I have four chargers for some hand held radios and I'm trying to incorporate them into a single power feed. They require 10v @ 500mA each. The problem I'm running into is finding a 10v power supply. What would be the easiest way to drop the voltage down if I purchased a 12v power supply? Everything I'm finding with suitable current is either 9v or 12v.

 

You can in series with 3 1N5400~5408 from 12V adapter.
12V adapter → (1N5400~5408) *3 → device

 

I knew I'd find the answer here! Thank you!