- I have something like the Kensington 33069...  what kind of amperage can it put out at 5V?
  (even when taking into account the cigarette lighter?)


http://www.trcelectronics.com/Meanwell/sd-25a-5.shtml
    5v @ 5A, $26

http://www.trcelectronics.com/Meanwell/sd-50a-5.shtml
    5v @ 10A, $32

http://store.mp3car.com/ProductDetails.asp?ProductCode=PWR%2D020&Show=TechSpecs
    5v @ 8A, 12v @ 3.3A, $90




- is there any problem with plugging multiple digital devices into the same input...?   eg. can one
  device put out a lot of ripple, and that affect one of the other devices connected?  Do multiple
  devices need isolation between them?