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You should look at a different kind of power supply as wall adapters aren't a reliable voltage source: the more current you pull from them, the lower the voltage tends to go. So when most of your servos are idle the pack may be supplying say 9 volts to the remaining active servos and when all the servos are active they may be getting about 6 volts.For the setup your looking at I'd buy a baterry pack with a charger or some battery holders and individaul cells and a simple charger for them, then make up a power pack of your own. I know they're both more expensive than the power pack option but they are the better and cheaper of many solutions.N.B. If you're able you can convert an old pc psu for a lab supply. It'll provide more than you need (5V@10Amp(ish)) and total cost of parts for conversion inculding screw type banana terminals will only be around £5.
you could use the mighty usb port and just use the power pins. if you use a regulator which you should it will let the right amount of current through to your mcu.
Just wonder, how does a servo 'take' the amount of current it needs? I mean what actually control the amount of current intake by the servo?