On 6/6/2018 12:36 PM, John C. Westmoreland, P.E. wrote:
That's an interesting hypothesis. Since USB is differential signaling -
it has some noise immunity; but I will definitely check into this.
Hum/buzz gets into our systems as a result of failure to implement
proper bonding between interconnected equipment, combined with improper
termination of shields within equipment by their designers. Study my
tutorial on this, which goes through both circuit analysis of the
problem and details good engineering practice.
http://k9yc.com/GroundingAndAudio.pdf
Or study N0AX's new ARRL book on the topic, which was inspired by my
tutorial, and to which I made many contributions.
73, Jim K9YC
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