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A ferrite bead – also called a ferrite block, ferrite core, ferrite ring, EMI filter, or ferrite choke [1] [2] – is a type of choke that suppresses high-frequency electronic noise in electronic circuits. Ferrite beads employ high-frequency current dissipation in a ferrite ceramic to build high-frequency noise suppression devices.
Chokes for even higher frequencies have non-magnetic cores and low inductance. A modern form of choke used for eliminating digital RF noise from lines is the ferrite bead, a cylindrical or torus-shaped core of ferrite slipped over a wire. These are often seen on computer cables.
The short terms "ferrite rod" or "loop-stick" sometimes refer to the coil-plus-ferrite combination that takes the place of both an external antenna and the radio's first tuned circuit or just the ferrite core itself (the cylindrical rod or flat ferrite slab). These broadcast ferrite rod aerials nearly always have a permeability of 125. [8]
Small toroidal inductors with ferrite core Traditional transformers wound on rectangular-shaped cores. Interior of a linear power supply with toroidal mains transformer. Toroidal inductors and transformers are inductors and transformers which use magnetic cores with a toroidal (ring or donut) shape.
An MF or HF radio choke for tenths of an ampere, and a ferrite bead VHF choke for several amperes. A choke is an inductor designed specifically for blocking high-frequency alternating current (AC) in an electrical circuit, while allowing DC or low-frequency signals to pass. Because the inductor restricts or "chokes" the changes in current, this ...
Various ferrite cores used to make small transformers and inductors A ferrite AM loopstick antenna in a portable radio, consisting of a wire wound around a ferrite core A variety of small ferrite core inductors and transformers. Ferrites that are used in transformer or electromagnetic cores contain nickel, zinc, and/or manganese [20] compounds ...
Ferrite sheath current filters cannot effectively attenuate ground loop noise. Cables for connection of computer peripherals often have a ferrite bead. The cable can be used to increase the inductance also repeatedly passed through a ferrite core. Ferrite sheath current filters can only work effectively if a common-mode signal can flow on a line.
These form a common-mode choke which inhibits unbalanced current flow, without affecting the differential signal. Coaxial cables used at radio frequencies may be wound several times through a ferrite core to add a useful amount of common-mode inductance. This limits the flow of unwanted high-frequency common-mode current along the cable shield.