Got this with a digital camera kit. Found some interesting design aspects.
Firstly it appears there is no feedback mechanism between the primary and secondary at all that I can see. Or any voltage regulation on the secondary. I suspect it’s using the ratio of the transformer and doing feedback on primary. Hmm. It does output 5.8v out of the box which is more than a little high
. I don’t have a load handy to check it.
Secondly, clearly there is a problem in the factory with them blowing up from poor soldering and manufacturing tolerances because someone nearly scored around pads of the board around the transformer primary and the IC with a scalpel. First time I’ve seen that one
Saving grace is there is actually quite a lot of clearance between primary and secondary. No slots cut though.
Gore attached.