electret การใช้

• So please also see electret microphone and its external links.
• For example, they are used in electret microphones and in copy machines.
• Electret materials have found commercial and technical interest.
• Nearly all cell-phone, computer, PDA and headset microphones are electret types.
• It is often used for powering electret microphones, which will not function without power.
• Excess charge within an electret decays exponentially.
• TSC is useful for electret research.
• :Mostlikely electret mics are used.
• More sensitive than dynamic mikes, these electret condenser microphones promise to capture the subtle nuances of voice.
• Modern electret microphones use PTFE plastic, either in film or solute form, to form the electret.
• Modern electret microphones use PTFE plastic, either in film or solute form, to form the electret.
• Electret ears would be pretty cool . talk ) 23 : 02, 8 August 2011 ( UTC)
• First patent on foil electret microphone by G . M . Sessler and J . E . West ( pages 1 to 3)
• Standard handset receivers functions normally when their polarity is reversed, but the electret microphone transmitter used in most modern handsets may not.
• An electret microphone is a type of condenser microphone, which eliminates the need for a power supply by using a permanently charged material.
• Electret microphones and condenser microphones employ electrostatics as the sound wave strikes the microphone's diaphragm, it moves and induces a voltage change.
• The polar molecules of the dielectric align themselves to the direction of the electrostatic field, producing a dipole electret with a permanent electrostatic'bias '.
• Cellular space charge electrets with internal bipolar charges at the voids provide a new class of electret materials, that mimic ferroelectrics, hence they are known as ferroelectrets.
• Some other sensitive designs measure the current generated by the flow of a non-corrosive ionic fluid through an electret sponge or a conductive fluid through a magnetic field.
• Can someone suggest a battery-powered circuit for amplifying the output of an electret mike to drive a headphone ( the type commonly used for portable media players )?