Electronics > Beginners
Capsule microphone biasing decoupling?
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alexg:
Hi All, not sure if I worded it correctly but basically I am looking for answer perhaps to one of simplest questions: will placing decoupling capacitor (C18 in the circuit below) at the mic biasing circuit help at all to mitigate a bit of a ripple because its powered from switching regulator? Or it makes no difference or even make things worse?

RoGeorge:
Maybe, but if you place a resistor or inductance between V33 and the node beteween C18 and the microphone's resistor, then it will certainly help, because it will create a low pass filter for the power noises only.
alexg:
I have to double check, is this what you advising?
Zero999:

--- Quote from: alexg on May 21, 2018, 02:09:37 pm ---I have to double check, is this what you advising?

--- End quote ---
That seems reasonable, although C18 may need to be much bigger for it to be effective.
Audioguru:
I use the mic's same decoupling for the biasing of the mic preamp like this:
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