SOLVED EMI shielding anyone have experience?

BobbyBubblehead · Apr 26, 2014

Looking for source material to enlighten myself as to the application of EMI shielding.

critical components to address, methods and materials.

I'm an EMI sponge for knowledge.

if you have any development experience then please share :thup:

myststix · Apr 26, 2014

Are you trying to shield it so that signals don't escape (easier) or that signals don't enter (harder)

BobbyBubblehead · Apr 26, 2014

looking to lower the radiation within the computer. screening an output card from its immediate environment in an effort to lower S/N ratio.

lowering antenna effect on internal cabling.

screening oscillators, noisy IC... etc.

the goal being an improvement in working environment for the signal to be generated and passed on.

BobbyBubblehead · Apr 29, 2014

not to worry... researched the various standards and ordered materials.
:chair:

foil hat and a ground wire for me...

BobbyBubblehead · Apr 29, 2014

fully shielded v semi floating.
ponder if there's any advantage to pulling the unwanted energy away from the signal termination over a full Faraday implementation?

freakdiablo · Apr 29, 2014

Can I ask, what are you trying to gain from this? There is some protection in most signals internally due to the simple fact that they are digital opposed to analog, as well as a fair amount of filtering and built in error correction on components that need it. If you are worried about line noise from something analog such as an internal sound card, wouldn't it just be easier to pick up an external DAC and call it a day?

Or is this all just hypothetical "if then" discussion?

Edit: by your OP, I'm guessing it's the latter. Sorry

BobbyBubblehead · Apr 30, 2014

dont troubles yourself... I asked companies that understand the situation "actual" Sorry :thup:

Adragontattoo · Apr 30, 2014

I still want to know what you are attempting to accomplish specifically?

A metal PC case if properly grounded is already a pretty effective Faraday cage.

wingman99 · Apr 30, 2014

What are you trying to do?

(G{in}[AK)TION] · Apr 30, 2014

whatever it is, it aint gonna foil the guberment haha!

>justjokingaround

BobbyBubblehead · Apr 30, 2014

freakdiablo said:
Edit: by your OP, I'm guessing it's the latter. Sorry

hey id get from up my *** if I were you. just had my morning coffee :thup:

BobbyBubblehead · Apr 30, 2014

(G{in}[AK)TION] said:
whatever it is, it aint gonna foil the guberment haha!

>justjokingaround

there to busy terraforming mars to bother me ^_^

:rofl:

BobbyBubblehead · May 2, 2014

So I downloaded a white paper on digital design.
looked into the various grades of implementation.
and got my foil, drain wire, copper ground plane mesh, EMI polymer abosrber... insulation etc.

and im playing nicely... thanks all :thup:

edit: I bought all my ferrite`s a couple of years back... slow project.

bob4933 · May 3, 2014

Can I ask what this is for? I can comment to some degree on it, but without context, its harder for me to say.

Turning your computer into a faraday cage may not be the most prudent method here haha.

FWIW, a quick "DIY" method of checking the quality of your EMI shielding is using your cell phone.

BobbyBubblehead · May 4, 2014

bob4933 said:
FWIW, a quick "DIY" method of checking the quality of your EMI shielding is using your cell phone.

I wrote that cell phone test in the general discussion too.

in short I am reducing various effects and implementing medical/military grade materials and methods of noise suppression.

accumulative terms its reaching my goal. been happy bunny with the differences its made over the past week.

I think once the rejected energy is in the right place I will try a grounding station to drain the unwanted nasties away from other equipment and further improve the integrity of my treasured digital signal.

Ben333 · May 4, 2014

Well... I won't be a nay-sayer! Interested in seeing your results, on whatever it is you're trying to do.

Personally, I'm working on a machine I'd like to use for hi-fi audio... and considering using a flexable PCI / PCIe riser and then placing the sound card in it's own enclosure. Yes, I know of SPDIF and USB solutions... but from what I read, there are some great internal options... why not try one of those and improve upon it?

Asking why a question was asked, or saying there's no point in trying is a great way to make yourself seem knowledgeable while being further in the dark than the OP.

BobbyBubblehead · May 4, 2014

Ben333 said:
Well... I won't be a nay-sayer! Interested in seeing your results, on whatever it is you're trying to do.

Personally, I'm working on a machine I'd like to use for hi-fi audio... and considering using a flexable PCI / PCIe riser and then placing the sound card in it's own enclosure. Yes, I know of SPDIF and USB solutions... but from what I read, there are some great internal options... why not try one of those and improve upon it?

Asking why a question was asked, or saying there's no point in trying is a great way to make yourself seem knowledgeable while being further in the dark than the OP.

I will pm you after ive finished watching this film. I can point you to some resource material and give you a run down of my findings and modifications.

I hope you get to employ some of the materials im experimenting with.
its not costly in modifying terms and I hope you will find these measures accumulate in effect to give a more natural analogue presentation.

I think the biggest set back with pc as a true source component is the sonic signature that carries from power and ground.

and yes usb gets a lot of attention these days but really the industry should focus on good power to digital spdif as opposed to a side step.

usb is great but we should be able to eliminate the need if we took its strengths and analyse the conditions that enable it to out perform most internal spdif solutions.

oh and when you look for that PCI riser... get a good one with an inclusive ground shield. I can also show you how to modify and ground it safely myself. (I shielded the riser myself in my situation)

Ben333 · May 4, 2014

Any pics / link to a thread on your setup?

BobbyBubblehead · May 4, 2014

codename frankenputer lol

Vlink 192 - replacing soon with audiobyte hydra x+ (dsd usb dac 24bit 384KHz)

sotm linear power (custom spec. thanks sotm)

Violectric V800 24bit 192KHz dac (soon to be modified I think)

DNM 3C (prototype 3B board before it became official)

3C power

DNM 40w 3D power amp (high tolerance version)

its power...

wilson benesch - series 2 square two

gives me a pretty wide bandwidth bottom line on whats going on

mostly dnm cables throughout. usb cable is clearer audio`s silver line with super suppressors (decent ferrites)
the aes ebu cable is a chord reference cable.

about $42,000 as a quick tot up... fair habbit :/

thats the main system... I have others

BobbyBubblehead · May 4, 2014

on a further note I would love to make all the atx cables from a single solid core wire. lower there magnetic field. suspect it would have to be an unfriendly gauge wire to handle the load though.
maybe one day...

SOLVED EMI shielding anyone have experience?

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