Difference between hollow inductors and solid inductors

       Do you know the difference between a hollow inductor and a solid inductor? In the case of the same number of turns and volume, the "inductive reactance" value of the hollow inductor is much lower than the solid inductor; this has led to the hollow inductor being more suitable for a wide range of frequencies. The impedance allows most audio or audio to pass, while the solid sense impedance is only selective, allowing only a portion to pass. Generally speaking, the use of these two types of inductive reactance is mainly because the needs of audio and audio are taken into consideration to achieve the purpose of frequency division output.

hollow inductor
        The inductance of the air-core coil is very small, and it is only suitable for use in high-frequency and ultra-high-frequency circuits. If the number of windings is small, and the diameter of the wire is thick, the winding can be performed without a skeleton. When the operating frequency is greater than 100MHz, generally in order to reduce the skin effect, a single thick silver-plated copper wire should be used. Both the skeleton and the skeleton have good characteristics, a high Q value and high stability. Single-layer dense-wound hollow coils are suitable for short-wave and medium-wave circuits, and generally use a skeleton.