On Wed,5/31/2017 11:32 AM, Stuart Rohre wrote:
What about insulating both sides of the audio feed to the headphone
jack? That way, you eliminate a chassis ground loop at the headphones
connector.
There is no such thing as a "ground loop." The "buzz" that we often
blame on these mythical "ground loops" is really leakage current from
the AC power line. There's a complete description of the mechanism in
this Power Point. Much of the material here formed the basis for N0AX's
new ARRL book on Grounding and Bonding.
http://k9yc.com/GroundingAndAudio.pdf
73, Jim K9YC
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