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Old 10-10-2010, 05:20 PM   #1
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Humming from new TV

I installed a new flat screen TV today and ran a headphone wire from the Tv to my Stereo Aux Jack. I am getting a humming noise when I try to listen this way. There is no hum from the TV speakers and there is also no num from the Aux input when I use my Ipod. Any thoughts are appreciated.

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Old 10-10-2010, 07:02 PM   #2
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Does the wire you installed cross any electrical power lines? If so, that may be the cause. Another and more probable cause is that your Television is not grounded. Since the radio in your Airstream is DC, it is attached to the same grounding plane as the rest of your trailer, and just like an automobile, all the components need to touch the same plane. I am guessing the Television is AC. If that is the case, a filter such as the ones sold at auto parts stores attached to the input line from the Television to the radio may solve the problem.
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Old 10-10-2010, 09:00 PM   #3
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The ones Airstream is installing now have isolation transformers in the audio out to prevent this.

If you do a search on "audio isolation transformer" you should find some good alternatives for aftermarket ones. In most cases, a filter alone will not help; a transformer is required.

The underlying problem is that the unbalanced audio connections in widespread use in home stereo equipment are extremely susceptible to hum. Stage, studio, and broadcast audio systems all use balanced connections which add a third wire, driving up the cost, but clearing up most of the hum.
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Old 10-10-2010, 09:58 PM   #4
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May be as simple as turning the stereo down and using the TV volume to control level. I keep the stereo down to about #8 or below and the TV at about half volume. I hear not buzzing or interference this way. If that doesn't work, try some of the isolation suggestions above.
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Old 10-11-2010, 10:53 AM   #5
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Maybe musicmaster will post here.
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Old 10-15-2010, 07:41 PM   #6
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The ground loop isolator worked great. Thanks Much.
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