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voltage divider with diode

Discussion in 'General Electronics Discussion' started by bhuvanesh, Feb 26, 2014.

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  1. bhuvanesh

    bhuvanesh

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    Aug 29, 2013
    i have seen voltage divider circuit with loudspeaker and diode.why they are using diode instead of resistor.explain me basically.Thank you in advance
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Show us. It's hard to tell what may be happening from your description.
     
  3. bhuvanesh

    bhuvanesh

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    Aug 29, 2013
    i have no schematics.what i want to know is if we want transfer maximum power to lead(loudspeaker)we have to match source resistance with load resistance.but speaker resistance changes with frequency.so i am recommended to use diode instead of resistor.but i dont know why.Thas my question
     
  4. BobK

    BobK

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    Jan 5, 2010
    A reasonable amplifier will have a source resistance of way less then 1 Ohm. You really do not want maximum transfer of power, or your speaker would be < 1 Ohm impedance. In fact, the ratio of the speaker impedance to the source impedance is called "damping factor" and higher is considered better, becuase a high damping factor suppresses the speaker resonance and contols the movement of the speaker better.

    See here:

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


    Bob
     
  5. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Bobs right. And a high damping factor is more important from a sound perspective at low frequencies which prevents boomy bass. The damping factor can also go down quite a bit with increasing frequency due to the reactive nature of the speaker.

    Adam
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Most audio amplifiers aim for zero output impedance and zero resistance in the leads.

    This is NOT a case of wanting to match impedances.
     
  7. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Nov 28, 2011
    And to answer your question specifically, no, you never connect a diode in a speaker circuit. That will cause distortion (more or less, depending how you connect it). A diode will not compensate for the speaker resistance changing with frequency.
    You may have misunderstood what you heard. If you can tell us exactly what you were told, we might be able to work out what was meant, and tell you whether it's right or not.
     
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