Oh boy, this sounds bad. First your going to need to get your original power adapter. Somehow learn Japanese and call the Nintendo Japanese support line. Do not tell them that you fried it, definitely don't tell them that you made your own power supply. Just tell them that you plugged it in and it stopped working. Keep it short and sweet, and act like you know nothing about electronics.
I hope for the best!
PS- I remember back in highschool our geography class picked fantasy vacation places, we had to arrange our economical finances and plan our trips by time. We had to find motels and find out what we were going to do when we got to our destination. I picked Jakarta, I remember it being a cool place...from looking at pictures. I can't really remember what I did there though, wish I could.