I saw Adafruit's weekly New Products video for 1/6 and I saw the robot chassis kit they had. I thought that was cool and decided to build a robot, without consulting any kits or anything- just my minimal knowledge of electronics and my less minimal knowledge of programming.
1×
UBEC DC/DC Step-Down (Buck) Converter - 5V @ 3A output
https://www.adafruit.com/products/1385 Much better than the 7805s that made my room into a battery graveyard.