In article .com,
wrote:
It certainly seems strange. Most SMPS are just outside the audio range
but well below RF. About 30 kHz being typical.

cost cutting exercise, higher frequency equals less inductor. Would work
if short leads used. If they marked the transformers clearly as only for
use with say 2' leads they could avoid a lot of returns and complaints.

I'd rather not have a device with an output in the RF spectrum unless
really necessary.

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*Why isn't there mouse-flavoured cat food?

Dave Plowman London SW
To e-mail, change noise into sound.