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  1. #1
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    op amp voltage divider

    Just wondering, can an op-amp be used as a buffered voltage-divider instead of introducing gain in a circuit.

    •   Alt7th August 2007, 08:54

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    op amp divider

    give the output of the voltage divider to a voltage follower... thus the voltage dividers output gets buffered as well as is independent of the load since the input current of op amp is zero...



    •   Alt7th August 2007, 10:17

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    op amp divider circuit

    An op amp used in an inverting amplifier configuration can have any gain including less than one. Thus is can be used as a buffered voltage divider.



    •   Alt8th August 2007, 16:52

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    opamp divider

    But the gain will be negative. So be careful if your circuit doesn't have reverse protect. I will use the op amp as an adder of two or more other op amps with both inverting and non-inverting gains.



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    voltage divider op amp

    if u require help then contact me

    Added after 21 seconds:

    do contact


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    op-amp as divider

    why would you want to do a divider with an op-amp, when it can be done much more cheaply with resistors?

    -M



  7. #7
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    op-amp voltage divider

    Because any resistive load on that simple resistor divider will mess up your division accuracy, not to mention it might be fairly high impedance node which might be susceptible to noise. You want to use the op-amp as a buffer so you can drive your reference over wider varying loads.



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