How Earphones Work
If you’ve ever wondered how earphones work, you’re not alone. Sound, which is invisible, is made up of waves called sound waves. An earphone’s sound system produces these sound waves using an electronic component called a voice coil. A thin copper piece called a voice coil is housed inside a magnet. When plugged into an electrical source, a current flows through the voice coil and into an earphone’s sound chamber. This creates an electromagnetic field and the sound you hear is a reflection of the sound.
An earphone’s piezoelectricity can make them a better choice for some purposes. For instance, the moving-coil design of a piezoelectric earphone will enable the user to hear sounds clearly and more consistently. Unlike conventional earphones, piezoelectric earphones use two opposing polarity piezoelectric thin sheets. This enables them to produce a sound at different frequencies.
Piezoelectric earphones are made of crystals sandwiched between two oppositely polar conductive materials. The mechanical energy that is generated is directly proportional to the amount of piezoelectric energy produced by the crystal. Piezoelectric crystals are typically made of quartz, though ceramics and Rochelle salts are also used. The surface treatment of the crystal is important as it affects the frequency of vibration.
Most headphones use magnets as their drivers to convert audio signals into sound waves. These magnetic devices can be small or large, a strip, a disc, or even a ball. Some earphones contain multiple magnets, including neodymium and ceramic types. These types of magnets are also known as “piezoelectric” devices, and their electrical charge is derived from a patented process.
Magnetic fields are also used to operate the driver in headphones. These drivers convert electrical audio signals into sound waves through a diaphragm. Small-sized loudspeakers have magnetic cones. Electric current changes the magnetic field, which causes the cone to move. The movement of the cone creates pressure variations in the air, which in turn form sound waves. Magnets in headphones make it possible to create a loud, clear sound with less energy and lower-pitched sound.
A loop of wire contains a permanent magnet. When an electric current passes through it, the magnet pushes air, which produces sound. These headphones are sometimes referred to as planar magnetic headphones. They have been introduced by several audio hardware manufacturers in recent years. Their use in earphones allows them to be made without suspension materials. The main difference between these headphones and other types of headphone drivers is that these products use neodymium magnets.
Moving coil headphone transducers use the same technology as moving coil loudspeakers to convert electrical energy into mechanical energy. This type of transducer relies on the Faraday’s law of electromagnetism, which states that a current flowing through a magnetic coil produces an electromotive force. The moving coil headphone transducer assembly includes a thin light diaphragm and a large coil that sits inside a magnetic channel. A powerful magnet acts as an amplifier, causing the coil to move, creating an electromagnetic field, which drives the diaphragm. The result is an audible sound, which is called a transient.
The conductive coil is connected to a diaphragm, which is in turn attached to a permanent magnetic structure. The coil is a cylindrical, tightly wound coil that is suspended in a cutaway in the permanent magnetic structure. The circular cutaway in the permanent magnetic structure must be large enough to accommodate the moving coil. Once the coil has reached the right frequency, it produces a sound in the air.
In earphones, the diaphragm is an important component that affects sound quality. There are several types of earphones with different diaphragm materials. PET diaphragms are the most common. They are cheap and easy to manufacture, but they can lose their mechanical integrity when heated. This is why PET diaphragms are usually used for small-sized headphones.
The main difference between earphones and loudspeakers is that the former are smaller and simpler in construction than the latter. The diaphragm is located at the center of the earphone, while the latter is constructed with small, open spokes. The reason for this design is to keep the headphone small and light enough to fit comfortably in the ear. It is important to note that the diaphragm is the main source of sound in these headphones.
Dynamic drivers use magnets to produce sound. They do not have coils to move the diaphragm; instead, they use a thin electrical conductor between two permanent magnets. This conductor moves towards the magnet, which causes the diaphragm to vibrate. This movement is what generates sound. Dynamic drivers have simple mechanisms and can produce high volumes with less power. They are the most popular type of earphones because they are the most cost-effective.