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In Reply to: RE: Linear Power Supply on Mac Mini posted by AbeCollins on December 20, 2014 at 18:13:11
You should never place your power supply next to the Mini, or to audio equipment. The EM from the large transformer is very significant and goes over the top on an EM meter such as the Trifiel
0.5 m is better; 1m on the floor and away from anything is better still. You need to pay attention to your chord.
Follow Ups:
If I were testing for EM I might move the Mac Mini, but I'm not.
You probably didn't gather from my comments that at this point, it was simply a preliminary functional test, i.e. does the power supply work, does the filter work, does the cable work, does the Mac still work?
That's it. I'll chase ghosts later.
"goes over the top on an EM meter such as the Trifiel..."
Oh, this one I just Googled up?...
============
The TriField EMF Meter, Detect Stress and Ghosts
www.coreonehealth.com/trifield-100xe-meter.html
The TriField 100XE meter is unique in that it can measure magnetic fields, electric fields, and radio/microwave fields. Previously you would require three different ..."
============
Ghosts are SUCH an invidious problem with home audio...
Naturally knowing your device's susceptibility is a crucial factor for EMI. If you don't know that then field measurements don't have a ghost of a chance of being very helpful.
Scientifical Rick
No ghosts on the manufacturer's web site. I wouldn't hold it against a company if an independent retail outlet also sells tin-foil hats.
I can confirm that my Nak CR-7 cassette deck is sensitive to magnetic fields at the power line frequency. It was necessary to move it several feet away from equipment that had a 60 Hz power transformer. However, I didn't need any meters to detect theghostshum. Just put a blank tape in the machine, press PLAY, and turn the volume way up. (One would expect a tape deck to be sensitive to magnetic fields, unless it is a behemoth with lots of mu metal shielding.}
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
As you stated, you didn't need a ghost meter to easily prove that your tape deck is sensitive to magnetic fields. Fundamentally, that's how a tape deck works.
However, I'd love for someone to prove that placing a well shielded music server computer 3 feet from a shielded power supply vs. 6 inches away is going affect the computer.
No doubt someone will hear the difference. ;-)
Since we're splitting hairs how about this... Which sounds better, having your computer within 6 inches of a well shielded linear power supply or a 12v battery? Does it matter? Why?
you don't understand or get the fundamentals right (its easy to do so), then there is no point in spending several hundred dollars experimenting with power supplies.
Do it the 'conviction' way (can't see why or hear a difference), and any result you get has no generalised meaning. It will only lead or mislead inmates.
Fred, instead of your usual empty commentary, why not simply answer the questions I posed in my post to Tony?
This should be real simple for you since you seem to 'understand and get the fundamentals'. Please share.
of discussing why you have put 2 EM generators next to each other, you wanted to divert attention on why I won't discuss some aspects with TL.
I have made it very clear here that I will not engage in answering senseless questions or points.
"I have made it very clear here that I will not engage in answering senseless questions or points."
Fred,
I have over 20 years experience asking "senseless" questions of engineers. That was part of my job as a "Corporate Consulting Engineer". On review boards and funding boards I did this to determine which projects should be cancelled or funded. On job interviews I did this to determine which people to hire. When mentoring people, I did this to get people to think. (I believe this is called "Socratic Method".) There were several of us who worked the same way. In addition to using the answers to ascertain competences, we used the process to evaluate personality, as in "easy to work with" and "difficult to work with". So people were binned into four boxes:
competent, easy to work with
competent, difficult to work with
incompetent, easy to work with
incompetent, difficult to work with.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
If instead of discussing why you have put 2 EM generators next to each other, you wanted to divert attention on why I won't discuss some aspects with TL.
I told you why. Because I am not concerned with the potential for electromagnetic interference in my preliminary functional testing. In this case the potential for EM matters not. Are you unable to comprehend that?
you don't even use good practice from the start, what is the point of what you are trying to do?
Fred, are you having fun badgering me or are you just stupid? I hope it's the former but I have my doubts.
Edits: 12/22/14
Let inmates make their own judgement.
Many already have.
doesn't. can't. won't.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
That's what I figured but it was worth the ask.
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