Stan: Thanks again! That all makes perfect sense!
I understand using a potentiometer as half of a voltage divider (the other side being a fixed resistance) to obtain a ratio that drives the gate of a transistor. So that enters into how the comparison is done with the target angle of a standard servo. That along with the magic chip and the H-bridge certainly covers what I was wondering about. Man, these little gadgets are awesome!
Now that I know approximately how they function, I think that I will look into hooking them up to some manual turnouts to make them into remotes. I won't be slamming them into position by just asking for the final angle. It will be incremental Servo.write calls with a well tuned delay in between.
