3 thoughts on “Multiplex LED schematic”

  1. philihp's avatar philihp 14 September 2010 / 04:07

    What is the reason for having the 1k R9, R10, and R11 resistors?

    Reply
    • nzlamb's avatar nzlamb 16 September 2010 / 23:19

      Current limiting but they are not essential.

      Reply
      • Carlos's avatar Carlos 20 March 2014 / 18:03

        What do you mean by saying they are not essential? They are! Otherwise you may burn the transistor (or the Arduino)

Leave a comment