[time-nuts] For those that insist on using switching power supplies

Graham / KE9H ke9h.graham at gmail.com
Thu Oct 13 18:57:02 EDT 2016

Actually, if they have the "CE" stamp on the product, then they have very
specific radio interference limits that they must test and meet.
It must have been tested, certified, and the certification package
available for inspection.

Whether they actually met it, then pulled the interference supression parts
off the board as a "cost reduction" as is common in no-name computer power
supplies, or whether it never met it to begin with, is for you to
speculate.  Some suppliers will explain to you that "CE" means China
Export, not that it meets the consolidated European safety and electrical

--- Graham

On Thu, Oct 13, 2016 at 5:25 PM, Nick Sayer via time-nuts <
time-nuts at febo.com> wrote:

> > On Oct 13, 2016, at 6:05 AM, Van Horn, David <david.vanhorn@
> backcountryaccess.com> wrote:
> >
> > To be fair here, phone chargers have almost no requirement to be quiet
> other than conducted and radiated emissions limits.
> > It’s charging a battery.
> Not quite. They power the device in question *while* they’re charging the
> battery. Now, I’ll admit that powering a phone is a much lower bar than
> powering, say, an audio amplifier, but I’d also say that some of the
> devices on that page were pumping out way more garbage than even any
> digital system should have to put up with.
> >
> > As a designer of some fairly quiet SMPS systems, this feels like “look
> how bad a family car this tractor is".
> Well, there’s some of that, but the worst offenders were counterfeit
> devices that were pumping out unreasonable levels. To your analogy, they
> were the outer shell of a family car with a the engine from an Edsel
> installed in it without a muffler or any emissions controls fed from an
> open bucket of gasoline sitting on the passenger’s seat.
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