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Discussion in 'Electronics Homework Help' started by vick5821, Nov 2, 2012.

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  1. Nov 2, 2012 #1
    vick5821

    vick5821

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    Jan 22, 2012
    Dear all,
    [​IMG]

    I want to ask, what is the purpose of those resistor in the inverting and non-inverting op-amp ? What actually op-amp does ? Op-amp = comparator? Any differences ?

    Thank you
     
  2. Nov 2, 2012 #2
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    The equation for an op-amp is Vo = A(V+ - V-)

    You should have fun in class with this equation seeing what happens when A gets very large.

    You really should look at those equations and find your own way to determining what those 2 resistors do.
     
    Last edited: Nov 2, 2012
  3. Nov 2, 2012 #3
    Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    An OpAmp is an amplifier which amplifies the voltage difference between the "+" input and the "-" input. The open-loop gain of the OpAmp is very high. so feedback is needed to bring the gain into a usable range.

    This is a basic explanation of the operation of OpAmps.

    I recommend this free PDF for in-depth studies.
     
  4. Nov 2, 2012 #4
    vick5821

    vick5821

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    Jan 22, 2012
    The resistor act as the potential divider ?
     
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