A piece of plastic that has a static charge of electricity built into it. It is used inside of a condenser microphone so that battery power doesn't have to be used to charge the condenser, or capacitor.
Indicates a microphone capsule that operates by having an electrically charged diaphragm or back-plate (back-electret). In almost all case a back-electret capsule will give superior performance to that of the simpler and cheaper charged-diaphragm type. Go to Index. Go to Index.
Filter media to which an electrostatic charge is applied during its formation.
A type of microphone design, similar to condenser. Basically, there is a permanently charged plate in the mic element. As the diaphragm moves in response to sound pressure, it creates a changing capacitance with the plate. The big advantage to using electret (also called back-electret, or occasionally prepolarized condenser) technology is that it does not require an external polarizing voltage (battery or phantom power). In some cases, the microphone includes an impedance changing preamp that requires battery or phantom power, but the electret element itself does not require voltage. Electret mics can lose their charge in high humidity and high temperature environments, so some care should be used in storing and using them. If the electret loses charge, the mic's sensitivity will suffer, resulting in an reduced signal to noise ratio.
a body with a permanent polarization, analogous to a magnet which has a permanent magnetization
a dielectric material that has been permanently e
a dielectric material that has been permanently elec
a dielectric material that has been permanently electricall
a dielectric material that has been permanently electrically charged or polarised
a dielectric material that has been permanently electrically char
a dielectric material that has been permanently electrically c
a manufactured thing which is analogous to a permanent magnet
an analog of a permanent magnet
a sheet or slab of waxy dielectric material that supports an electric field, much as a permanent magnet carries a magnetic field
a trapped charge that occurs in plastics and other insulating materials during the forming process
A type of microphone. Typically has a higher output than standard dynamic microphones.
A material (such as Teflon) that can retain a permanent electric charge.
A non-conductive polymeric material which can maintain a long-lived electrostatic charge. Polypropylene electret filtration fabrics conveniently combine the mechanical removal of particles with an electrostatic field, which materially increases the filtration efficiency.
Electret (formed of elektr- from "electricity" and -et from "magnet") is a dielectric material that has a quasi-permanent electric charge or dipole polarisation. An electret generates internal and external electric fields, and is the electrostatic equivalent of a permanent magnet. Oliver Heaviside coined this term in 1885.
