[600MRG] WD2XSH/20

[John Molnar]

NO GOOD DEED GOES UNPUNISHED.
I have eliminated virtually every switcher in the QTH, except the TV. which
has been wrapped in foil with its own ground rod and the power cord strung
with ferrite.

I have found the worst offenders are the crappy little ones provided with
Kindle readers, cell phones, and laptop bricks.  The "Magic Jack" PS was
the worst offender, I took joy in crushing the little pig.  All have been
replaced with linear bricks.

John XKA


On Sun, Nov 10, 2013 at 3:02 PM, Rudy Severns <n6lf at arrl.net> wrote:

> If any of you doubt that you will be punished for your sins let me tell
> you a little story.
>
> Beginning some 40+ years ago I was a designer of switching power supplies
> when they first became significant.  Initially I was designing and
> promoting switchers running at 20 kHz or so.  But then I had the bright
> idea that you could run at much higher frequencies, even 600 kHz or higher,
> which I proceeded to demonstrate with actual converters in a series of IEEE
> technical papers.  My work was well received and I was elected a Fellow of
> the IEEE for this work.  Not too long afterward I spent several years as an
> applications manager at several semiconductor companies, primarily
> promoting MOSFET's for use in switching supplies.  The use of power MOSFETs
> made it much easier to operate at frequencies well above 100 kHz.
>
> I played a role in promoting high frequency switching power supplies.  Now
> I am being driven nuts by switching power supply noise!  There is
> comeuppance in the world!  I have been rewarded for my sins.
>
> 73, Rudy
>
>
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