current sense

Discussion in 'General Electronics Chat' started by bug13, Apr 22, 2013.

  1. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
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    Hi Guys

    I want to design a low side current sense circuit, it can sense 1mA to 5Amps, with a resolution of 1mA in the range of 1mA to 100mA.

    Is it practical to design that with a lm358?

    the output will feed to an ADC of a MCU.
     
  2. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    One word, maybe. Please post the schematic of the proposed measuring circuit.
     
  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    1,606
    Very doubtful this device would work for you, tough I may be surprised when I see your schematic.

    You would have a much better chance if you stick to op amps designed in the current century. The LM358 is pushing 40 years old.
     
  4. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
    By the sound of it, lm358 is no good. So will my following circuit work with a better op amp? or do I need an better circuit for this purpose?

    by the way, I am just a regular guy who is interested in electronics, nothing more :)

    [​IMG]
     
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