If all you want is to get 5Vdc rom the mains, a USB charger seems like a very attractive option. They are usually less than US$5 and occupy about 1cu in (plus the power plug). My initial concern would be safety isolation, but some of these will surely be UL listed or CE qualified.
However, if you are doing an engineering laboratory exercise requiring using a 6.3vac source then this is almost interesting. It should be possible to build a buck-boost regulator that will tolerate a very wide range of unregulated inputs. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/c9e523cc-fd8d-473e-a7b3-4a41b6f5ab2a%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
