op amp 741

Discussion in 'Homework Help' started by vustudent, Aug 23, 2010.

  1. vustudent

    Thread Starter Active Member

    Mar 11, 2009
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  2. tom66

    Senior Member

    May 9, 2009
    2,613
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    The resistor is used in some configurations to null the input bias current. The bias current flows through the resistor compensating for the bias current of the inverting input (which is usually equal.)
     
  3. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The inverting input has R2 supplying the bias current. The non-inverting input needs to have the same value resistor (R4) supplying the same bias current for its input.

    If you used a Fet-input opamp (like the TL071) then R4 can be a piece of wire.
     
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