At first i couldn´t, therefore the previous post, but now i´ve found it in the archive:
US20120103646A1 - Power Cable with Twisted and Untwisted Wires to Reduce Ground Loop Voltages
- Google Patents
A bit more about the reasoning:
http://www.jensen-transformers.com/...est-of-Story-Whitlock-Fox-Generic-Version.pdf
and an application example with alleged improvement due to the wiring:
Examples | Twisted Power
Wow, that was a major rant, a whole chapter as it were.
As I explained, the ground loops designed into systems to meet code for safety can impact the system, specifically unwanted intrusion of the audio paths.
I have explained how it happens, why it happens, the route of communication between the aggressors and victims (using IEEE-1050 nomenclature), and where many electronic designers fail to consider the impact.
If you do not understand what I have been explaining, please ask. It's all simple EMC theory and practice.
jn
ps. What are we here for if not to answer questions from everybody regardless of education? Would it be possible to be a little more tolerant? Thanks.
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Ya gotta be careful with putting up that kind of stuff. PEC is for the most part a safety thing, sizing conductor, proper terminations...
I worry about some people deciding to cut the line cord safety grounds, and using some silly little fancy wires to create a new grounding scheme, one inadequate for the task of safety, like maybe a mechanically resonating box of dirt with plates inside...😀
Or, just as bad, running an independent earthing rod that is not near the service entrance, then wondering why a nearby lightning strike toasted everything in the house, possibly including the house..😱
jn
A cord construction like this was also presented in Linear Audio. I am too lazy to look up the issue and retype what was in the article but it gave a measurable difference.
It includes paralleling shielded cables and power cables with earth does it not to reduce loop area?
Absolutely. It is also how I made my 100 foot long power/signal snake as well, pic in my gallery.
It's also exactly what I recommend doing for the rca's from a ttable to pre, wrap the grounding wire around the rca's tightly to the preamp terminal post.
jn
I was convinced that 3 core mains cables to BSEN50525 were twisted but now I am not so sure, I'll need to cut into some cable to check.
I bought an oxygen RCA cable a year ago. The electrons are massaged in it and aligned to the south. That gives a crystal clear sound. When I finish listening to music, I also heal cancer. I earn $ 5000 a day!
Thanks but I was more thinking of this from Bil Whitlock here
particularly slides 61 & 62 but they are all informative slides, actually
Yah, I remember that presentation. I had put in an errata page covering everything he was not correct on. I'll have to figure out where it is.
On those pages if you note, he is only concerned with IR drop of the ground currents. Back in 2012, he had never considered how those currents flow within chassis.
ps...aha, found it..it was among correspondence I had with Bill..
page 6. I have a t-shirt almost like that, but the helmet has GUT across the top..
page 14. There is no such thing as inductance of one wire, it needs a loop to measure. A 10 foot length of zip would be about 2 uH, he's measuring the loop formed by the wire and the test leads.
Page 22, he shows an autotransformer and calls it a transformer. On the west coast of the USA, they are indeed transformers. You can tell by the number of hv bushings on the top.
page 31. While ### accused me of wanting to redesign the grid, Whitlock does indeed do just that, at least the conduit runs within buildings.
Page 32. Not sure how to approach this. The exact midpoint is not a magnetic null zone. That error doesn't ruin any following discussion though.
page 35. Note the three orders of magnitude drop as a consequence of twisting L-N.
page 43. He did not mention that there can be ground differences between outlets in a daisy chain by coupling between the meter leads and the ground conductor. He incorrectly thinks only IR drop here, yet does indeed consider induction throughout the paper.
page 53. His understanding of sub wavelength mismatched T-lines needs work. His statement however, is accurate when at least one end is terminated matched.
page 83..""The pin 1 problem- a designed in defect""..truer words were never spoken. He should add "and currents along the chassis".
page 99. He still needs to learn about sub wavelength t-lines where both ends are mismatched. Otherwise, good slide.
page 115 EXCELLENT...He finally addressed the pin 1 problem for outputs... man, I've harped on that for years.
page 125..""commerce without conscience"" what a great phrase...
page 209. Ground isolators..I absolutely agree with him, I worked in a diode manu arena, and agree with him 1000 percent..
jn
Excellent, jn - it's always good to get other experts views & updates on this topic as no one person is unequivocally correct & has the full picture. I'll keep your addendums & corrections with Whitlocks document.
He does mention leakage currents (UL standard levels allowed on chassis) & shows their pathways (including that "they will always flow in signal cables connected to equipment powered by 2 prong AC plugs" but maybe you have more to add?
He does mention leakage currents (UL standard levels allowed on chassis) & shows their pathways (including that "they will always flow in signal cables connected to equipment powered by 2 prong AC plugs" but maybe you have more to add?
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Nitpicky, is good when it's backed with real knowledge of the subject which no one doubts you have
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