I'd go to Radio Shack or such and buy one. I had one for my Gateway
that worked great for several years. I bought mine from Gateway.

DOug

"Colin Lowe" wrote in message
...
Hi all,
I want to make a convertor to step up the voltage from 12vdc to 19vdc to
power my laptop. The mains adaptor I have for the laptop is rated 19vdc
and
3.16A. Thefore I want to step-up the voltage from the 12vdc boat supply to
19vdc with a capacity of 3.16A max current.
Do you have a circuit or what other options do I have?

Thanks
Colin