Geek toy

Below is a link to a neat on-line digital circuit logic tester. You can drag a power source onto the work surface. Then drag out various logic gates and on/off switches, and connect those to LEDs, and then see how your logic circuits work.

ALL computers are essentally made up of just three logic gates: AND, OR, and NOT. I would like to get a better understanding of this stuff only because I am curious. I don't think there is any use of this for a casual user other than for the puzzle solving aspect of it. However, I might be able to go to radio shack and buy bread boards, transistors, a soldering gun, etc. and make some neat stuff, but I am not sure yet.
Digital circuit tester