Getting constant volume (sound) level at o/p even i/p level is increased/decreased

Discussion in 'The Projects Forum' started by sanjay76, Sep 15, 2011.

  1. sanjay76

    Thread Starter New Member

    Jul 6, 2011
    4
    0
    Please help in a project which can give constant level of volume at its output whether the input volume level is increased/decreased (within certain limits) and microphone should act as input device.
    The out put volume level should be automatical maintained at fixed pre-determined level without any manual adjustment required.

    P.S.- Please start from very basic and speacial consideration towards power consumption
     
  2. iONic

    AAC Fanatic!

    Nov 16, 2007
    1,450
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    Microcontroller.
     
  3. Adjuster

    Late Member

    Dec 26, 2010
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    Last edited: Sep 15, 2011
  4. #12

    Expert

    Nov 30, 2010
    18,093
    9,682
    The words, "automatic level control" or "automatic gain control" are good ways to start. I played with some of those chips 30 years ago when I worked with a band. (They aren't very good for musicians.) Let's see...NE570 or SA571 compandor. There's a cute word. compressor-expander = compandor
    I don't think Signetics makes those any more.
    H*** I'm so old I don't even know if Signetics exists any more!
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,202
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    Signetics was acquired by Phillips Semiconductors (now NXP) in 1975; the brand continued for several years, later becoming fully integrated. In 1995, NXP spun off the Korean assembly and test operation, who continues to use the name "Signetics"
    Source: http://en.wikipedia.org/wiki/Signetics
     
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