impedance matching

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  • georgethomson
    Junior Member
    • Feb 2006
    • 2

    impedance matching

    hi there

    i hope someone can help i seem to be going round in circles.

    i am trying to place a speaker box inplace of where there used to be a headset. i am planning to use an 8 ohm speaker and the headset was 180 ohms. does anyone know how to work it out or can some one do it for me???

    many thanks in advance
  • whoaru99
    Senior Member
    • Jul 2004
    • 638

    #2
    Details of what you are connecting the headphone/speaker to may be helpful to give a good answer.
    There are some things which are impossible to know, but it is impossible to know which things these are. :scratchhead:

    ----JAFFE'S PRECEPT

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    • georgethomson
      Junior Member
      • Feb 2006
      • 2

      #3
      hi

      thanks for replying

      the info i have is the headphone impedance is 230 ohms (sorry i thought it was lower) the output level at 0.5v/1khzis 81dba. there is an amplifier that feeds the headphones, which i'm still planning to use and the data i have for that is freq range 63-1600hz -6db, amplification 200mV/200ohms at an input signal of 4mV/1Khz, supply voltage 15-27V and power consumption is 18mA at 27V.

      i am planning to use a normal 4 inch 8 ohm speaker.

      all the above data was taken of a data sheet so if there is any other infromation i can provide please let me know.

      many thanks

      Comment

      • Karma
        Senior Member
        • Nov 2005
        • 801

        #4
        HI,
        Sorry to say, it won't work. Headphone jacks have series resistors in place to limit the current draw to prevent just what you are trying to do. If you connect a speaker it will play but at very low volume. Not a good idea. You could connect another amp to the jack. But what's the point?

        Sparky

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