Keypad Decoder

Discussion in 'The Projects Forum' started by Khalid.ak, Jan 28, 2016.

  1. Khalid.ak

    Thread Starter New Member

    Mar 25, 2015
    11
    0
    I am building a keypad decoder using a circuit diagram below, however i have come across a problem where LED 2 and 4 will not light up, i have been unable to find the error i have been doing, so any help would appreciated
     
  2. Khalid.ak

    Thread Starter New Member

    Mar 25, 2015
    11
    0
    photo of my current board in correct orientation
     
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