Not really a question, just thaught that maybe someone might have a use for this, I designed it for use on an ATV, I am powering something of of the stator coil, and the voltage spikes would kill my sensitive electronics, and I just thaught that it would be possible for someone out there to use delicate electronic componets on the bot, so this simple circuit would keep you from fryin a part, wont fix and undervolt situation, but certanly can save you the hassle of replacing electrical parts, this is definatly not for use on motors, the output curent max is 1 amp. you could beef this circuit up, but I dont know why you would, this was designed to work in harsh, mud filled, and other wise non-electronics friendly enviroments, hense the water tight housing.
http://www30.brinkster.com/technikube/vreg/12vreg.html
A note, the material the capacitors are made out of makes a differance.