Electret and Condenser Microphones
Learn about the differences between electret and condenser microphones, how they work, their applications, and the role of electrets in microphone construction. Electrets are dielectrics with permanent electric dipole moments used in various microphone types for different purposes.
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Presentation Transcript
Condenser Microphones Similar to electret microphones Uses charged capacitor to generate electric signal As diaphragm vibrates, capacitance changes resulting in electric signal Internal battery is needed to polarize the capacitor
Electret Microphone Uses permanently charged electret material Electret and back plate form capacitor No polarizing voltage needed
Electrets An electret is a dielectric with a permanent electric dipole moment. Produces electrostatic field Made from synthetic polymers Created by melting material, then cooling it in the presence of a strong electric field
Types Diaphragm Electret material is used as the diaphragm of the microphone. Common and low quality Back electret Electret film applied to back plate, with a diaphragm made with uncharged material Front electret Electret film applied to front cover, metalized diaphragm creates the capacitor
Applications Cell phones Computers Hearing aids Megaphones
