Panasonic GS120 Camcorder sound problem

Discussion in 'Professional Video Production' started by Rob J, Nov 26, 2005.

  1. Rob J

    Rob J Guest

    These miniDV camcorders have an input for an external (stereo) mic. That
    is the input to use if you want to drive it from an external sound
    source while recording onto tape in camera mode.

    I have tried this a couple of times, using a computer audio cable
    plugged into the external mic jack, but the sound was ruined by a very
    loud hum.

    As the camcorder was running off its own battery in one case, it could
    not be an audio hum loop, and the source device was not producing the
    hum.

    Any ideas?
     
    Rob J, Nov 26, 2005
    #1
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  2. Rob J

    Ty Ford Guest

    Yes, you were probably trying to plug a mono mic into a stereo input. Don't
    do that.

    Ty Ford



    -- Ty Ford's equipment reviews, audio samples, rates and other audiocentric
    stuff are at www.tyford.com
     
    Ty Ford, Nov 26, 2005
    #2
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  3. Rob J

    Rick Merrill Guest

    Ty, isn't it possible to wire left and right together or should one just
    use (say) the Left side and leave the Right open?
     
    Rick Merrill, Nov 26, 2005
    #3
  4. Rob J

    Rick Merrill Guest

    maybe the solution is to bring in your external source on just the Left
    side and leave the right side open (or grounded)?
     
    Rick Merrill, Nov 29, 2005
    #4
  5. With no knowledge of this device:

    A loud hum could be caused by a broken earth wire in the microphone lead, or by
    the connections being reversed at the plug end.

    Some microphone inputs supply a voltage to power the microphone. If your
    microphone doesn't require this (if it's dynamic rather than electret) putting
    a capacitor of say 1uF in the signal leads should stop current flowing out of
    the input through your microphone. Messing around with a multimeter and a plug
    in the microphone input socket should give you some clues. Also, you should be
    able to make each channel hum in turn by touching the tip and ring contacts
    with something metallic and ungrounded. That would prove that it's a stereo input.

    Many microphone inputs are mono only. What does the user manual say about the
    microphone input ?
     
    Mark Robinson, Nov 30, 2005
    #5
  6. Rob J

    Ty Ford Guest

    You're using the wrong plumbing and the camcorder is making you aware of it.

    It's a stereo input. Don't plug a mono mic in there.

    I have a little book that might help you in answering many of your questions.
    "The Audio Bootcamp Field Guide."

    check it out at www.tyford.com

    Regards,

    Ty Ford


    -- Ty Ford's equipment reviews, audio samples, rates and other audiocentric
    stuff are at www.tyford.com
     
    Ty Ford, Nov 30, 2005
    #6
  7. Rob J

    Rick Merrill Guest

    Thanks!!!!!
     
    Rick Merrill, Nov 30, 2005
    #7
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