I just did some work on my car audio system and am having some problems with interference. I added a bluetooth receiver and wired it directly to my stereo cd player input. The receiver is powered from a 12V to 3.7V power supply. The cable from the receiver to my stereo is about 3-4ft long, and since the shielding is in contact with the bare ground, the shield is terminated at both ends, rather than just one. The setup works great with the engine off, but as soon as the engine is started, I get a whine that matches my revs. Any ideas for a solution? Is the problem likely to be with the audio cable, or with noisy power to the 12V to 3.7V supply?

  • \$\begingroup\$ Welcome. Repair questions are off-topic on this site. Suggest you go to a car stereo installation shop and get the 'whine' filter you need. \$\endgroup\$ – Sparky256 Feb 21 at 1:32
  • \$\begingroup\$ Probably a ground loop issues within the system. Search "ground loop eliminator", find the appropriate product for you as some may degrade the audio quality by greatly changing the frequency response as well as total harmonic distortion. \$\endgroup\$ – Unknown123 Feb 21 at 3:17
  • \$\begingroup\$ Shield terminated in both ends and ground loops. Hmm that never happened before. \$\endgroup\$ – Lundin Feb 22 at 9:11

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