Distributing power to many at once servos

[Grumpy_Mike]

@it_ross

My research has told me that voltage regulators (perhaps linear or perhaps bucks) would be the way to go here.

Buck converters are best, because they loose less power. A liner regulator simply burns off the excess power as heat.

The Adafruit servo shield output FETs can't supply that amount of current, so you need to rethink the driver requirements from that. See the data sheet of the chip it uses for the complete solutions.
See:-
PCA9685.pdf

You also need to consider power supply decoupling thought the system.

See my tutorial at:-

De-coupling Tutorial

De-coupling Once you get more than a handful of active components together you need to de-couple the power supply. What this is, and why, is described here. The problem When an otherwise good design works, but is erratic, unreliable or just goes crazy then nine time out of ten it is the power supply de-coupling. And you will find that the tenth time, turns out to be power supply de-coupling as well. So what is it, and why is it needed? Basically when an integrated circuit works it works by swi…