Magnetic beads composed of oxygen magnets, inductors from the core and coil composition, the magnetic beads to the AC signal into heat, the common mode choke coil to store the exchange, the slow release.

Magnetic beads on the high-frequency signals have a greater role in hindering the general specifications of 100 Europe / 100mMHZ, which at low frequencies when the resistance is much smaller than the inductor. Inductive equivalent resistance can be Z = 2X3.14xf to obtain.

Ferrite Bead (Ferrite Bead) is the application of rapid development of an anti-jamming components, cheap, easy to use, filter out high-frequency noise effect is remarkable.

In the circuit as long as the wire through it can be (I use are like ordinary resistance appearance, the wire has been through and glued, there are surface mount form, but rarely seen sold). When the current through the wire, the ferrite on the low-frequency current is almost no resistance, while the higher frequency of the current will have a greater role in attenuation. High-frequency current in which the form of heat dissipation, the equivalent circuit for an inductor and a resistor in series, the value of the two components are proportional to the length of the beads.

Many types of beads, common mode choke manufacturers should provide technical indicators, in particular the relationship between the impedance of the bead and frequency curve.

Some magnetic beads have multiple holes, through the wire can increase the component impedance (through the number of times the number of beads), but the increase in high frequency noise suppression can not be as much as expected, but with multi-series Several magnetic beads approach will be better.

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