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Voltage Divider Resistor Picker

Discussion in 'Electronic Design' started by Tim, Feb 17, 2006.

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  1. Tim

    Tim Guest

    Hi,
    There are 480,000 different combinations of standard 1% resistor values. If
    you need 2.75 volts from a 5.00 volt reference, which of those 480,000 pairs
    will give you the closest result?

    For this example there are 9 resistor pairs that will get you to within
    0.5%, but one resistor pair will get you within 0.15%. Only 1 out of 480,000
    combinations is the best pair!!

    The Best Pair II resistor calculator program will calculate and display the
    twenty one best voltage divider resistor pairs, as well as the error
    voltages, percent error, "Perfect R2" and "R Thevenin" values. Results can
    be scaled to any decade of course.

    BestPair has been upgraded to Best Pair II. If you are interested you can
    get it with instant download delivery here -->
    http://www.velotec.com/BestPair.htm

    Thanks for looking.

    Cheers,
    Tim
    www.velotec.com
     
  2. JeffM

    JeffM Guest

  3. nospam

    nospam Guest

  4. Tim

    Tim Guest

    Yes - Please download and try the free program.

    If you find you do not like it please take a closer look at BestPair II -->
    http://www.velotec.com/BestPair.htm

    In seven years BestPair I had ZERO unsatisfied users.

    You get what you pay for.

    Thanks for looking.

    Cheers,
    Tim
    www.velotec.com
     
  5. Rich Grise

    Rich Grise Guest

    The number of times that I've had to select values from a range like
    that, I've done it "by hand" with a spreadsheet. ;-)

    Although, it would be kind of a fun programming project - maybe I'll put
    up a "divider calculator" web page. ;-)

    Cheers!
    Rich
     
  6. JeffM

    JeffM Guest

  7. redbelly

    redbelly Guest

    If they are 1% resistors, then NO pair will be within 0.15% !!!

    Mark
     
  8. Typically 1% resistors are within 0.15% or so.

    Nothing wrong with trying to get closer to the ideal values on analog
    stuff.


    Best regards,
    Spehro Pefhany
     
  9. The Phantom

    The Phantom Guest

    This isn't unqualifiedly true. Some pairs MAY be within 0.15%; some may not.
    What you want to say is that there is no guarantee that any particular pair will
    be within 0.15% when built with real 1% resistors.
     
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