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Sound problem, converting +4 DB to -10 DB ?

Discussion in 'Electronic Repair' started by bart bervoets, Sep 25, 2003.

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  1. I need to make a cable to convert an audio signal of +4DB to -10DB
    (broadcast audio to consumer level)
    How can i do this best, can i just solder in a resistor, if so, what value?

    Bart Bervoets
     
  2. Bob Horvath

    Bob Horvath Guest

  3. Kyle Miller

    Kyle Miller Guest

    A resistor would introduce an impedance mismatch in your cable line,
    which could distort the audio signal. If you know the impedance levels
    of each audio device, you may be able to build a resistive divider
    circuit that would retain the correct impedance levels of each device.
    The signals of +4db to -10db would I believe be approximately 30 times
    as much signal voltage in the broadcast audio device. Perhaps a 30:1
    metal oxide resistor network would work.
     
  4. Jerry G.

    Jerry G. Guest

    What you want is a 14 db pad. If your broadcast unit is using balanced
    audio, and your device is using unbalanced audio, this will be a bit
    complicated to easily do, if you want the quality maintained.

    If you refer to any of the audio reference books, or even do a search on the
    net, there are sites that will show graphs, and give the formulas for the
    signal reduction, and maintain proper impedance. The conversion from
    balanced to unbalanced, or the other way, is what can get complex to do
    properly.

    If you go to the page below it is all very well explained
    http://www.tape.com/Bartlett_Articles/db_or_not_db.html

    Near the bottom, they give an example for what you want. But it is done in
    a shortcut way. The proper way is to use some active circuitry, and it would
    be a bit complex to design yourself.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    Instruments http://www.zoom-one.com/glgtech.htm
    =========================================


    I need to make a cable to convert an audio signal of +4DB to -10DB
    (broadcast audio to consumer level)
    How can i do this best, can i just solder in a resistor, if so, what value?

    Bart Bervoets
     
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