Connect with us

Differential Amp

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

Scroll to continue with content
  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.

    Chuck
     
  2. Michael

    Michael Guest

    Hi,

    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?

    Cheers,

    Michael
     
  3. Michael

    Michael Guest

    Hi,

    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.)

    Cheers,

    Michael
     

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


    --
    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
    10k
    ___
    ,----|___|---,
    | |
    | |
    | 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
    --o--
    0V

    (created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-