Please help me out

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

  1. painbird7

    Thread Starter New Member

    May 10, 2006

    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

    Retired Moderator

    Jan 28, 2005
    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.

  3. Gadget

    Distinguished Member

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