hey, I had a revelation @ dinner tonight (dinner took 3 hours, I had a little time to think), when you posted about a matrix and 20 connections I didn't understand until tonight, (please tell me if I'm wrong) to do this I would have 10 rows of 10 columns. I would connect the anode of each LED to a PNP transistor in each column and the cathode of each LED to a NPN transistor in each row. 10 + 10 = 20 connections correct? Each transistor would have to have a current rating of each LED x 10? I didn't google this, I have just been mulling this over for a day or two and this is what I come up with, hope it's correct. I understand more & better when I figure this stuff out on my own. So for my project I have to use some shift registers (+ output? for NPN) and add some inverters ( to take + output to - for PNP), add some latches to keep each LED on (until reset), and maybe a 555 monostable for my ending delay reset?
Thanks for the help
C