Join Date: Jan 2009
Location: Macclesfield, Cheshire, UK
Mentioned: 0 Post(s)
two routes in my books
1) fit a 12v auto socket + buy a 12vplug with USB output
2) fit a USB socket with voltage regulator (get a simple voltage regulator + two smoothing capacitors.
personally unless you know what you are doing I'd suggest option 1
option 2 isn't difficult, you'd need to work out what the maximum current on the usb feed is and work out if you need some form of heat sink is required.
the real benefit of option 1 to my mind is that you have a 12v standard socket available for other uses if required