Graymark’s Scooter Model 601A

scooterHere’s an inexpensive kit from Graymark to help you learn motor theory, transistor switching and R/C time constant circuits. Comes with an excellent instruction book of lessons, schematics and troubleshooting guide. Scooter changes direction when you clap your hands or when it hits an object. See KrisTech’s independent First-Person, First-Robot Review — $16.95 Continue reading