gain amplifier circuit

Discussion in 'Analog & Mixed-Signal Design' started by omar675, Apr 5, 2018.

  1. omar675

    Thread Starter New Member

    Apr 5, 2018
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    hello
    i need a diagram for a circuit that amplifies sound and speech
    it is supposed to give out a constant output whatever the input is
    (ex. if i speak in a low voice the circuit is supposed to increase the gain and give it as the output and if i speak in loud voice it is supposed to reduce the gain and give it as the output)
    i looked it up and it is called a gain amplifier or a pre-amp circuit but i couldn't find what i was looking for
    any help would be appreciated
    thanks in advance
     
  2. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
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    Google "automatic volume control" or "automatic volume control circuit".
     
  3. shteii01

    AAC Fanatic!

    Feb 19, 2010
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  4. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
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    Automatic Volume Control ( avc)...


    automatic-volume-control-schematic.gif
     
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  5. omar675

    Thread Starter New Member

    Apr 5, 2018
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    0
    Ok so i got the circuit and i tried to simulate it using orcad cadence
    I know iam supposed to get the same gain using different voltage input
    I used sin voltage source and frequency from 1 to 1000
    I probably messed up somewhere
    What values should i put exactly if i did it wrong?
     
  6. MisterBill2

    Well-Known Member

    Jan 23, 2018
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    Really, the circuit is called a compressor, or a speech compressor. A gain amplifier is simply an amplifier. The concept of a speech compressor is that as the input increases the gain is reduced just enough to keep the output constant. But be careful because there are also limiter circuits that simply limit the amplitude by clipping it, which causes a lot of distortion. Unfortunately some folks call the limiters compressors, an incorrect label.
     
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