strykeroz:
cazz:
hmm ok so I have to maybe scale down if I going to use it on VCC, AREF and AVCC ?I mean if I read the scheme right the plug can have 5-8v??
If by "scale down" you mean ensure your input voltage is 5V, yes. If you have an external 5V source you can use that without regulation in the same way as the 5V is drawn on the Arduino design directly from USB. Be sure to refer to the datasheet for the particular ATMega you're using for the range of acceptable voltages allowed at VCC.
Cheers ! Geoff
hmm ok, then it is a good idea to use a 5v voltage regulators to be sure.