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To: maceng2 who wrote (37697)	8/13/2002 8:50:46 PM
From: LindyBill	Respond to of 281500

pretty easy solution for everyone The things I end up learning! Just googled this. Looks like it could get pretty expensive. A Faraday shield is a type of electrostatic primary-to-secondary shield that's commonly employed in transformers. The shield is usually one turn of thin copper foil that encircles the core and is attached to system ground. It prevents high-frequency current from coupling into the secondary windings. When left unshielded, this high-frequency current will more than likely find its way into the entire system by means of interwinding capacitance. The weight added by a Faraday shield is typically negligible. In low-power applications, the need for the isolation provided by a Faraday shield can be fulfilled with a split-bobbin transformer. In extreme cases, one of several types of magnetic shielding can be applied. The shielding usually consists of an enclosure that surrounds the transformer, captures stray flux (radiation), and sends it to a solid system ground. It can be supplemented by another outer magnetic shield. This technique often is quite effective, but it's also expensive because the interior enclosures are made from high-nickel magnetic alloys and the exterior shields from mild steel. Together, they add considerable weight and complexity to the design. However, when the highest level of EMI protection is required, the magnetic enclosure is the first choice.http://www.signaltransformer.com/signal/techlib/caging2.cfm