Cheap LED Matrix

Using Arduino LEDs and Multiplexing
14

LarryD:
What is a BOOK?

http://www.electronics-tutorials.ws/index.html

I think this is going to be my book. Thanks!

CrossRoads:
$25 is nuts - go to maxim-ic.com and request a sample in DIP footprint. The part works very nice.

This looks great, a free sample is way better than $25.

CrossRoads:
There is no difference between common cathode & common anode:

Could someone else please clarify this, there is two different answers now.