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Dennis@home

On 29/05/2016 09:55, wrote:

There is a very thin barrier between mains and usb output. If it
breaks down you're fried. A great number of noncompliant chargers
exist that have very inadequate insulation. I would not do it.

And yet some of the really cheap Chinese stuff is done well, like the
relay board for my arduino. They have routed an air gap around the
common pin to separate it from the 5V coil which is at the same end.

It makes you wonder who designs some of the stuff.