Mobile Cell Phone Repairing | Mobile Phone Repair Guide, Help, Tips, Pictures, Videos, Hardware, Software Solution

SMD Coil – Surface Mount Chip Coil Guide

SMD Chip Coil is made by twisting any conductor wire on a bad conductor base. The base on which the coil is formed is called core. When these coils do not have any base, they are called air core coil. Coil is also known as conductor. A coil always resists any variation in flow of current. If any variable supply is given to any coil, the voltage of opposite polarity is generated in the coil. This property of a coil is known as inductance. Hence, a coil is also called inductor.

Types of SMD Coil or Inductor

There are many types of coil but surface mount coils are mostly used in mobile phones. These are tiny chip inductors directly soldered on the PCB track on the mobile cell phone. This type of inductor is called general purpose inductor. This is used for sharp frequency response for high quality factor. These inductors are made by spiraling wire on ferrite core with magnetic shield and surface mounting terminals are created on both ends after mounting it in a small hard package. These terminals are nickel coated for easy and better soldering on PCB Track. Nickel coating ensures reliable soldering.


What is the Graphical Symbol of Coil?

The Graphical Symbol of Coil is:

Coil Symbol

Coil Symbol

Which character or alphabet indicates a Coil?

Coil is indicated by the alphabet L

What is the Work of a Coil?

The main function of a Coil is to STOP AC and PASS DC.

What is the Unit of Coil?

SMD Coil

SMD Coil

The Unit of Coil is Hanery.

Effect of DC on Coil

A Coil passes DC Current like an ordinary wire. Magnetic properties are generated in the coil on getting DC. The power in the coil attracts iron particles.

Effect of AC on Coil

When AC current or Alternate Current or Variable Electric Current is given to a coil, a variable magnetic electric field is generated in the coil. AC voltage in opposite directions is generated due to this variable magnetic field which resists the AC volt.

How to Check Coil?

Place the selector knob of the Multimeter on Diode Sign. Now place the probes on both the terminals of the coil. If a beep sound is produced and the display reads close to 000, it means that the coil is OK. If the display shows 1, it means the coil is open.


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By Santosh Das | Mobile Cell Phone Repairing

1 Comment

  • By valte, November 19, 2013 @ 6:05 pm

    how to test unprinted resistor

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