msgeq7 feedback

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i'm using msgeq7 reference design applied in automotive environment. pass audio through, alternator whine feedback on audio. need better filter power arduino, or somehow isolate audio without signal degredation? using electret microphone instead of line in not option...

weird...   the msgeq7 running off 5v regulator, right?   the regulator should keep power-line noise out of circuit.

i wonder if it's ground loop...  if hooked-up , running, , break signal connection  msgeq7 (without changing disconnecting grounds), noise go away?




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