Hailey Posted August 21, 2016 Share Posted August 21, 2016 I just saw a new gavanic isolator from JCAT,which is in Aluminium box then i thought yeah!... it should be in an aluminium box not a plastic box because while we try to get rid of noises, we open the door for another noise to come in.so.. i tried to wrap it with 8ply of sheet and apllied some duct tape in sensitive area such as connector or pcb to avoid short curcuit. After finished it, i had to yell out loud... Holy...sh...., it sounds unbelieveable! PS. from my experiment, i found 10-12ply can shield broadband EMI. I wraped my phone and then called in from another phone. At 10ply, Phone was loss their connection. [ATTACH=CONFIG]28257[/ATTACH] [ATTACH=CONFIG]28258[/ATTACH] You're using 8 ply aluminum foil? Two layers? Sorry I'm a little confused here. Thanks... Link to comment
Hailey Posted August 21, 2016 Share Posted August 21, 2016 I will say that the Amber Regen is a very good device with the right dac. WIth R2R dacs like the Yggy(I have two) it doesnt do much. WIth some of the sabre dacs I have used it did an incredible job in improving audio quality. Let me add that the industrial Intona I have is the only add on device that improved the audio quality of the Yggy. It is connected to my imac . Right now I'm attaching Intona to my DAC via a USB A-B connector. Should I be attaching the Intona to my Mac Mini, then sending the cable to the DAC? Does it matter? Link to comment
Hailey Posted August 21, 2016 Share Posted August 21, 2016 Usb cable from Mac mini to Intona host port. Another USb cable from other side of the Intona to your dac. Do I need to use a second USB cable? Is there any reason why I shouldn't use a USB A-B stub? Link to comment
Hailey Posted August 21, 2016 Share Posted August 21, 2016 I did think of wrapping the outside but was worried that if it didn't have a ground it wouldn't work.... I ll try wrapping the outside tomorrow to see if I can get an effect... Wrap it like a turkey rough 3 times... So this is a faraday cage? In your opinion what changes made it worth the effort? BTW be careful and use ESD straps.. Just incase with fine FPGA inside being damaged.. Cheers and good luck Dave[emoji4] Sent from my SM-G900F using Computer Audiophile mobile app I wondered about that, too. Also what about using copper foil tape? Link to comment
Hailey Posted August 22, 2016 Share Posted August 22, 2016 Btw, Intona may benefit from about 20 hours of burn-in. I listened briefly upon installation, was underwhelmed (eg, I thought it made things worse), put the track on repeat play, left it blaring overnight. Quite a difference this morning. Has anyone else experienced this? Link to comment
Hailey Posted August 23, 2016 Share Posted August 23, 2016 Not 3 foils but 10 to 12 foils, bro.From my pre test, i tested by wrapping it over my mobile phone foil by foil. Then i called it from another phone, at 3 foils, the phone was still connected. Until 8 foils, there was no ring tone but kind of missed call. Until 10 foils, the 2 phones completely loss their connection. The reason that i tested it like that is.. Those frequency is Broadband RF (also wifi) which is determined as RFI/EMI. If phones loss their connection, RFI can't go through to PCB too. That's what i thought. ^^ Three wraps of copper foil will do it. And it'll look snazzy, too. Link to comment
Hailey Posted August 23, 2016 Share Posted August 23, 2016 Then it turn to be a present box instead. *_^ LOL..Did you hear any improvement? Could you review it for me a little bit? I'm going to try it out this afternoon. Will post review and pix.... Link to comment
Hailey Posted August 23, 2016 Share Posted August 23, 2016 Here's what I did. A bit rough. I can pretty it up later. It's 38 ga copper foil. Stops EMI dead. Oh yeah and just for the heck of it, here's the back of my Mac Mini... Link to comment
Hailey Posted August 23, 2016 Share Posted August 23, 2016 Won't have a chance to listen until tonight. I'll let you know... Link to comment
Hailey Posted August 23, 2016 Share Posted August 23, 2016 Oh! One more question.Did you ground it? and How to do it? Or you did it by attach the foil to USB connector? The foil sort of folds into the USB connectors. Link to comment
Hailey Posted August 23, 2016 Share Posted August 23, 2016 Fantastic ahaha. .A much neater job than I could do lol.. I was just going to try the inside as I have thin copper tape ,25mm wide.....Now we can answer the question of any perceived tonal shift good bad or nothing.... And it doesn't cost a fortune to try....[emoji23] Thanks ..your the star of the day[emoji93] Sent from my SM-G900F using Computer Audiophile mobile app If I've done it right I'll redo it later, taking measurements first then cutting the copper foil so I can get near corners. This was a quick-and-dirty. But I believe I correct grounded and I've got full coverage. Incidentally that's the thing that concerned me about copper tape on the inside. You'll need to make sure there isn't an errant ungrounded strip, otherwise it'll turn into a little EMI antenna. Whether you use foil or tape watch those edges. Razor sharp! P.S. It's not clear to me that this sort of shielding needs to be grounded. How is the shielding in satellite electronics grounded? P.P.S. Or perhaps I'm confusing "earth ground" with "chassis ground." Perhaps someone who knows might weigh in... P.P.P.S. As I think about it, wouldn't it make sense to ground on one end (via USB port) only, else you're defeating the galvanic isolation that is the whole point of this thing. Way out of my depth here. Link to comment
Hailey Posted August 23, 2016 Share Posted August 23, 2016 Ok well whatever it is, I appear to have done it right. Although I can't A-B Intona with and without shielding I can A-B with and without Intona and it is no contest. I'm inclined to think the shielding is partly responsible because I wasn't terribly blown away by the Intona before. Now I am. So, yes it appears to make a real difference. And, most important of all, it's more fun than just buying that JCAT thing. In the spirit of mad shielding, I also wrapped that A-B USB connector in copper. I don't know if it matters but I am really enjoying the result. Link to comment
Hailey Posted August 23, 2016 Share Posted August 23, 2016 Well, again, I look forward to hearing from anyone who knows what s/he's talking about. Link to comment
Hailey Posted August 23, 2016 Share Posted August 23, 2016 Are you aware that Intona have an ESD protection? That's not EMI though. Static discharge protection. Am I missing your point? Link to comment
Hailey Posted August 23, 2016 Share Posted August 23, 2016 https://en.m.wikipedia.org/wiki/Mu-metal This is the pro alloy mix for EMI RFI and explanation This is were I looked last year for products... From Holland... http://hollandshielding.com/125-Mu%20copper%20foil MU and EMI is basically shaping the field. RFI is shielded by the Faraday effect over a certain frequency. you can have gaps but the holes depend on the wavelength. ..I think.. Static likes to sit outside but it's the potential difference that causes damage flowing from hi to low. On FPGA'S IC'S a low static charge is like hitting your house with lightening due to the nano meter gaps on the chips.. ESD damage is a big problem in micro electronics.. So IC and circuit designers can only mitigate issues.... That's my basic knowledge and a reminder from wiki.... Sent from my SM-G900F using Computer Audiophile mobile app So this isn't absurd then... Link to comment
Hailey Posted August 24, 2016 Share Posted August 24, 2016 lovely work though Hailey Nice 1 [emoji4] Sent from my SM-G900F using Computer Audiophile mobile app Nine bucks for the copper foil, btw Link to comment
Hailey Posted August 24, 2016 Share Posted August 24, 2016 The electrical engineers out there must have fun watching us clueless ones fumble our way around... Link to comment
Hailey Posted August 24, 2016 Share Posted August 24, 2016 so.. please ask them why i wrapped my phone with 10 aluminium foils and then they loss their connection?That may be the same reason of what we are trying to do now... and also why JCAT put it in aluminium box? There must be some theories can explain it. Could not agree with you more. And, again, I could not be happier with the copper sheathing results. But here's something else I've been wondering...how do we know any of this stuff does what it says? I mean, how does something that takes its power from something galvanically isolate it from the thing that it's feeding Can anyone explain? My paranoid side wonders if the whole thing's a prank. Link to comment
Hailey Posted August 24, 2016 Share Posted August 24, 2016 Ok, Hailey.. It's not a big deal.If it doesn't work, take it off. That's it. Who gonna blame you if it didn't work. Nobody... Goodbye then... No, now I'm talking about the unit itself. Whether JCAT or Intona. How does it work? Link to comment
Hailey Posted August 24, 2016 Share Posted August 24, 2016 Anything can block radiation depending on what it's blocking and strength.There's a mega high powered X ray machine that can do fossils in Europe.. I think galvanic isolation is between transformers inducing a current across a boundary The FPGA'S reclocker the signal via the programmed CHIP.. http://www.apc.com/us/en/faqs/FA157465/ If our friend says he hears a difference then I am game to try the shielding and a ground wire from the copper to an earth point like a case screw as suggested in work for Potential EMC. It's just fun to try...and cheap.. Sent from my SM-G900F using Computer Audiophile mobile app Definitely try it and see what you think. I believe there is a difference. But I'm also wary of Dr Placebo's tricks. Link to comment
Hailey Posted August 24, 2016 Share Posted August 24, 2016 That's what i thought. I didn't mean it will sound better because of it do something with galvanic isolation stuff. I only meant RFI can go through plastic box to PCB inside. I think the easiest way is learn what REGEN and JCAT did with their aluminium box. Why? Why they have to add an extra cost? The cost which will make it to uncompetitive price. Because of those boxes are more expensive than plastic made. Regen isn't achieving galavanic isolation. Isotona and JCAT (allegedly) are. In fact, I wonder if the reason for the plastic case is that's how to insure galvanic isolation. Which suggests to me a) that EMI isn't an issue here and b) that JCAT may be snookering people. But what do I know? Link to comment
Hailey Posted August 24, 2016 Share Posted August 24, 2016 All i mentioned is about EMI issue not galvanic isolation.and your a ) offcourse, EMI isn't an issue here but finally it go to the same isuue. All we want is the cleanest signal without noise. if you think one noise is only an issue you concentrate to, and then let another kind of noise come in to signal path, i think it's not a good idea. not logical... and your b ) i think JCAT won't add an unnecessary extra cost for nothing. I'd love a definitive answer. I just don't know. I've removed the copper shielding. Does it sound better or worse? I haven't the faintest, I now realize. That tells me that I'm not picking up on any advantage one way or another. Some tweaks leap out at me. For example, the UpTone JS-2 LPS. The UpTone Regen USB (when I had the Benchmark DAC2). The WireWorld Starlight 7 USB cable. Others get returned right away. The Audioquest Jitterbug, for example. Then there's the Intona. Bought it used so no great loss. It doesn't seem to be doing any harm. But it doesn't appear to be doing much good, either. I don't know that you should assume that JCAT added the case for anything but cosmetic reasons. Maybe there's a technical reason, but design sells. Link to comment
Hailey Posted August 25, 2016 Share Posted August 25, 2016 most simple drill a hole near the top of the case and cut out to make a slot... For the USB cables.. Sent from my SM-G900F using Computer Audiophile mobile app Even simpler...just by a JCAT Link to comment
Hailey Posted August 26, 2016 Share Posted August 26, 2016 Or buy something here: http://www.lessemf.com/personal.html Link to comment
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