What are the characteristics of Hollow inductor and iron core inductor?

Hollow inductor is more suitable for the occasion with wider frequency, and solid reactance has serious frequency tendency; also That is to say, the hollow inductive reactance allows most audio or audio frequencies to pass, while the solid inductive reactance is selective and only allows a part to pass.

What are the advantages of aluminum t profile?

It is generally made of aluminum and aluminum alloy by hot extrusion or rolling, so it is called aluminum t profile. If the steel is made by rolling, it is called steel aluminum profile.

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