Found in some record player cartridges. A series of coils move in relation to a fixed magnet to create an electrical signal that can be sent to an amplifier. The movement of the coil is relative to the movement of the stylus in the record's surface.
A type of loudspeaker construction in which a voice coil connected to a speaker cone of paper-like material, interacts within the range of a magnetic field. It is also a standard used in phonograph cartridges in which the reverse principle is applied: the stylus (needle) is directly coupled to a coil which is placed within a magnetic field. The resultant voltage generated by the coil is then fed to the preamplifier in its electronic form. Can also apply to microphone construction, and refer to what we call a dynamic microphone capsule.
Cartridges with a stylus connected to coils which move in relation to fixed magnets, creating electrical signals. Lower output than moving magnet
A specific type of dynamic (as opposed to condenser) microphone design. Moving coil microphones are among the most commonly used in music and sound production. The ubiquitous SM-58 and SM-57 mics are examples of moving coil design. These mics work on very simple principles. In fact they work just like a speaker in reverse. The diaphragm has a coil of wire attached to its base. This coil is inserted into a magnetic gap. When changes in air pressure cause the diaphragm to vibrate in and out of the magnetic gap it generates an alternating current in the wire that represents the signal. Moving Coil is also one method used in making phonograph cartridges. Moving coil designs were all but replaced by moving magnet designs (same principle, but the magnet moves instead) in the 1970's. Moving coil phonograph cartridges have very low output (requiring a different preamp) and are very expensive compared to their moving magnet counterparts, but there are some sonic advantages to them including lower distortion and better frequency response.
Operating principle of moving coil loudspeakers and pickup cartridges. Wound around a permanent magnet a loudspeaker's voice coil is fed electrical input signals. The resulting electro-motive force induced in the coil forces the loudspeaker diaphragm to move. In the cartridge, the mechanical movement of the pickup stylus translated to the moving coils located next to a fixed permanent magnet causes the production of an analogous electrical signal.
A type of turntable cartridge. Transfers the physical movement of the stylus into electrical energy via coils that move.
