This type of construction doesn't lend itself well to the flyback transformer in a SMPSU because the proximity losses are huge with that kind of winding layout.
If you're allowed to present the output from the secondary winding of such a transformer directly into the bathroom, the reason that you couldn't also use it as the input to a 5V power supply is what?
The point about bathroom shaver transformers is that they have to present a safe 240 V output. It's the 240 V aspect that makes that difficult.
If you wanted a bathroom-safe 5 V supply it could be done easily, without the need for that sort of transformer. Just use a "medical" 5 V power supply design and encapsulate it to prevent moisture ingress.
(It would be safe in practice; not necessarily legal I suppose.)
Maybe there is a market for bathroom-rated USB outlets.
Just jam an extra isolated winding on the shaver transformer, rectifier, regulator etc, though most shaver sockets are not powered unless a plug is inserted, so a switch on the sockets shutter as well.
Interesting idea, but what's the benefit of that over just measuring the current between each of the pins and the cpc using a known resistance in series?
Probably the benefit is ease of connection of test "probes".. Getting to the pins in a USB socket is bad enough. Getting to the pins in the pico-miniature plugs used to charge phones is also impossible with ordinary test probes.
True, but if it does destroy the charger in the process, you could just cut the lead and strip the wires. You could even solder/heat shrink it back together afterwards if it passes!
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