On Ground Loops and Star Grounds

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Speedskater

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On Ground Loops and Star Grounds
« on: 8 Jun 2017, 03:40 pm »
Jim Brown, pro audio EMI/RFI expert writes:

The primary way my recommendation differs from prior "wisdom" on the topic is that the prior wisdom ignored the issue of leakage current from the AC power system, which is how power line "buzz" couples into equipment that is interconnected with other equipment. That prior wisdom depends on the fictional concept of a "ground loop" as the cause of that buzz, ignores the fact that the shield of audio cables between equipment creates a loop with a "star ground," and is ignorant of a widespread cause of both buzz and RFI called "The Pin One Problem."

My method solves all of those problems, AND satisfies grounding and bonding requirements for RF and lightning protection.

FACT -- the ONLY way in which a LOOP affects a system is if it is in a magnetic field (from a poorly shielded power transformer, or in a place with improper AC wiring). In both of those situations, the received noise will be pure 60 Hz (hum) not buzz (triplen harmonics of 60 Hz -- 180, 360, 540, 720, etc).

http://www.audiosystemsgroup.com/publish.htm