Elecret microphone connection

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Elecret microphone connection

Elecret microphones have a small electret melement and FET amplifier built to same case. Electret microphones needs some power to operate. The power (typically 4-10V) is fed to microphone through resistor (typically 1-10 kohm). The electret microphone capsule takes typicaly 0.5-2 mA current when it operates.

       vcc
        O
        |
        /
        
        /
          EQUAL TO REQUIRED IMPEANCE
        /  EX.= 1000 Ohm
        
        |
        |     CAPACITOR MOST ANY VALUE 10uF 16v
|---|   |  + | /
|   |---0----| |-------   AUDIO OUT
|   |        | 
|   |----O--------------
|---|    |
         |
       -----
        ---
         -
Here is another electret microphone powering shematic:
                               capacitor (0.5 uf or so)

                                   | |
    +---------------------+--------| |--------------> to amplifier
    |                     |        | |
    | (positive lead)     |                 _   _
    |                     +----------/ \_/ \_/----------+
   MIC                          (resistor 1-2K or so)   |
    |                                                   | +
    | (ground lead) (-)                              -------
    |                              (battery 9v or so)  ---
    |                                                   |
    |                                                   |
    +---------------------------------------------------+----> ground
                                                                to amp

 


 

Last modified: May 28, 2002
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