Fair-Rite Ni-Zn/Mn-Zn Ferrite Cores 2643626502magnet ring

EVERWORTH represents the following brands:

1.Ferrite Core: Ferroxcube, MAGNETICS,DMEGC,EPCOS/TDK,ARNOLD,Laird,ACME,Fair-Rite,CSC；

2. Thin film capacitors:FEIDA, Japan OKAYA (discharge tube, filter, surge protector, X2 capacitor);

3. Bobbin: FERROXCUBE,SHULIN

4. Customize high-frequency and low-frequency transformers, wound inductors, etc;

Long term supply of Fair-Rite full range products

On video cables and other wires, it can effectively shield EMI/RFI interference, isolate or filter out high-frequency noise pulse interference from power connection wires entering equipment circuits. If used on audio and video electrical power cables, it can further improve audio and video quality, undoubtedly making it a choice for audio enthusiasts. Used on various cables such as audio and video cables, it increases the purity of the audio system and reduces signal line interference from power line noise

Magnetic ring

The electromagnetic waves emitted and leaked by electronic devices not only seriously interfere with the normal operation of other electronic devices, leading to device dysfunction, transmission errors, but also pose a threat to human health and safety, with great harm. Therefore, reducing electromagnetic interference (EMI) in electronic devices has become a necessary consideration.

Noise absorbing magnetic ring, also known as ferrite magnetic ring, abbreviated as magnetic ring. It is a commonly used anti-interference component in electronic circuits, which has a good suppression effect on high-frequency noise. It is generally made of ferrite material (Mn-Zn,Ni-Zn).

EMI magnetic rings have different impedance characteristics at different frequencies. Generally, the impedance is very small at low frequencies, and the impedance exhibited by the magnetic ring increases sharply as the signal frequency increases.

As we all know, the higher the signal frequency, the easier it is to radiate (to buy a high-quality computer case, it is also necessary to reduce electromagnetic leakage). However, most signal lines do not have shielding layers, so these signal lines become good antennas to receive various chaotic high-frequency signals in the surrounding environment. These signals are superimposed on the originally transmitted signal and may even change the useful signal originally transmitted. Under the action of the magnetic ring, normal and useful signals can pass through well, while high-frequency interference signals can be effectively suppressed, and the cost is low.

So it's not surprising that people see plastic lump shaped integrated magnetic rings on monitor signal cables, USB connection cables, and even keyboards and mice.

Selection of turns for magnetic rings

Passing the entire cable through a ferrite magnetic ring forms a common mode choke, and the cable can also be wound around the magnetic ring a few times as needed. The more turns there are, the better the suppression effect on interference at lower frequencies, while the suppression effect on noise at higher frequencies is weaker. In practical engineering, the number of turns of the magnetic ring should be adjusted according to the frequency characteristics of the interference current. Usually, when the frequency band of the interference signal is wide, two magnetic rings can be placed on the cable, each with a different number of turns, which can simultaneously suppress high-frequency interference and low-frequency interference. From the mechanism of the common mode choke coil, the larger its impedance, the more obvious its interference suppression effect. The impedance of the common mode choke coil comes from the common mode inductance Lcm=jwLcm. It is not difficult to see from the formula that for a certain frequency of noise, the larger the inductance of the magnetic ring, the better. But the actual situation is not like that, because there are parasitic capacitors on the actual magnetic ring, which exist in parallel with the inductor. When encountering high-frequency interference signals, the capacitance impedance of the capacitor is small, which short circuits the inductance of the magnetic ring, thereby rendering the common mode choke ineffective