Single layer coil
The single-layer coil is wound on the paper cylinder or bakelite frame with insulated wires one by one. Such as a transistor radio medium wave antenna coil.
Ferrite core and iron powder core coil
The inductance of the coil is related to the presence or absence of a magnetic core. Inserting a ferrite core into the air core coil can increase the inductance and improve the quality factor of the coil.
Copper core coil
Copper core coil is widely used in ultra short wave range. It is convenient and durable to change the inductance by rotating the position of copper core in the coil.
The color code inductance coil is a high-frequency inductance coil, which is made by winding some enameled wires on the magnetic core and then sealing them with epoxy resin or plastic. Its working frequency is 10kHz to 200MHz, and the inductance is generally between 0.1uh and 3300uh. The color code inductor is an inductor with a fixed inductance, and its inductance is marked by a color ring like the resistance. The unit is uh.
Choke coil
The coil that restricts the passage of alternating current is called choke coil, which is divided into high-frequency choke coil and low-frequency choke coil.
deflecting coil
The deflection coil is the load of the output stage of the TV scanning circuit. The deflection coil requires high deflection sensitivity, uniform magnetic field, high Q value, small volume and low price.
Air core inductance
In order to obtain a larger inductance value, air core inductors often need to be wound with more enameled wires. In order to reduce the influence of the line resistance of the inductors on the DC current, enameled wires with a larger wire diameter should be used. However, in some products with small volume, it is not practical to use heavy and large air core inductors, which not only increases the cost, but also limits the volume of the product. In order to improve the inductance value and maintain a light weight, we can insert a magnetic core and an iron core into the air core inductor to improve the self inductance of the inductor, thereby improving the inductance value. At present, in the computer, most of them are magnetic cores.
