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Hi Fabio Mine is working at 24 volt,
De-solder the fuse which says 16 volts on it and replace it by an automotiv fuse. Look in youtube.
You need 24 volts fans and a 24 volt hotend.
My heated bed was getting his current via an external MOSFET board. It would burn the original mosfet on the Ramps.
You have to power your Arduino seperatly and desolder the diode which provides the Arduino from 5 volt.
IF YOU HAVE ANY QUESTIONS LET ME KNOW
Of course you can do it with a 12 and 24v powersupply. In that case only the 24 volts go to the external mosfet unit and everything else is powered by 12 volt