audio amplifier circuit

Discussion in 'Homework Help' started by notoriusjt2, Dec 16, 2010.

  1. notoriusjt2

    Thread Starter Member

    Feb 4, 2010
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    I am supposed to identify each op amp component within the circuit

    [​IMG]



    working from the right side to the left side

    U-3b = non-inverting amplifier
    U-3a =
    U-3c = difference amplifier
    U-3d =

    im having some difficulty with the others

    would it make sense for a high and a low pass filter to be in an amplifier circuit?
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    U3 a d c are not in the direct 'audio' path. R3 should clue you in to the other function being performed
     
  3. bertus

    Administrator

    Apr 5, 2008
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  4. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    A squelch can be used (for example in a FM reciever when searching a station) to block the noise when no input signal (or low noise) is present.

    Bertus
     
  5. tyblu

    Member

    Nov 29, 2010
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    Ack! It's backwards! I'm paralyzed! ;) (Why is it right-to-left? Is this convention used elsewhere?)
     
  6. notoriusjt2

    Thread Starter Member

    Feb 4, 2010
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    U-3b = non-inverting amplifier
    U-3a = inverting amplifier
    U-3c = difference amplifier
    U-3d = comparator
     
  7. bertus

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  8. notoriusjt2

    Thread Starter Member

    Feb 4, 2010
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    so U3-a is just a non-inverting amplifier with divided feedback?
     
  9. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    It's the divided resistor network which set the gain of that stage. ??

    It should be one of the first things you learn about op amps. How to determine the gain.
     
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