So I'm building a robot that includes the following ...
Arduino Mega 2560 ( requires 5V, but ideally 9V? )
Arduino WiFi Shield ( powered by Arduino )
Adafruit 12-bit 16 channel servo controller ( or possibly my Pololu 24 channel job ) ( external 5V power, 6V Max )
I'd like to run this off a deck of eight D batteries.
I don't want to fry anything and I want to hook this up right.
Do I understand correctly that I should build two voltage regulator circuits,
one with an LM7809 for the Mega,
one with an LM7805 for the servo controller,
and I can share the same 12V power supply?
Should the 5V regulator hang off the output of 9V regulator, or directly off the 12V supply?
Finally, I've seen more than one voltage regulator schematic out there with a variety of configurations. Can anyone recommend one? Would I be better off buying a pre-made voltage regulator for ~$8?
Any feedback would be greatly appreciated!