Anode driver needed for common cathode display

Discussion in 'General Electronics Chat' started by CollieJim, Apr 18, 2013.

  1. CollieJim

    Thread Starter Member

    Nov 27, 2004
    25
    0
    I have a large 4-digit, 7-segment, common cathode display which requires at least 7v to be visible.

    I'm using a 74HC138 to select the digit, and tried to use a 74HC238 for the anodes but it's very dim.

    Would some sort of buffer chip be useful here?

    I'm using a PIC16F1827 and a DS3232 I2C clock module.

    TIA
    Jim
     
  2. MMcLaren

    Well-Known Member

    Feb 14, 2010
    759
    116
    Hi Jim,

    Consider using a Micrel MIC5891 eight bit serial-to-parallel high voltage driver. It has separate VCC and VBB inputs and is perfect for those higher voltage multi-LED-per-segment displays.

    Cheerful regards, Mike

    [​IMG]
     
  3. CollieJim

    Thread Starter Member

    Nov 27, 2004
    25
    0
    Thanks. Just what I need.
     
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