Regular old 5V hobby servos can usually be safely connected directly to a microcontroller without any issues. When it comes to 6V servos (that also might be drawing sizable current), there doesn't seem to be as much information.
I've read that you can simply provide 6V to the + and - pins on the servo from a separate source and then provide the regular 5V control signal, but I doubt that this is the ideal solution.
What's the right way to control a (potentially high current-draw) 6V servo from a 5V microcontroller? Should the 6V supply just come from a voltage regulator and a couple of caps or is it important to have a more sophisticated voltage source?