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    CoolerMaster USNA 95 AC Adapter on Z -- humming sound?

    Discussion in 'VAIO / Sony' started by komugi, Nov 11, 2010.

  1. komugi

    komugi Notebook Geek

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    I was wondering if anyone else has tried this adapter.. is there a humming sound to the adapter when you have it plugged in? Sounds a bit like coil hum, but want to make sure that mine is not faulty.
     
    komugi, Nov 11, 2010
    #1
  2. thegre8tone

    thegre8tone Notebook Enthusiast

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    Got the same adapter...It has the sound that you're refering to. I have to put my ear close to the adapter to hear it. Hopefully others can chime in here to see if the same thing occurs...
     
    thegre8tone, Nov 11, 2010
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  3. ZugZug

    ZugZug Notebook Evangelist

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    It depends on whether you have it under load and what type - USB, laptop, both. Sometimes it's noticeable, sometimes it's almost gone.
     
    ZugZug, Nov 11, 2010
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  4. travfar

    travfar Notebook Evangelist

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    Isn't that just the transformer?
     
    travfar, Nov 11, 2010
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  5. ZugZug

    ZugZug Notebook Evangelist

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    It's a switching power supply, no transformer, most likely uses single coil/inductor for energy storage. The hum is determined by switching frequency.
     
    ZugZug, Nov 11, 2010
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  6. TofuTurkey

    TofuTurkey Married a Champagne Mango

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    Darn, I was all ready to talk about this:

    [​IMG]
     
    TofuTurkey, Nov 11, 2010
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  7. warrior811

    warrior811 Notebook Guru

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    Only if I put my ear right to it. Yer paranoid
     
    warrior811, Nov 11, 2010
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  8. komugi

    komugi Notebook Geek

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    Actually, mines fairly audible, I can hear it from 1/2~1 ft away
     
    komugi, Nov 11, 2010
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  9. warrior811

    warrior811 Notebook Guru

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    You probably have better hearing than I. Cya I'm off to a rock show
     
    warrior811, Nov 11, 2010
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  10. kvnchg

    kvnchg Notebook Guru

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    I have the same adapter. Like warrior811, I can only hear it if I press my ear against it. However, it is noticeably louder than the stock adapter that came with my Z. Maybe I just have bad hearing like warrior811 XD
     
    kvnchg, Nov 12, 2010
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  11. blaze_00

    blaze_00 Notebook Enthusiast

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    Just had mine for about 2 weeks, and don't notice any humming at all right now (In a fairly quiet lab).
     
    blaze_00, Nov 12, 2010
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  12. travfar

    travfar Notebook Evangelist

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    Put it on the floor. Problem solved.
     
    travfar, Nov 12, 2010
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