Can anyone tell me if the output voltage of a microphone (like the type on a webcam) is an AC voltage? And whatever it is, can it be measured on a standard voltmeter?
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The audio signal from a microphone will be AC, with the frequency and amplitude (voltage) of the signal depending on the sound that the microphone is picking up.
For electret microphones, the audio signal will usually also have a DC bias, which can be removed with an AC coupling capacitor.