On 2/10/2018 10:38 AM, Scott Dorsey wrote:
Indeed, this is true. Switching supply noise does not sound like a hum.
Distinguishing hums, buzzes and hisses is half the struggle.
I've given a talk about that, with examples, a time or two. Most people
just say "hum" and leave those of us trying to help them out guessing
what the real problem is.
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