Re: (Offtopic) Humming on ibook2 audio port?
I have had this same trouble on my iMac since the beginning... but only
under Linux. It seems that the Linux driver doesn't do something that
the Mac OS 9 driver does... and the result is a low hum and distortion
that starts from bootup until Mac OS 9 starts to load. Under Linux,
the hum never goes away.
Do you have this problem under Mac OS 9 or Mac OS X? Even booting
from the System CD may be sufficient to tell.
Adam
On Thu, Jan 10, 2002 at 02:24:15AM +0000, William R Sowerbutts wrote:
> On Thu, Jan 10, 2002 at 03:19:18AM +0100, Siggi Langauf wrote:
> >> On my iBook2 (600/DVD+CDRW) I can hear a low frequency humming on headphones
> >> plugged into the audio jack. The hum is only there when the system is plugged
> >> into the mains. I live in the UK and it sounds like it's around 50Hz, which
> >> would match the frequency of our AC mains supply.
> >>
> >> Does anyone else get this or is it just me with the dud headphones/ibook? ;)
> >
> >I don't get this, but I'm sure it's the usual problem: you have grounded
> >your iBook with more than one wire, creating a "ground loop" into which
> >power supply wires can induce some current.
> >Typical candidates for the second wire are your ethernet or modem cable.
> >Try to unplug them (and anything else that could be connected to ground
> >level), and I'm quite sure the humming will go away, even if the power
> >supply is connected.
>
> Hmmmm. I don't think that's it -- the only cable connected to my machine is
> the power cord (and the headphones). So there's only one path to ground.
> Unless the wireless network counts? ;-)
>
> I might complain to Apple. It's quite irritating.
>
> _________________________________________________________________________
> William R Sowerbutts will@sowerbutts.com
> Coder / Guru / Nrrrd http://sowerbutts.com
> main(){char*s=">#=0> ^#X@#@^7=";int c=0,m;for(;c<15;c++)for
> (m=-1;m<7;putchar(m++/6&c%3/2?10:s[c]-31&1<<m?42:32));}
>
>
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