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fm modulator: high pitch whine

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  • fm modulator: high pitch whine

    I'm using the FM modulator as seen here:
    http://www.davidnavone.com/linedrivers.html
    N-724

    there is a high pitch "whine" that increases when I turn the volume on the radio up. It's there when the car is on or off. it's there even when there are no inputs plugged into the modulator.

    I contacted the manufacturer, and they suggested that it was alternator whine. I didn't think there would be alternator whine when the car is off ...
    they suggested "filtering" the input current to the modulator. How can I filter the power coming into it? a voltage regulator of some sort?

    Thanks
    -Matt

  • #2
    they have noise filters at pep boys....they cost like 10 to 15 bucks...should take care of it..also make sure you have a good ground!
    i got dat ***** sittin on 22s! SUPERMAN EDITION!

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