I need electric specs of US neogeo cartidge power supply

I'm a spanish Neo·Geo fan and some time ago I was lucky and I could get a american Neo·Geo cartigde system, but it had not the US power supply. I used the european power supply, that works too, but with some problems: there is a noise constant and interference in both image and sound, overall in the headphones output, and I cannot enjoy playing games with them, and it's a pity, beacuse this perturbing noise.
I would like to know to the minium detail the electric specifications of the us power supply of the neogeo cartidge.
If you could say me to my e-mail it would be a great favor. Thanks a lot.

In both regions, some operate on 10V 1.2A and some operate on 5V 3A. The 10V ones are the same as a Mega Drive/Genesis PSU.

I'd recommend checking what you have and perhaps trying the other spec. Also make sure you have the right style - AC or DC. Should be DC, methinks!

Plus, if you get an unofficial PSU get a REGULATED one