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Eric, the DAC sources current, so the op amp needs a negative supply, and the output of the opamp will range from 0V to -xV, where x depends on the feedback resistor.
Okay I'll do some tests. I'll keep you updated; but in general, Is it possible to connect the microphone directly to a voltmeter and obtain a certain voltage? say, in the mV range? 'cause I've done so and I found nothing (0V).
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