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mic and Impedance matching

Discussion in 'General Electronics Discussion' started by larissam, Jan 15, 2015.

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  1. larissam


    Jan 15, 2015

    I am working in a project, where i have a Microphone Electret with a impedance at the output of 2,2kohm. and a impedance matching (FET) where i am using Mosftet VQ1000J.

    My target is to see at the output of the Transistor a sinusoidal signal from the microphone.
    When i tried the circuit just the impedance matching with a signal generator at the input using
    frequency 1khz, offset 1 volt and a peak to peak voltage amplitud 2 Volts. i got the signal i am looking for BUT when i connected directly to the microphone i dont get any signal at all.

    I already tried the microphone alone and it works well.

    I dont have to much knowledge about transistors and with audio circuits.
    I know there are many things i am missing to make the connection between the microphone and the impedance matching work but i dont know which one should i look.

    I dont know if the impedance from the microphone could be a reason why it doenst work.

    any idea, i will be really grateful

    thanks in advance


  2. BobK


    Jan 5, 2010
    Hi and welcome to the forum!

    Typically, electret microphones have the JFET amplifier built in, and they need a power connection to work.

    This article shows you how it is connected:

    The output from the capacitor should provide a signal of about 5mV and go into a microphone preamplifier.

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