Why is there magnets in earphones

This brings us to headphone driver design. By far, the most common headphone driver design is the dynamic moving coil. Here is a simplified cross-sectional diagram to get a better picture of the moving-coil drive before we get into how it works:. To produce the most efficient and effective magnetic field for coil movement, the magnetic structure must have its north pole to the interior of the cylindrical coil and the south pole to the exterior of the cylindrical coil.

The coil itself must have just enough room to move back and forth within a cutaway. So how do we achieve such a magnetic structure? Well, it takes one strong central ring-shaped magnet and a few pole pieces to extend the poles of the central magnet. A cross-sectional diagram is provided below:. So the main magnet in red is shaped like a ring or a thick washer. It has its south pole facing upward and north pole underneath. A thicker ring-shaped pole piece extends this south pole and provides the boundary just to the outside of the moving coil.

A disc-shaped pole piece is laid underneath the central magnet to extend the north pole. The north pole is furth extended with a cylindrical pole piece the reaches upward and provides the boundary to the inside of the moving coil. The idea is to get the opposite poles as close to the coil as possible, with the north pole to the interior and the south pole to the exterior.

This causes the greatest number of magnetic flux lines through the coil and, therefore, the greatest amount of coil movement. When an audio signal is sent to the headphones, an alternating current the audio signal passes through the coil and causes the coil to produce a magnetic field. Because the coil is already suspended in such a strong magnetic field, this current causes the coil to move.

The audio signal causes forward and backward motion due to its alternating nature. This results in the coil moving in accordance with the audio signal. Now for the fun part. The conductive coil is attached to a diaphragm. Not only does the diaphragm hold the suspended coil in place, but it moves along with the coil when an audio signal is applied.

The diaphragm pushes and pulls air and produces sound waves as it does so. Since it moves along with the coil and the coil moves relative to the audio signal, the sound waves represent the audio signal! In this design, which makes up most headphone drivers today, the magnets are essential if the driver is to produce sound.

The Sennheiser HD Pro link to check the price on Amazon is an excellent example of a pair of moving-coil dynamic headphones:. Note that two other important types of dynamic headphone drivers work with magnets and transducer energy via electromagnetic induction.

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Some myths, such as whether a magnet can damage a laptop get passed around as truth and no one really knows why. Maybe we heard it as a child in school or as we got older within our business circle Previously, old magnets could not be recycled to reuse the rare earth metals inside them, but new methods hav Jobmaster Magnets Canada Inc.

Welcome visitor, you can login or create an account. We apologize for any inconvenience. The Advantages of Neodymium Magnets in Headphones. What Are Neodymium Magnets? The Advantages of Neodymium Magnets in Headphones Neodymium magnets are lighter and smaller than other magnets, making them a perfect choice for earbuds and headphones. Tags: Neodymium Magnets Magnets in Headphones.

Like This:. If you were to listen to music with out of phase basses, you would feel less force. Because the loudspeakers in your earphones or at least Marek's contain some permanent magnets. To make a long story short, the magnetic field produced by the current is used to move the permanent magnet according to the music you're hearing. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Learn more. Why do earphone pieces repel each other when music is on? Ask Question. Asked 10 years, 11 months ago.

Active 3 years, 4 months ago. Viewed 12k times. In particular: What is in the ear piece? Why do they repel as opposed to attract? How come my ear buds don't seem to do it?