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Shockingly piss-poor USB power supply

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mikeselectricstuff:
A switchmode mains supply with one transistor.... guess how well it performs...?

firewalker:
A killer PSU, ftw.  :P

Alexander.

EEVblog:
I was pleasantly surprised at how bad it actually was!  :o

Dave.

Psi:
My guess would be that, to save money, the manufacture reused a plastic case made for some other unit.
Either that or they ran out of the correct case so used whatever they had available

So it ended up with the wrong specs on it.

That would also explain why the pcb doesn't fit very well and doesn't use the proper guide rails in the case.

Sadly all they really care about is that it has enough current for the product they ship it to run.

Bored@Work:
Nice dissection.

Such Chinese power supplies regularly show up in the weekly reports of the EU's "rapid" alert system for non-food products (RAPEX). And you can be sure when even the EU bureaucrats manage to regularly pick up some that the problem is actually epidemic. The criminals really don't care if they kill people.

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