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Adafruit MAX4466 mic board connection to audio in on mini DVR

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by hoghunter, Jul 23, 2017.

  1. audioguru

    audioguru Well-Known Member Most Helpful Member

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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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  2. hoghunter

    hoghunter Member

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    I'll do that. Thanks AG!
    Should that clean up much of the remaining noise too?
     
  3. hoghunter

    hoghunter Member

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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......
     
  4. dave

    Dave New Member

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  5. jjw

    jjw Member

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    Fan noise from PC ?
     
  6. audioguru

    audioguru Well-Known Member Most Helpful Member

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    Is the faint noise the tapping that you had before?
     
  7. hoghunter

    hoghunter Member

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    No. The tapping is gone. As jjw suggested, it could be caused by the cooling fan in the PC. I will take the unit to a separate area and see if there is a change.
     
  8. hoghunter

    hoghunter Member

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    Maybe... have not tested yet, but will let you guys know.
     

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