Ferrite donut, how do I put it on?

S

Skarth

Gawd
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Ok, I'm building a computer and have found a ferrite donut that came with the case, I know about the whole RMI thing, but I want to know where I put the donut and which wires to run through it. I have USB, power, and audio cables that go to my case, do I run all those through them? do I put the ferrite as near the case or motherboard part of the cable?
 
It's EMI, ElectroMagnetic Interference. I don't know what RMI is.

The ferrite core does not really matter. Granted they can be extremely good at absorbing RF energy, but in reality they are only there to satisfy stupid government regulations. The likelyhood of actually having issues is slim to none. Toss it back in the box and forget about it.

Typically, you would want the ferrite as close to the source as possible.

Another thing, it's very odd IMO that the case came with a ferrite. Usually it's highly dependant on the electronics, board layout, filtering employed, components and oscillators used. Makes little sense for a generic computer case manufacturer to think that they need to ship a ferrite with it.
 
Your wires that run to the front panel go through it.

They go throught it, come out the other end, then go back thought it again, so they make like a loop around the outer ring.

Put the ferrite core close tot he motherboard, but not touching anything.
 
SarverSystems said:
Thats if you really think you need to use it in the first place. Very few cases have them any more. It must be an old case youhave.
Click to expand...

It's a brand new coolermaster centurion 5.
 
I got one with my cavalier too, i just put it somewhere in the middle of the cable, wound around like that picture, to help weigh the cables down for wire management.
 
SarverSystems said:
Your wires that run to the front panel go through it.

They go throught it, come out the other end, then go back thought it again, so they make like a loop around the outer ring.

Put the ferrite core close tot he motherboard, but not touching anything.
Click to expand...
Ferrite cores are not conductive. Youcan put them right up agains condicute traces or parts. They are however very brittle. IF they are up close to something and you move your case around alot, I can imagine it going thwack thwack thwack and cracking and crumbling.

Ferrite dust is not fun, neither are splinters.
 
I didn't know they weren't conductive. It's hard to tell what they are made out of. Ok, so maybe keep it clear to keep it from bending pins.
 
SarverSystems said:
I didn't know they weren't conductive. It's hard to tell what they are made out of. Ok, so maybe keep it clear to keep it from bending pins.
Click to expand...
Ferrites are electrically non-conductive ferrimagnetic ceramic compound materials, consisting of iron oxides such as Hematite (Fe2O3) or Magnetite (Fe3O4) plus other metal oxides.
http://en.wikipedia.org/wiki/Ferrite_(magnet)
 
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