ISIS op amp

Discussion in 'General Electronics Chat' started by semra, May 19, 2011.

  1. semra

    Thread Starter New Member

    May 19, 2011
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    0
    Hi everyone, I tried low pass second order filter in isis, but it doesnt work. error is "no model specified for op amp" . can you help me? I attached the pis
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    283
    Is the simulator confused? You have put in an LM339, which is a quad voltage comparator.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,772
    2,540
    Emphasis on comparator. A comparator is a digital gate that resembles an op amp, but is not an op amp.
     
  4. Jaguarjoe

    Active Member

    Apr 7, 2010
    770
    90
    A comparator is a 1 bit ADC.
     
  5. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    313
    Are you SURE you have or downloaded the correct model for the OPAMP you want to use?

    Are you SURE you put the model in the correct folder?
     
  6. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The circuit will not work with an opamp because the circuit has a single positive supply voltage and the input is biased at 0V instead of at half the supply voltage.
     
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