Asked — Edited
Here is a site that has a whole lot to offer for understanding how circuits work. It has lots of schematics for many handy projects that could be incorporated into a robot build. Well worth taking the time to explore this link.
Upgrade to ARC Pro
Synthiam ARC Pro is a cool new tool that will help unleash your creativity with programming robots in just seconds!
Have you heard of this one?
All About Circuits
@Troy... yeah that's another good site. I registered on their forum awhile back.
@thetechguru.... it's good to keep in pratice on these things. I have a solderless breadboard I use to build circuits.
To anyone who needs it...I have an electronic copy of the Digital Circuit "Engineers Notebook" by Forrest Mims if you need it. It is a treasure trove of digital circuits.