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Recently i have installed a Stereo system in my car, that works flawlessly when i play Music and Videos through an SD card or Pen drive, The problem comes when i am listening to FM radio, My Stereo system plays buzzing sounds when i pass near to High tension cables, power lines in local areas, near to transformers , when i press any buttons/switches on dashboard of my car and also when i turn on windscreen wipers. I have been noticing this from a while, and come to conclude that EMI is the real culprit!

How can i get rid with this problem.? should i add Ferrite bead to coaxial cable of FM antenna.?

Thank you

CharlieRB
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Mudassir Hussain
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2 Answers2

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System ground is critical. Ensuring the system is properly grounded solves a lot of issues.

You mention this only happening when listening to FM radio. That leads me to believe the system ground is likely good, but you may have a problem with the antenna. This is easy to check.

Unplug the antenna and see if the noise continues.

  • If it stops, then you need to use an antenna noise suppressor that plugs in between the antenna and the receiver.
  • If it continues, there is likely a problem with the receiver.
CharlieRB
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I think the problem is in your stereo system. A long time ago, I built a stereo mixer using operational amplifiers that allowed me to have multiple sources connected to the amplifier on at the same time. Well, I didn't protect it well enough against EMI and whenever I turned on the compact fluorescent light in my room, I heard buzzing sounds.

All cars have an antenna, probably without any ferrite beads. However, most cars have a stereo system that is well-protected against EMI. Clearly, yours isn't.

First, try to check if your stereo system is grounded, as noted by bitsmack. Then, try a different stereo system if that fails to work.

juhist
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