I dug out this schematic of the very first robot I ever made, which used relays to drive the motors. Think that is part of the reason I used the relay in the previous post -- so I could understand how the transistor turns them on and off. I have felt puzzled for years after building that gosh darn robot. Now I can see why -- the schematic is like spaghetti -- I can give my ' inner sixteen year old' electronics newbie a break. Apparently the -6/+6 gives directional control via the relay, pretty clever, eh?
That's all hand-drawn, serious geek points.
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