Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

While I was in the military, I had several assignments to countries that used 220 volts.
First thing after getting there was to purchase several 220-110 volt converters for my 110 volt devices.
These were always simple auto-transformers.  They were either a metal or plastic box ( depending on power rating) with  a grounded Euro 220 v plug  on a cord. On the box was a polarized grounded 3  prong 110 volt  socket.  If everything is plugged in the way it should be there are no problems with auto transformers. 
DuWayne
KV4QB