4908 Inductors, Coils, Chokes

Series:	4900
Packaging:	Bulk
Part Status:	Obsolete
Inductance:	339nH
Tolerance:	--
Q @ Freq:	89 @ 45MHz
Mounting Type:	Through Hole
Package / Case:	Radial
Size / Dimension:	0.400" L x 0.400" W (10.16mm x 10.16mm)
Height:	0.562" (14.27mm)

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Introduction to Adjustable Inductors

An adjustable inductor, also known as an adjustable coil, is a device used to increase or decrease the inductance of a circuit. Inductors are used in circuits to store and regulate the flow of electric current. Adjustable inductors can be used to fine-tune electrical circuits in applications where variability or precision is required.

Usage of Adjustable Inductors

Adjustable inductors are used in a variety of settings, including radio, television, and amplifier circuits; capacitive and inductive output filters; RF components; and other electronic equipment. They can also be used in combination with other components, such as capacitors, resistors, and diodes, to create unique and effective circuits.

Types of Adjustable Inductors

There are several types of adjustable inductors. The most common type is the variable inductor, which is used to adjust the inductance of a circuit. This type of inductor consists of a set of closely wound coils, with each coil having a different number of turns. By adjusting the number of turns in each coil, the user can change the inductance of the entire circuit.Another type of adjustable inductor is the tapped inductor, which consists of two or more coils of different inductance. When the user turns a switch or knob, the inductance of the tapped inductor is changed. This type of inductor is often used in circuits where two different inductance values are needed.For applications requiring precision control of inductance, there is the adjustable ferrite core inductor. This type of inductor uses a ferrite core, which is a device containing a magnetic material enclosed by a plastic case. By setting the current on the ferrite core, the user can adjust the inductance of the circuit.Finally, for applications requiring very low inductance values, an adjustable air core inductor can be used. This inductor consists of a wire wound on an air core. By increasing or decreasing the diameter of the wire, the user can change the inductance of the circuit.

4908 Application Field and Working Principle

The 4908 adjustable inductor is an air core inductor designed for precision control of electrical circuits. It is a three-pin device that can be used in applications such as RF and power supply circuits.The working principle of the 4908 adjustable inductor is based on adjustment of the air gap between the wires. By adjusting the air gap, the inductance value can be changed over a wide range. Since the inductance of the device can be adjusted with precision, it is ideal for circuits requiring exact control.The 4908 adjustable inductor is commonly used in radio, television, and amplifier circuits, as well as in capacitive and inductive output filters, RF components, and other electronic equipment.

Conclusion

Adjustable inductors are an important component in various types of circuits. From variable inductors to tapped inductors and ferrite core and air core types, there is a type of adjustable inductor suitable for virtually any application. The 4908 adjustable inductor is a three-pin device designed for precise control of electrical circuits, and is commonly used in radio, television, amplifier, capacitive and inductive output filters, and other electronic equipment.

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