zobel circuits, timing and resonance?....or is it?

Discussion in 'General Electronics Chat' started by ninjaman, Nov 18, 2013.

  1. ninjaman

    Thread Starter Member

    May 18, 2013
    306
    1
    hello
    i stuck on something. i have a zobel circuit of one speaker of 8 ohms and a resistor and capacitor in parallel with the speaker. the capacitor and resistor are in series across the speaker.

    am i right in thinking that the resistor is a timing element?
    is the capacitor making a resonant circuit with the inductor.

    when Xc = Xl power transfer is maximum?

    is this the purpose of the capacitor?

    i know it is supposed to stabilize the speaker. because without the capacitor, the impedance of the speaker will change with frequency. the amplifier output impedance will stay the same and will see the change of speaker impedance. this will cause power transfer problems.

    any help would be greatly appreciated!!!

    thanks, all the best

    simon
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,715
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    Have you looked at the Wikipedia article:

    http://en.wikipedia.org/wiki/Zobel_network

    The resistor and capactitor, combined with the impedance of the speaker, form a filter with specific properties. All of the components interact to achieve this, so it is difficult to claim that one particular element is a timing element.
     
  3. Wendy

    Moderator

    Mar 24, 2008
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    2,534
    Schematics are the language of electronics. Always, please show a schematic.
     
  4. bertus

    Administrator

    Apr 5, 2008
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  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,969
    744
    A Zobel circuit is used to flatten the bass and mid range frequencies of the speaker coil of that circuit do to inductive reactance.
     
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