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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: Assistance please with proper use of TI Shield posted by cdc on March 1, 2007 at 18:49:55:
I should have mentioned in my other post In my world chassis is always tied to earth but never tied to system ground or AC return inside the sound system. AC return and Earth should be tied at the box.Ideas? OK you asked for it. heh heh
To be succesful in designing a useable sheild you must base system layout/configuration with the end goal of assuring that effects you hold dear are maximized and effects you despise are minimized.
For example you could wrap power transformers in some spacer/insulator/non conductor of electric or magnetic fields type material to gap the shield wrapping away from the signal such that there is less of this problematic coupling between shield material and the power signal. Of course the other side of this is that circuits on the outside of the shielding must also be protected from coupling to the shield material as well. From the transformer example this means that you must also consider the protection of the circuitry the transformer is there to power in the first place from the shield material as well since it too may couple to the shield material to an undesireable end. How do they say? Don't throw the baby out with the bathwater? Physical seperation by distance between potential victim signals and shield material is good.
I think it is also important to note the idea of a Farraday cage when considering shielding layout. This is your ultimate goal in order to maximize the benefits of shields. Large apertures and any deviation from the perfect goal of a perfectly enclosing cage with only electromagnetically *small* or smaller apertures will reduce the effectiveness of the resulting attempt at shielding.
What the other poster was saying about good high frequency grounding via physically larger conductors is right on. My understanding is: because of skin affect the conductivity of a conductor is related to frequency of the signal and shape of conductor. A way to guarantee a usable low impedance ground connection is to have conductors that have large dimension/s. Low impedance Erths are important to the effectiveness of earth grounds just as they are in other grounding aspects such as circuit board ground planes for example.
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Follow Ups
- Re: Assistance please with proper use of TI Shield - Ugly 12:36:01 03/02/07 (0)
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