Ah, ok then. I don't know much about electronics (in fact, I would love to learn more), so I'm a little bit paranoid about voltages.
I had a Phantom System (a Brazilian famiclone) when I was a kid, and it fried and smoked... Since then, I'm kinda worried about my consoles.
It's really easy to find Mega Drive power supplies around her, both original and 3rd party.
The thing is, a original MD power supply cost as much as a 500w step-down transformer (127v to 100v) around here, so, what would be the best choice between these two?