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9406-18 9406-18 18381 API Delevan Inc. FIXED IND 3.3UH 455MA 1.05OHM TH Radial, Horizontal, 4 Leads
9406-04 9406-04 12209 API Delevan Inc. FIXED IND 220NH 1.97A 56 MOHM TH Radial, Horizontal, 4 Leads
9406-28 9406-28 13721 API Delevan Inc. FIXED IND 22UH 278MA 2.8 OHM TH Radial, Horizontal, 4 Leads
9406-14 9406-14 7696 API Delevan Inc. FIXED IND 1.5UH 590MA 620MOHM TH Radial, Horizontal, 4 Leads
9406-20 9406-20 32633 API Delevan Inc. FIXED IND 4.7UH 435MA 1.15OHM TH Radial, Horizontal, 4 Leads
9406-26 9406-26 7848 API Delevan Inc. FIXED IND 15UH 305MA 2.35 OHM TH Radial, Horizontal, 4 Leads
614BN-9220Z=P3 614BN-9220Z=P3 22639 Toko America Inc. ADJUSTABLE INDUCTOR 22UH SMD Nonstandard
E558HN-100099=P3 E558HN-100099=P3 18327 Toko America Inc. ADJUSTABLE INDUCTOR 73NH SMD Nonstandard
E526HNA-100300 E526HNA-100300 17769 Toko America Inc. ADJUSTABLE INDUCTOR 240NH TH Radial
E540SN-08001 E540SN-08001 37838 Toko America Inc. ADJUSTABLE INDUCTOR THROUGH HOLE Radial
N1342DEA-0008BQE=P3 N1342DEA-0008BQE=P3 30329 Murata Electronics ADJUSTABLE INDUCTOR 2.5MH SMD Nonstandard
#A1313AN-0001GGH=P3 #A1313AN-0001GGH=P3 7500 Murata Electronics ADJUSTABLE INDUCTOR 50NH SMD Nonstandard
JLC05E088TRVSM JLC05E088TRVSM 23209 Knowles Johanson Manufacturing ADJUSTABLE INDUCTOR 74NH SMD Radial, Vertical Cylinder
294SN-T1013Z 294SN-T1013Z 31271 Toko America Inc. ADJUSTABLE INDUCTOR 470NH TH Radial, Horizontal, 4 Leads
A119ANS-T1038Z A119ANS-T1038Z 25703 Toko America Inc. ADJUSTABLE INDUCTOR 27UH TH Radial, Can
E526HN-100109 E526HN-100109 17520 Toko America Inc. ADJUSTABLE INDUCTOR 530NH TH Radial
E540SNA-15002 E540SNA-15002 24420 Toko America Inc. ADJUSTABLE INDUCTOR 422NH TH Radial
294SN-T1014Z 294SN-T1014Z 18281 Toko America Inc. ADJUSTABLE INDUCTOR 680NH TH Radial, Horizontal, 4 Leads
#292KNAS-T1028Z #292KNAS-T1028Z 30013 Toko America Inc. ADJUSTABLE INDUCTOR 100NH TH Radial
292SNS-T1366Z 292SNS-T1366Z 25849 Toko America Inc. ADJUSTABLE INDUCTOR 100NH TH Radial

Adjustable Inductors

An adjustable inductor is a passive component that can adjust the inductance value mechanically or electrically. Its core structure usually includes magnetic materials (such as ferrite cores) and movable adjustment devices. By changing the position of the core or the spacing between the coils, the inductance value can be dynamically adjusted. It is widely used in high-frequency circuits, power systems, and electronic equipment.

 

1. How do Adjustable Inductors Work?‌

1) Mechanically Adjustable Type

A ferrite core with a threaded structure is usually used. The magnetic resistance of the magnetic circuit is changed by rotating the core position inside the transformer, thereby achieving continuous adjustment of the inductance value. For example, the oscillation coil of a semiconductor radio adjusts the coupling distance between the coil and the core by rotating the magnetic cap.

 

2) ‌Magnetic Saturation Adjustment Type‌

The inductance is adjusted by changing the magnetic saturation state of the core material. For example, a linear coil uses the relative position of the permanent magnet and the coil to adjust the magnetic saturation characteristics to achieve nonlinear inductance compensation.

 

3) ‌Filling Medium Adjustment Type‌

Some designs use synthetic resin and other materials as core carriers, combined with surface roughening treatment to enhance mechanical fixing performance and ensure adjustment stability.

 

2. What are Adjustable Inductors Used for?

High-Frequency Circuit‌: used in the local oscillator circuit of radio equipment, frequency tuning is achieved by adjusting the inductance value and capacitance in real-time.

 

‌Power System‌: used as an inductor reactor to dynamically adjust the reactive power of the power grid and suppress harmonic interference.

‌Display Device‌: in the line scanning circuit of traditional TV sets, the linear distortion of the image is compensated by adjusting the magnetic core.

‌Resonant Circuit‌: combined with capacitors to form an LC filter circuit, filter specific frequency signals, and suppress noise.

 

3. What are the Technical Characteristics of Adjustable Inductors?

‌Adjustment Range‌: depends on the magnetic core material (such as ferrite and amorphous alloy) and mechanical structure design, some models can achieve several times the inductance change.

‌Frequency Response‌: in high-frequency applications, the influence of core loss and distributed capacitance on Q value needs to be considered, and low-loss magnetic core materials are usually selected.

‌Reliability Design‌: the precision adjustment mechanism needs to have dustproof and vibration-resistant characteristics, and industrial-grade products often use fully sealed packaging.

 

4. Selection Points for Adjustable Inductors

‌Current Capacity‌: the saturation current index needs to be evaluated to avoid a sudden drop in inductance due to core saturation.

‌Temperature Stability‌: The temperature coefficient of ferrite material directly affects the long-term stability of the inductance value.

‌Packaging Form‌: It is divided into plug-in type, SMD type and modular packaging to meet the needs of different installation scenarios.

 

5. Adjustable Inductors FAQs

1) ‌What is the difference between adjustable inductors and fixed inductors? ‌

‌Flexibility‌: Adjustable inductors support real-time adjustment to meet dynamic circuit requirements, while fixed inductance values are statically set;

‌Structural Complexity‌: Adjustable devices contain additional adjustment components and are usually more expensive.

 

2) ‌What issues should be paid attention to when using adjustable inductors? ‌

‌Mechanical Stability‌: Frequent adjustment may cause core wear or poor contact;

‌Temperature Influence‌: High temperature may change the magnetic permeability of the core material, and wide temperature specifications need to be selected;

‌Installation Method‌: Avoid external force vibration to cause inductance value drift.