Charger humming?

Discussion in 'iPhone Accessories' started by jjk454ss, Oct 11, 2012.

  1. jjk454ss macrumors 601

    jjk454ss

    Joined:
    Jul 10, 2008
    #1
    I have a charger/surge protector with 2 USB ports and 3 outlets. I just put it near my bed, so maybe it's always hummed and I never heard it till now, but when I plug in my iPhone or ipad it starts making a humming sound. Is this normal? Any reason not to use it?
     
  2. westom macrumors regular

    Joined:
    Nov 8, 2009
    #2
    Coils are wound and then sealed with a varnish (or equivalent). So that winding do not vibrate. Sometimes the winding is not tight and varnish fails to seal that wire. You are hearing the wire vibrate. That vibration typically causes no threat to human life or electronics. And would become more obvious due to how some reactive appliances consume power.
     
  3. jjk454ss thread starter macrumors 601

    jjk454ss

    Joined:
    Jul 10, 2008
    #3
    Thanks. I thought it was fine, but I didn't want to take a chance so etching was wrong with it and it would do something to my devices plugged in to it. Wrong voltage or something strange:confused:.
     
  4. Dennis187 macrumors regular

    Dennis187

    Joined:
    Jun 26, 2010
    Location:
    below you
    #4
    At least yours sings for you, give it a plus.
     
  5. jjk454ss thread starter macrumors 601

    jjk454ss

    Joined:
    Jul 10, 2008
    #5
    Except I'm trying to fall asleep:D.
     

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