There are amplifiers, cell phones, two coils, what is the principle?
When the coil in the loudspeaker is energized, the coil will produce a magnetic field. When the coil is in contact with the magnetic field of the magnet, the coil will vibrate, and the vibration will make a sound. It is the force acting on the conducting conductor in the magnetic field. When AC audio frequency powerWhen the current passes through the coil of the loudspeaker (voice coil), the corresponding magnetic field is generated in the coil. The magnetic field produces an interaction with the magnetic field produced by the permanent magnet on the speaker. Thus, the force causes the sound coil to come from the speakerA magnetic field with a permanent magnet vibrates with the audio current. The diaphragm of the loudspeaker is connected with the coil, so the diaphragm vibrates. The vibration produces the same sound as the original audio signal.
The speaker sound is electrostatic attraction and repulsion effects on the accumulation of static electricity, the vibration of the vibrating diaphragm, and then through the air borne sound.Mobile phone speaker is based on the principle of Faraday's law, when the current carrying conductor through a magnetic field, will be affected by a power, its direction to Fleming's left-hand rule of force and current, the magnetic field direction perpendicular to each other, the magnitude of the force and current, magnetic flux density is proportional to the length of the wire. When the voice coil enters the alternating audio current, the sound coil is subjected to an alternating driving force to generate alternating motion, which drives the paper basin to vibrate and repeatedly pushes the air to produce sound.In these speakers, in addition to electric speakers, other speakers are eliminated because of the narrow frequency range of radiated sound and small radiated power. The rest of the loudspeaker, due to the radiation frequency range up to the whole audio range, and sound power can be large (by making high power frequency loudspeaker, using the combination method of voice, the formation of the whole band burst), which has been widely used.
A loudspeaker is an electroacoustic conversion unit that converts sound, electrical signals into sounds. From the history of development, there have been various speakers, such as: Electric speakers, electromagnetic speakers (i.e. reed speakers), crystal speakers, static speakers, etc..The electric loudspeaker is alternating current through the coil principle of sound signal motion in a magnetic field, the vibration diaphragm is connected with the voice coil, which involves even cone vibration, and then through the air, will send out sound waves.An electromagnetic loudspeaker produces an alternating magnetic field by attracting a magnetic disk through alternating coils of an alternating current, causing the vibration of the diaphragm and the paper basin, and transmitting sound through the air medium.The sound of crystal speakers is caused by the electrical expansion of the crystal plate, causing the diaphragm to vibrate and propagate sound through the air mediumThe speaker sound is electrostatic attraction and repulsion effects on the accumulation of static electricity, the vibration of the vibrating diaphragm, and then through the air borne sound.
