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

David davidwhess at gmail.com
Thu Oct 13 21:07:41 EDT 2016

Even if they meet the CE or FCC requirements for unintentional
radiators, they can still screw up the short wave bands and more; many
are bad enough that I can see the noise they emit on an oscilloscope
with a shorted probe.  At least in the US, there are a *lot* of cheap
products with switching regulators which cause problems including CFL
and LED lamps and FCC enforcement is poor.

That confusion between the European Economic Area CE and the China
Export CE is just shrewd.

On Thu, 13 Oct 2016 17:57:02 -0500, you wrote:

>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

More information about the time-nuts mailing list