Built in microphone characteristics

tigerwillow1

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I'm trying to troubleshoot an audio problem and not getting very far. Does anybody know what type of microphone is in the dahua turrets? If I hook it up to a line input (or scope) should I be able to detect some output? Or does it possibly need to be powered?
 

tangent

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There's an op-amp pretty close to the mic connector. I'd start there.
 
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