Display scientific notation from BCD in registry

Discussion in 'General Electronics Chat' started by ModusPwnd, Jun 12, 2011.

  1. ModusPwnd

    Thread Starter New Member

    Apr 29, 2011

    I have constructed a voltmeter using the single slope ADC method. The output I get is a number of clock cycles. I can display this number using a series of LED displays (TIL311), along with some counters(7490) and register(HCT574).

    What I would like to do is display this number in scientific notation where I have two LED's displaying the first two significant figures, and another LED displaying the order of magnitude. I believe that I can get the order of magnitude by doing a series of divide by ten counters... but I can quite get the details right. But I am completely clueless on how to display the leading two digits (and not zeros if the number is low).

    Any ideas? Thanks!
  2. atferrari

    AAC Fanatic!

    Jan 6, 2004
    Could you show two or three writen examples of what you want to display?

    That could help, first than nobody else, to you, I think.
  3. SgtWookie


    Jul 17, 2007
    The TIL311 displays have been obsolete for quite some time. Even if you can find them, you will pay quite a premium price for them.

    Similar type replacements cost around $38 per digit.

    Are you certain that you want to use a hex LED display?