Thanks, Brendon. Hopefully the miniaturization offered by SMT reduces
the size of the antennas that radiate any trash. :) But that may be
wishful thinking -- W6GJB encountered massive noise on HF that he
tracked down to computer extension speakers with built-in power amps
that were powered from a USB port. I suspect that this sort of circuit
was used.
73, Jim K9YC
On Tue,3/8/2016 8:33 AM, Brendon Whateley wrote:
Guys, surface mount switch mode power supplies run at up to 4MHz (and
much more) nowadays in pursuit of efficiency and small size. A lot of
digital circuits have them embedded on the board to convert voltages
for low voltage/high current chip cores.
Here is the first design doc I could find:
http://www.digikey.com/en/articles/techzone/2015/feb/design-trade-offs-when-selecting-a-high-frequency-switching-regulator
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