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Strange phenomenon

Discussion in 'Recording' started by Unregistered, Sep 25, 2011.

  1. Unregistered

    Unregistered Guest

    I noticed that when I hook a patch cable (TS 3.5mm phone jack) into the front input of my computer, and I touch the tip with my finger, and of course if I have some program setup for live playback, I get a tone, an audible tone. It's fundamental is 60 Hz and contains seemingly exclusively odd harmonics. I notice that if with my other hand I grab my metal bed frame (I have a loft with a table underneath, so as I sit at my computer, I just need to reach up to grab my bed frame), it gets louder. On the other hand if I touch both the tip and the sleeve of the phone jack, or if I put my other hand on my computer case, it quiets down. But if the cable is plugged into back panel input, this doesn't happen. So what exactly is happening?

    Some technical details to consider:
    1) The front input is part of the computer case, so there's a cable running from it to a hook up on the motherboard, sharing space with a number of power cables for fans, disk drives, and the motherboard itself. Is this the noise source, or is it the human body's RF receptive properties?
    2) The place where the front input cable meets the motherboard is right next to my wifi card, but the antenna's on the outside so I suspect that this is irrelevant.
    3) I think I might have damaged the front input by not plugging a plug in all the way once.
     
  2. Unregistered

    Unregistered Guest

    I'm picking up radio

    I'm picking up radio now, and I'm really not sure how, if I touch the shoulder and the tip at the same time, as mentioned earlier the buzzing quiets down but I'm also picking up 830 AM. Does anyone know how I can change the channel?
     
  3. Mysterious Squirrel

    Mysterious Squirrel Active Member

    Bedstead Concerto

    You could have done many things to induce this. I find connecting myself up to the national grid produces a high pitched B# several octaves higher than I can normally hit.
    In general, most find the more common approach of silence is good wheras buzz, in whatever key, is a short circuit and whilst you might get away with it on a 150w Fender guitar amp, not so with microchips.

    So stop playing with your plugs, plug them in and leave them alone.

    MS
     
  4. Unregistered

    Unregistered Guest

    What exactly do you mean by "plug them in and leave them alone", are you saying I may be damaging my computer by doing this?
     
  5. Mysterious Squirrel

    Mysterious Squirrel Active Member

    Not at all but it doesn't do anything any good having its terminals tampered with while live. Computer hardware can be completely burned out by the static charge from your finger.

    Just so you know
     

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