Two 4051's to drive 8x8 LED matrix - interference

Using Arduino LEDs and Multiplexing
10

Thanks now I can see exactly what is wrong.

  1. You should not have any resistors in the +5V supply to the chip.
  2. A series resistor of 2K2 in the common input to the selector is way too high. This needs to be in the order of 100R or so.

Having said that read my other concerns about this design, especial the bit about having a 1 to 64 on / off ratio of the LED the LED is always going to be dim.