Ferrite bead

Ferrite bead

A ferrite bead is a passive electric component used to suppress high frequency noise in electronic circuits. Ferrite beads employ the mechanism of high dissipation of high frequency currents in a ferrite to build high frequency noise suppression devices. Ferrite beads may also be called ferrite cores, ferrite rings, ferrite EMI filters, or mistakenly as ferr"ous" beads.Fact|date=October 2008

Overview

Ferrite beads are similar to inductors in some ways but work especially in an area that is parasitic for general purpose inductors. They essentially act as a high impedance, or "resistor" to high frequency EMI/RFI electronic noise. The absorbed energy is converted to heat and dissipated by the ferrite, but only in extreme cases will the heat be noticeable.

Ferrite beads are one of the simplest and least expensive types of interference filters to install on preexisting electronic cabling. For a simple ferrite ring, the wire is simply wrapped around the core through the center typically 5 or 7 times. Clamp-on cores are also available, which can be attached without wrapping the wire at all.

ee also

* balun
* Choke (electronics)
* Electromagnetic interference
* Ferrite (magnet)
* Ferrite (iron)
* Magnetic core
* Toroidal inductors and transformers
* Unintentional radiator

External links

* [http://www.lightandmatter.com/html_books/0sn/ch11/ch11.html An explanation of the physics behind ferrite beads]
* [http://computer.howstuffworks.com/question352.htm What are the bumps at the end of computer cables?]
* [http://www.murata.com/emc/knowhow/pdfs/te04ea-1/23to25e.pdf Understanding Ferrite Bead Inductors] , by Murata Manufacturing
* [http://www.fair-rite.com/newfair/pdf/CUP%20Paper.pdf How to use ferrites for EMI suppression] by Fair-Rite
* [http://revision3.com/tzdaily/2007-12-26ferrite Tekzilla Daily Episode 13] , Explanation on Short Podcast


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