cglaeser 0 Posted January 19, 2011 A rather simple question, just curious. When connecting two or more DC devices (e.g. two devices communicating via RS232) and one or more of the devices have a separate DC wall-wart power supply, and the wall-wart AC plugs are not polarized, how is it that the ground of the two devices can be connected together without a potential between them? Can the DC output float separate from the AC wall-wart input? Best, Christopher Share this post Link to post Share on other sites
Tailbone215 0 Posted January 19, 2011 You're going through a transformer with the wall warts and it is isolated from ground. Not much of an issue even with switching supplies. Share this post Link to post Share on other sites
cglaeser 0 Posted January 19, 2011 You're going through a transformer with the wall warts and it is isolated from ground. Not much of an issue even with switching supplies. OK, yeah, that makes sense. The voltage in the secondary coil is proportional to the voltage in the primary coil and the number of turns in each, but otherwise they are isolated. Thanks. Best, Christopher Share this post Link to post Share on other sites
