The magnetic core refers to a sintered magnetic metal oxide composed of various iron oxide mixtures, for example, manganese-zinc ferrite and nickel-zinc ferrite are typical magnetic core materials. Manganese-zinc ferrites are characterized by high magnetic permeability and high magnetic flux density, and at frequencies below 1MHz, they have low loss characteristics. Nickel-zinc ferrites have extremely high resistivity, low magnetic permeability of less than a few hundred, and low losses at frequencies higher than 1MHz. Ferrite cores are used in coils and transformers of various electronic devices.

Absorptive magnetic ring, also known as ferrite magnetic ring, referred to as magnetic ring, it is a commonly used anti-interference component in electronic circuits, and has an excellent suppression effect on high-frequency noise, usually using ferrite materials (Mn- Zn).

The magnetic ring has different impedance characteristics at different frequencies. Usually, the impedance is small at low frequencies. When the signal frequency increases, the impedance of the magnetic ring increases sharply.

We all know that the higher the signal frequency, the easier it is to radiate out (it is also necessary to buy a high-quality computer case to reduce electromagnetic leakage), and the usual signal lines are not shielded, so these signal lines become very A good antenna accepts all kinds of messy high-frequency signals in the surrounding environment, and these signals are superimposed on the original transmitted signal, and even change the original transmitted useful signal. Then, under the effect of the magnetic ring, the normal and useful signals can pass through very well, and the high-frequency interference signals can be suppressed very well, and the cost is low.