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Topic: Massive PC bus noise when iPhone 5 connected via USB (Read 1826 times) previous topic - next topic

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Massive PC bus noise when iPhone 5 connected via USB
Today I noticed something very weird while listening to music via headphones on my PC. Everything was fine up to the point where I connected my iPhone 5 for charging. Then suddenly, I had massive bus noise and the fun thing was that the noise was not influenced by the PC, but the activity on the iPhone. It was much louder when I was moving my finger over the touchscreen for example or the iPhone was animating stuff such as opening a folder on the home screen. Some noise was also present when the screen was off.

Is this something caused by the iPhone itself not behaving correctly, or is it the sound card's / PC's fault?

Edit: BTW, just to be clear, I am not talking about that typical noise that occurs when the iPhone is sending data for example.
  • Last Edit: 28 February, 2013, 08:46:22 AM by Sebastian Mares

  • pdq
  • [*][*][*][*][*]
Massive PC bus noise when iPhone 5 connected via USB
Reply #1
Just to be clear, is this through a USB sound card, or the sound card built into the PC?

Massive PC bus noise when iPhone 5 connected via USB
Reply #2
Sound card built into the PC.

  • Nessuno
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Massive PC bus noise when iPhone 5 connected via USB
Reply #3
Does it happen every time and every USB port you connect the phone to?
... I live by long distance.

Massive PC bus noise when iPhone 5 connected via USB
Reply #4
It happens with every USB port, but with the front ones being louder than when connected to the rear ones. The funny thing is that I have no problem when connecting HDDs, card readers, whatsoever. Only happens with the iPhone.
  • Last Edit: 28 February, 2013, 09:53:52 AM by Sebastian Mares

  • Nessuno
  • [*][*][*][*]
Massive PC bus noise when iPhone 5 connected via USB
Reply #5
Any other available PC to try with?
... I live by long distance.

  • Rotareneg
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Massive PC bus noise when iPhone 5 connected via USB
Reply #6
Assuming you're using a front panel audio jack on your case for the headphones, try plugging the headphones into the rear audio jack and see if it still happens. Sometimes those can be really finicky when it comes to interference issues. Perhaps the iPhone's DC input isn't filtered and the rapidly fluctuating current draw is inducing noise on the +5V power line in the computer. You might try a powered hub to see if that changes anything.

  • Nick.C
  • [*][*][*][*][*]
  • Developer
Massive PC bus noise when iPhone 5 connected via USB
Reply #7
Have you tried a different cable?
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