[time-nuts] 4 KV Power Supply Recommendations

Chuck Harris cfharris at erols.com
Mon Jan 18 22:54:18 UTC 2010


Well, they don't have to filter it at all, as long as they stay within
the ISM band they are golden.  The 1W peak is concerning, though, for
health reasons. I guess you should keep your head far, far away.

The switching supplies showed up first in the coffee cup sized ovens,
and are now in just about everything.  They add 100KHz hash to the
chirpy signal from the magnetron.  They make the $50 microwave a reality.

-Chuck Harris

Didier Juges wrote:
> I could not resist, so I checked my relatively expensive Sears/Kenmore
> microwave oven.
> The results are there:
> http://www.ko4bb.com/Test_Equipment/Microwave_oven_leakage/
> 
> In one word, dismal. Almost 1W peak power leakage at 1 foot, and almost
> 100MHz occupied bandwidth.
> 
> I looked with a crystal detector driving a scope, and it is obvious the unit
> is driven from a 60Hz transformer with half wave rectification, and has no
> filtering whatsoever, like the first Microwave oven I have ever opened (a 20
> years old model long dead).
> 
> Didier KO4BB



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