Cracked open one of those cheap adapters. They're based on the Power Integration LNK623. It needs a switching xfmr (custom) that has the primary, a feedback secondary, and at least one output secondary. Here are some photos:
<https://lh5.googleusercontent.com/-mMwU0b3Z3UA/U_12cGC7X8I/AAAAAAAAMQw/HZtZXHwAjzk/s1600/Adapter_07.jpg> <https://lh4.googleusercontent.com/-lOIpntX0big/U_12xXgpMBI/AAAAAAAAMQ4/YkGp2Q_SHtU/s1600/Adapter_06.jpg> To make it safe, you need to do at least two things: (1) Make sure the fuse reliably pops before the unit gets hot enough to ignite. (2) Use a split-bobbin transformer. Wind the primary, and feedback secondary on one side, and the output secondary (ies) on the other side. This will reduce the likelihood of electrocution. On this one, only 3 layers of transformer tape, and the enamel wire coating, isolate the secondary from the primary. Here's a split bobbin transformer: <https://lh4.googleusercontent.com/-MV6ukWGK4nI/U_14Ctvo7XI/AAAAAAAAMRE/W_njLHXXFWQ/s1600/Xfmr_Split_Bobbin.jpg> On Thursday, May 22, 2014 5:56:36 AM UTC-7, Nick wrote: > > http://www.bbc.co.uk/news/uk-27515446 > > Nick > -- 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/ef3e17ae-436e-4359-9617-90c1c6d6f745%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
