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Does any one know why the use if this buffer in the circuit? because I think there is no filter!!

Could anyone explain this please. Thanks and best regards enter image description here

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The output from the mic which comes in on MIC_IN_FA_P is going to have a relatively high impedance, i.e., it won't be able to drive very much current. The buffer amplifier is able to convert a low current on the input to a higher current on the output.

C1735 AC-couples the MIC_IN_FA_P line to the DC bias, which is presumably in place so that the amp can be powered with only a single +DC rail. Similarly, C1742 AC-couples the output of the buffer to wherever it goes.

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Typically a current buffer amplifier is used to transfer a current from a first circuit, having a low output impedance level, to a second circuit with a high input impedance level.

from https://en.wikipedia.org/wiki/Buffer_amplifier

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  • \$\begingroup\$ @AZIZI so plz accept it as answer :-) \$\endgroup\$
    – Yagel
    Oct 20 '16 at 19:06

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