I'm installing a carpc and I want to run a powered USB hub. The AC adapter converts to a 5v dc 2.5 amps. Been many years since I've built electronics, but I understand the concepts. Trying to figure out how to step down the voltage and maintain the amps. I've read several posts on here, but none seem to require such high amps. This seems a simple problem, but I'm lost on how to do it.