Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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RE: Anti EMI tape from AliExpress

Posted by Tuckers (M) on January 16, 2023 at 16:16:32

In Reply to: RE: Anti EMI tape from AliExpress posted by CG on December 17, 2022 at 13:40:55:

My Opinion:

There is EME (electromagnetic energy) generated by the cable itself. In some designs the cable is shielded and connected to ground at the entry plug. This theoretically drains the extraneous energy being produced by the cable itself and also from any outside EMI that it encounters.

Foil like this is reflective, not absorptive. Each connection to the plug and between the metals in the plug (whether soldered or clamped) also generate more EME. When you wrap the plug in shielding, unless it is grounded, it will simply reflect that EME (now EMI) back into the line. It may also repel outside EMI, but the amount internally is likely greater.

Will you hear a difference? Probably. But is it reducing EMI in your circuit? Probably not.

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