Please help me out

Discussion in 'General Electronics Chat' started by painbird7, May 10, 2006.

  1. painbird7

    Thread Starter New Member

    May 10, 2006
    1
    0
    Hi

    I have a project from digital fundamentals class to build a simple

    calculator circuit that performs add function, subtract function and

    display results(21/2 digit).

    here is my question,

    what does 21/2 digit really mean? is that a name of a display device?

    or 21 inputs and 2 outputs?

    thank you for sharing your knowledges
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    The reference to 2 and 1/2 digits typically means that the display has three digit positions with the two right most digits in the display capable of taking on the values 0 through 9 and the remaining leftmost digit is restricted to the digits 0 or 1 and in some displays the leftmost digit can display a 2. The reference to 1/2 digit refers to the fact that the leftmost digit is limited in the range of numbers it can display.

    hgmjr
     
  3. Gadget

    Distinguished Member

    Jan 10, 2006
    613
    0
    That pretty much it. Cheap digital meters are often 2 1/2 digit.... max count normally 199
     
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