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Adafruit MAX4466 mic board connection to audio in on mini DVR

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Your capacitor C1 was in the wrong place and it disconnected some of the grounds.
Do a "star" ground like this:
 

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    star ground.png
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Fixed the ground wires. Faint background noise remains, but voice is loud and clear. I am working on a table with a PC 12" away, so maybe I am getting some interference from the CPU......
 
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