74LS47D and 7 segment

Discussion in 'The Projects Forum' started by arcteryx, Feb 15, 2011.

  1. arcteryx

    Thread Starter New Member

    Feb 14, 2011
    8
    0
    I'm trying to do a simple circuit. The problem is the 7 segment won't light up.
    Can anyone help me?I attach the schematic diagram.Thanks!
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    BI/RBI is grounded, which forces the display to be off.
    Either leave it disconnected, or connected to 5v.
     
  3. arcteryx

    Thread Starter New Member

    Feb 14, 2011
    8
    0
    Alright!thanks!it's working right now.i change the pull up resistor to 221ohm and it's working!thanks!
     
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