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audio board ... input and output impedances...

Discussion in 'Misc Electronics' started by larya, Feb 5, 2006.

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  1. larya

    larya Guest

    Greetings....

    Would someone please tell me what the specs are for the audio output
    and input levels and impedances for computers....

    Thanks...

    Larry ve3fxq
     

  2. There are some variations from sound card manufacturer
    to another, just like in hifi equipment.

    You can find some details at
    http://www.epanorama.net/links/pc_sound.html#interfacing

    Line level outputs on consumer PC soundcards can typically output
    signals up to 2V levels and ouput impedance typically from tens of
    ohms to few hundred ohms (quite typical is 30-400 ohms). Those line
    level outputs are designed to be connected to consumer equipments
    (normal Hifi amplifier with -10dB nominal level line input) or powered
    multimedia speakers.

    Typical line level audio input connections are generally designed to
    accept audio signals in the range of 500 mV to 2V. They are designed
    to operate nicely with consumer equipments like tape decs and CD
    players nicely (those devices use typically -10dB signal level).
    Line level audio input connectors are high impedance inputs
    (typically around 10-47 kohm).

    Most sound mic card inputs require a minimum signal level of at least 10
    millivolts. Sound Blasters and some older 8-bit cards need 100
    millivolts. Practically all consumer soundcard supply bias voltage on
    their outputs to power the electret microphones (the only microphone
    type which works with this kind of cards). The input impedance of the
    typical PC soundcard microphone input is typically in order of 1500 to
    20000 ohms (can vary from card to card).
     
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