On Wed, 5 Mar 2008 11:29:58 -0600, dgsvetan@rockwellcollins.com wrote:
>took it apart to see how Astron did the job. Answer: lots of ferrites
>and bypassing (in the correct places), as well as good board layout
>techniques.
And I'll emphasize two VERY important phrases in Dale's preceding
sentence, that he clearly understands but didn't articulate in detail --
"in the correct places" and "good board layout techniques." The
fundamental principles buried within these phrases are 1) current flows
in a loop and returns to its source; 2) the capacitor provides a path to
that source; and 3) the importance of keeping that current loop small,
thus minimizing the magnetic fields that are produced, as well as the
extent to which the wiring carrying that current acts as an antenna to
radiate the noise.
73,
Jim Brown K9YC
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