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Electret microphone is omnidirectional. This meas that it can hear from all directions. Transistor works as transducer in the heart of the electret microphone. Electret microphone Sensitivitymicrophone sensitivity is defined in datasheet as "(- 46 ± 2.0, ( 0 dB = 1V / Pa ) at 1K Hz)". Operating temperature the electret microphone is working is -20 to 60 degrees. Frequency rate is 100 - 10,000 Hz. Current depend on sound level. Maximum current is 0.5mA.
Transfer function of the Electret electret microphone is the electrical force gained on the diaphragm:
F≈(E_dc+E_ac )^2-(E_dc+E_ac )^2=4E_dc E_ac
Where
E_dc =
E_ac =
Electret microphone can be made better by improving material and size. Electret microphone is used in mobile devices and which make it
Source of charasteristics:
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