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	Ferrite Beads
		Ferrite beads do not have to be grounded and they cannot be detuned by external magnetic fields.
		Ferrite beads are usually quite small and as a result only one pass, or a small number of turns are possible.
		The number of turns on a single hole Ferrite bead or a toroidal core is identified by the number of times the conductor passes through the center hole.
	www.bytemark.com /products/ferbead.htm (633 words)

	AMIDON ASSOCIATES, INC.
		Ferrite beads do not have to be grounded and they cannot be detuned by external magnetic fields.
		Ferrite beads are usually quite small and as a result only one pass, or a small number of turns are possible.
		The number of turns on a single hole Ferrite bead or a toroidal core is identified by the number of times the conductor passes through the center hole.
	www.amidoncorp.com /aai_ferritesshieldingbeads.htm (691 words)

	Ferrite bead - Wikipedia, the free encyclopedia
		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 extremely effective high frequency noise suppression devices.
		Ferrite bead is similar in construction to inductor, but working in especially that area that is parasitic for general purpose inductors.
	en.wikipedia.org /wiki/Ferrite_bead (103 words)

	RFI - Tip Sheet
		An alternative approach is to use ferrite beads to reduce the amount of RF entering the equipment.
		Ferrite beads are made of the same materials as the toroid cores used in broadband transformers but are used at much higher frequencies.
		The beads, unlike a resistor, do not affect the wire at low frequencies so the audio, DC, and other low frequency components go through the wire just as though the bead were not there.
	www.antennex.com /shack/Dec99/beads.htm (2282 words)

	[No title]
		A ferrite bead is simply a hollow bead or cylinder made of ferrite, which is a semi-magnetic substance made from iron oxide (rust) alloyed with other metals.
		This is picture of a ferrite bead that is commonly attached to the video cable that is typically attached to your desktop computer and then to your monitor.
		In essence, using a ferrite bead to eliminate the RFI from a computer cable, or keeping it from disrupting the function of your TV, is similar to using one to help eliminate the RFI from your cell phone that may be disrupting the normal function of your brain.
	www.mercola.com /forms/ferrite_beads.htm (1768 words)

	Simple Ferrite Bead Absorbs Cellphone Radiation - Gizmodo
		A British professor is urging for the use of ferrite beads on wired, hands-free headsets to absorb excess radiation that may travel up the outside of the wire.
		The same sort of ferrite beads are often seen on monitor cables—it's that bulging cylinder right before the plug—and should add only pennies and a little weight to the headsets.
		While no one will cop to the idea that radiation from cellphones is harmful, if you're already going through the effort to stave off potential tumors by using a hands-free earpiece you might as well take it all the way.
	www.gizmodo.com /gadgets/peripherals/headsets/simple-ferrite-bead-absorbs-cellphone-radiation-031057.php (164 words)

	Ferrite - Applcation notes (Site not responding. Last check: 2007-10-26)
		Ferrites intended for EMI applications above 30 MHz are mixtures of iron, nickel and zinc oxides that are characterized by high volume resistivity (10@ ohm-cm) and moderate initial permeability (100 to 1500).
		Ferrites are most frequently used as two terminal circuit elements, or in groups of two terminal elements.
		In this case, each ferrite will be subject to a large net DC bias, which will result in a large reduction in the high frequency impedance of the ferrite, and a corresponding reduction in EMI suppression performance.
	www.topmagnetics.com /ferriteproperties.htm (2515 words)

	Ferrite (magnet) - Wikipedia, the free encyclopedia
		Ferrites that are used in transformer or electromagnet cores contain nickel, zinc or manganese compounds.
		Ferrite cores are used in electronic inductors, transformers, and electromagnets where the high electrical resistance of the ferrite leads to very low eddy current losses.
		Ferrite particles are also used as a component of radar-absorbing materials or coatings used in stealth aircraft and in the expensive absorption tiles lining the rooms used for electromagnetic compatibility measurements.
	en.wikipedia.org /wiki/Ferrite_(magnet) (653 words)

	Ferrite Rod Antenna - Free Antenna Modeling Software
		Consequently, the ferrite bead is useful for blocking/absorbing the higher frequency noise.
		That is not the role of the ferrite in a loop antenna.
		A ferrite loaded loop is usually much smaller than the equivalent air loop and the amount of wire is significantly less than an air-core loop.
	home.att.net /~ray.l.cross/murod_mm (2641 words)

	Ferrite Beads
		Ferrite beads come in two flavors: high-Q, resonant beads and low-Q, nonresonant beads, also called lossy, or absorptive beads.
		These beads are used to construct RF oscillators and filters and other circuits that need highly resonant circuit elements.
		From this curve, you may ascertain the efficacy of a particular ferrite bead at your frequency of interest.
	www.sigcon.com /Pubs/edn/ferritebeads.htm (654 words)

	Howstuffworks "What are the bumps at the end of computer cables?"
		A ferrite bead is simply a hollow bead or cylinder made of ferrite, which is a semi-magnetic substance made from iron oxide (rust) alloyed with other metals.
		The bead is encased in plastic -- if you cut the plastic, all that you would find inside is a fl metal cylinder.
		A ferrite bead has the property of eliminating the broadcast signals.
	computer.howstuffworks.com /question352.htm (347 words)

	[No title]
		Commercial used permanent magnetic ferrite is strontian ferrite and ferroxdure whose component are SrFe12O19 and BaFe12O19 respectively.
		Ferrite is a tool for automating text manipulation, conversion and data extraction.
		Position the ferrite bead over the silkscreen outline and insert the leads into the solder holes.
	lycos.cs.cmu.edu /info/ferrite.html (447 words)

	BBC NEWS \| Health \| Bead 'slashes mobile radiation'
		Ferrite beads are commonly used in computers to stop interference
		The beads, which often measure less than 1cm in diameter, are commonly used to stop data interference in computers.
		Dr Porter, who has looked at the use of ferrite beads, said: "Hands-free kits effectively have two currents, an intentional one that stays within the wires and an unintentional one on the outside.
	news.bbc.co.uk /2/hi/health/4203077.stm (420 words)

	KB6NU’s Ham Radio Blog » Blog Archive » Use your antenna analyzer to test ferrite-bead chokes
		Ferrite chokes are widely used to reduce or supporess RFI in electronic and electrical equipment.
		To test ferrite beads, you will need an antenna analyzer, such as the MFJ-259, and enough hookup wire–size 22 is ideal–to make 5 passes through the bead plus enough to connect the ends to the analyzer.
		If your bead was made with mix 43, the inductance will be about 40 μH. A lower reading may indicate that the ferrite is not mix 43, and it may not work properly.
	kb6nu.com /OLD303 (435 words)

	Variable inductance displacement measuring device with slidable metal sleeve and ferrite bead core - Patent 5010298
		In accordance with this embodiment, the cores incorporated within the coils A and B are beads 75 of sintered ferrite, instead of permalloy of high magnetic permeability, as shown in FIGS.
		Each of the sintered ferrite beads 75 is formed as a tube of 5 mm long and which has an outer diameter of 1.7 mm and an inner diameter of 0.7 mm as, for example, shown in FIG.
		14B, a plurality of beads 75 are inserted with a wire 76 made of phosphate bronze having an outer diameter of, for example, 0.68 mm and are then fixed to become a predetermined length by a bonding agent, thus resulting in the ferrite core 77 being produced.
	www.freepatentsonline.com /5010298.html (4934 words)

	Ferrite Filter, EMC: Consultant McCann Science
		In principle the idea is simple, a test on a single ferrite bead gives an indication of its inductance and with the resistance of the circuit, an estimate of attenuation or filtering effect is made.
		However, the configuration allowed only a small amount of space for the ferrite material, the form was a coaxial line with non-standard conductor materials and the terminations were themselves other coaxial arrangements.
		As the power was applied, the ferrite bead absorbed it, heated up and changed its characterisitics.
	www.mccannscience.com /FerriteFilter.htm (478 words)

	[No title]
		A British professor is urging for the use of ferrite beads on wired, hands-free headsets to absorb excess radiation that may travel up the outside of the wire.
		The same sort of ferrite beads are often seen on monitor cables—it's that bulging cylinder right before the plug—and should add only pennies and a little weight to the headsets.
		While no one will cop to the idea that radiation from cellphones is harmful, if you're already going through the effort to stave off potential tumors by using a hands-free earpiece you might as well take it all the way.
	www.lycos.com /info/ferrite--ferrite-beads.html (453 words)

	X1W-1 Construction: Ferrite Beads (Site not responding. Last check: 2007-10-26)
		Ferrite beads have a cylindrical shape with a hole through the middle.
		String a ferrite bead on a clipped lead from the resistors previously installed.
		Spread the leads on the bottom side of the board apart slightly to hold the bead in place.
	www.tapr.org /~n4xi/x1w-1/ferrite.html (143 words)

	Ferrite on Reducing RFI (Site not responding. Last check: 2007-10-26)
		I just built 6 bead baluns using the 73 beads with.2 inch ID - at $4.50 a dozen or 15 cents apiece in 300 quantity the price was sure right.
		Amidon also sells split beads in the 43 material with.250 and.500 ID that show decent impedance at 10 MHz though they clearly peak higher.
		The.2 id beads (FB-X-2401, where "X" is the material number) are only available in 43 and 73, while the larger and more expensive ones are only available in 43, and so are the various split cores.
	www.qth.com /ka9fox/Ferrite-on-Reducing-RFI.htm (1138 words)

	AEM Announces World's First High Reliability Ferrite Chip Bead Line
		This U.S.-produced HRB Series is the world's first ferrite chip bead designed and tested specifically to meet Space, Military and Medical requirements.
		Ferrite beads are used for electronic noise suppression.
		All HRB Series Ferrite Chip Beads are supplied with Group A and B test data.
	www.spacedaily.com /news/space-electronics-02d.html (354 words)

	Learn Electronics Lessons and Information Pages
		Ferrite composition in the form of a bead.
		Running a wire through the bead increases the inductance of the wire.
		Compound composed of iron oxide, a metallic oxide and ceramic.
	www.twysted-pair.com /dictf.htm (522 words)

	eBay - ferrite bead, Industrial Electrical Test, Desktop Laptop Accessories items on eBay.com (Site not responding. Last check: 2007-10-26)
		Ferrite Snap Split Beads Lot of 10 Black T20 T 20 T-20
		ferrite beads 28mm x 25mm diameter tube lot of 2 choke
		Ferrite Snap Bead Noise Suppression EMI Core Lot 50
	search-desc.ebay.com /search/search.dll?query=ferrite+bead&newu=1&krd=1 (489 words)

	ferrite bead,ferrite core manufacturer and ferrite bead,ferrite core supplier.
		ferrite bead,ferrite core manufacturer and ferrite bead,ferrite core supplier.
		China Ningbo Daxie Developing District Yinxin Magnetic Industry Co., Ltd. is specialized in producing, processing and developing the new technology in the field of NdFeB——the lastest products of permanent magnet, ferrite bead, ferrite core in the world.
		The standards sizes of all hard ferrite shapes mean the sizes of finished products which undergo.Sintering and grinding processes.
	www.yinxin-magnet.com /ferrite_bead.htm (177 words)

	SMT Ferrite Chip Bead Array features 4-in-1 packaging., J.W. Miller Magnetics
		The new PMA Series features four ferrite beads in a single package, which allows handling of four separate lines simultaneously, providing maximum space saving economies.
		Performance characteristics include impedance range of 30 to 1000 ohms, DC current range of 100 to 350mA, and an operating temperature range of -55 to +125°C. Terminals are solder coated for wave and reflow soldering.
		The PMA Series Ferrite Chip Bead Arrays, offered in Type L for low frequency and Type H for high frequency applications, are available in tape and reel packaging (3,000 per reel) and priced from $0.025 in production quantities.
	news.thomasnet.com /fullstory/28080 (642 words)

	Products: Ferrite Beads Overview
		Our line of SMD ferrite beads are comprised of several material types, frequency characteristics and a board range of impedance values to provide noise countermeasures for various applications from radiated noise suppression in computer or printer interfaces to mobile devices requiring lower power consumption.
		In addition, we offer a series of beads for broadband, upper MHz range, and GHz range applications.
		With an operating temperature of -25° - +85°C and the use of high loss ferrite material, the easily mounted leaded ferrite bead is available in a wide range of values and configurations to suit most applications.
	www.t-yuden.com /ferritebeads/index.cfm (171 words)

	Ferrite Bead Chokes (Site not responding. Last check: 2007-10-26)
		The number of beads varies depending upon electrical characteristics required.
		NRD Ferrite Bead Chokes exhibit substantially constant AC resistance and impedance from 10 to above 300 mc., making them extremely useful for isolating high frequency signals from low frequencies as found in power supply and audio circuits.
		The Ferrite Bead Choke is but the latest in a long series of pioneering concepts developed by NRD.
	www.cardwellcondenser.com /PAGES/nr10.html (212 words)

	Stackpole Introduces Ferrite Bead Chip Inductors (Site not responding. Last check: 2007-10-26)
		Designated the CB Series, these ferrite bead chip inductors have impedance ranges from 6 to 2700 Ohms (at tolerances of ±20% and ±25%), with rated currents of 50mA to 6A -- and DC resistances of 0.02 to 1.2 Ohms.
		The CB Series of chip ferrite beads function as a resistor or attenuator at high frequencies.
		Typically, the beads are effective in applications across a wide frequency range from 1MHz to several hundred MHz.
	www.seielect.com /news/20050900_CB.htm (354 words)

	XM Modifications for FCC Compliance - Orbitcast.com
		We heard that for XM Satellite Radio to get back into the good graces, all that was needed was the addition of a 25-cent part.
		Well, lo-and-behold, here's the first modification applied to a Roady XT in the form of a ferrite bead.
		I thought that the ferrite beads were to block the EMI and RFI that the cables produce.
	www.orbitcast.com /archives/xm-modifications-for-fcc-compliance.html (516 words)

	Find Beads, Ferrite on FindGuru, formerly ReedLink, 38737 (Site not responding. Last check: 2007-10-26)
		FindGuru, formerly ReedLink, is the premier source for locating Ferrite Beads.
		Perform a search across our extensive database of ferrite beads by selecting the product specifications you require.
		A ferrite bead is a hollow bead or cylinder used in electronic applications to eliminate crosstalk, prevent self-oscillation, and to suppress electromagnetic and radio frequency interference.
	www.findguru.com /ProductHome~ProductId~38737~Ph~-1.html (62 words)

	Chip Ferrite Impedors, Bead - Search for Chip Ferrite Impedors, Bead Manufacturers and Suppliers from Taiwan, China and ...
		Multilayer chip bead: suitable for flow and reflow soldering, Impendance over a broad frequency range, Standard type used to suppress lower-frequency, lower current signals.Multilayer chip inductors: Cost effective, Suitable for small portable equipment, Supports operating frequency bands up to 6GHz with nominal inductance values from 1.nH to 470nH.
		The Ferrites Chip EMI suppresser is a ferrite bead for use to prevent.
		The EMI interference noise requirement of particular circuit from 7 ohms to 1,000 ohms impedance at 100 MHz.
	www.allproducts.com /search/show_cate.cgi?q=pE01101107.shtml (732 words)

	ferrite bead,ferrite beads manufacturer and ferrite bead,ferrite beads supplier--China Ningbo Ketian Magnet Co,.Ltd
		We are professional ferrite, ferrite bead, ferrite core, ferrite magnet, ferrite material manufacturer and factory in China.
		We can produce blow ferrite bead, ferrite beads according to your requirements.
		ferrite, ferrite bead, ferrite core, ferrite magnet, bonded ferrite magnets, ferrite material, dry pressing ferrite magnet compound, dry pressing ferrite magnets, Ferrite Magnets
	www.kt-magnet.com /ferrite_bead.htm (241 words)

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