Common Anode 7 segment display resistor

Discussion in 'The Projects Forum' started by rmazumder, Aug 2, 2014.

  1. rmazumder

    Thread Starter New Member

    Aug 2, 2014
    I have a common anode 7 segment display and in all the circuit example i see connection from vcc to common anode pins and from segment pins to current limiting resistor to ground.

    This way I need 7 resistor. Will it not work if I connect the current limiting resistor from VCC to the common anode and segment pin directly to the ground, as this way I will need only two resistor.

    Excuse me if it is a lame question as I am new to elecronics I am getting confused here.

    Thanks in Advance,
  2. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
    It will work, but not well. A "1" will appear much brighter than an "8".

    Seven segments require more current than two. A single current limiting resistor will not adjust to the varying load.
    rmazumder likes this.
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    No, you need all the resistors, as one resistor alone makes the leds all in parallel,so they don't work.
    rmazumder likes this.