Hi,
I recently bought for my boss an APC notebook case (named TravelPower), which comes with a universal adapter that might work for you, you can buy the adapter separately, although the case is very nice, and not much more expensive to buy as a pack. I know you can change the voltage and amperage according to the notebook you have, and it charges PDA's and mobiles too. Check it out at
www.apc.com.
Regards, Ela.