Uxcell 17.5x9.5x12.7mm Ferrite Toroid Core Inductor Coil Ring, Black 30 Pack

Toroidal cores are passive electronic components consisting of a circular ring or donut-shaped magnetic core of ferromagnetic ferrite around which wire is wound.

Advantage
Ferrite cores are dense, homogeneous ceramic structures made by mixing iron oxide (NiZnFe2O4) with oxides or carbonates of nickel, zinc. Have very high permeability and low losses, can work at high frequencies.

Instruction
Used to suppress electromagnetic emissions by blocking low-frequency noise and absorbing high-frequency noise, avoiding interference. Widely used in EMI/RFI filters, audio transformers, communications, control circuit equipment, LED lighting, automotive electronics, industrial control, etc.

NOTE
The more the number of coiled cables, the better the effect of suppressing interference with lower frequencies, the weaker the effect of suppressing noise with higher frequencies.