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Differential Amp

Discussion in 'Electronic Basics' started by chuck, Feb 28, 2007.

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  1. chuck

    chuck Guest

    The batteries are in series and connected to a load? You can't
    disconnect the load and simply measure the voltage of each battery with
    a simple DMM?

    I'm a bit confused by what you are trying to do, Michael.

  2. Michael

    Michael Guest


    I have a bank of 6 6V batteries and I'd like to be able to measure the
    voltage across each one. Would the best way be to use a diff amp as the
    voltage won't be relative to ground?

    If so, could someone please suggest a suitable IC that will won't go into
    saturation round the 45V area?


  3. Michael

    Michael Guest


    I'm building a robot that has 6 6V batteries as its power source and I'd
    like to monitor each battery when the robot is operating. As it's designed
    to work from some distance, I need to read the voltage and input it into the
    onboard computer computer so it can be transmitted (IE I can't just use a
    DMM as I won't be there to read it.)



  4. Resistive dividers, and a mux to an A/D converter. BTDT, and its in

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  5. john jardine

    john jardine Guest

    For one diff' measurement it's simple to just use a standard opamp and
    resistors to knock the voltage down and increase the common voltage range.
    This example would put out 1/10 of the diff' voltage in. Ie 0.60V for a 6.0V
    battery. That 6 volts could be sat on top of anything from 0V upto about 45V
    | |
    | |
    | 5V |
    | -o- |
    100k | | |
    ___ | |\| |
    ( - ) in o------|___|----o----|-\ | Out
    ___ | >----o------o
    ( + ) in o------|___|----o----|+/ 0-5V
    | |/| o
    100k .-. | |
    | | -o- --o--
    10k| | 0V 0V
    | Opamp is a 'rail to rail' in&out type

    (created by AACircuit v1.28 beta 10/06/04
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