CMcDougall wrote:^5v 1amp (some 2amp) USB adaptors for mobile phones /tablets /cameras /etc:
Yup, they're really useful.
Do be careful that you're buying 'good' ones, unbranded cheapy phone adaptors can be as bad as the one with the hard disk Mate-n-Lok style. (And by 'bad', I mean shock and fire hazards; a search for something like 'cheap charger danger' will find you loads of news stories.)
Incidentally, I have one of the HD ones. It's /very/ light. I fear that there might not be much in the way of components for things like safety.
and for the 12v, use a broadband hub box adaptor, they range from 1amp to 2.5
but need two mains plug sockets, not one
Modern 90mm floppy drives may actually only need 5V, so one of those USB adaptors might well be all you need.
It's also fairly easy to get 5V from 12V. If you don't need much current, then you can easily build a linear regulator (couple of capacitors and an 7805). If you need more, or you want an easy route, it looks like there's a fair few 5V switchmode DC-DC supplies on eBay
which would easily do the trick (note, I've not tested these personally, so I'm going by spec).