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Homework Help: Digital voltmeter

  1. Jul 16, 2008 #1
    This circuit was used to make a digital volt meter. What I'm confused about is the exact use of the potentiometer on the RHS of the diagram. I know is was used to set the "reference voltage" to 4V and all all output voltages from the meter would be from 0-3.999 volts when displayed. The potentiometer on the LHS is varied to change the input voltage.

    [img=http://img395.imageshack.us/img395/3872/71369663pz9.th.jpg]
    [img=http://img291.imageshack.us/img291/4333/68711262rj5.th.jpg]
    Thanks
     
    Last edited: Jul 16, 2008
  2. jcsd
  3. Jul 16, 2008 #2
    Get it now, nm
     
  4. Jul 16, 2008 #3

    berkeman

    User Avatar

    Staff: Mentor

    Well since you get it now....

    Quiz Question -- what specs would you check on that IC to be sure that its connections to the potentiometers were done correctly? What could potentially happen if a certain spec on those two pins weren't what you wanted?
     
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