i can say that
    iLsin thetha=iCsin thetha
  6. May 25, 2006 #5


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    Homework Helper

    Hint : Find the complex impedance of the combination. At resonance, the impedance will behave as a pure resistance (the reactive component vanishes).
  7. Jun 4, 2006 #6
    i have derived the desired result. the second part of the problem(see atached)i do not know where to start.

    Attached Files:

  8. Jun 4, 2006 #7
    attached diagram

    Attached Files:

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