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 [EMAIL PROTECTED] Coder / Guru / Nrrrd http://sowerbutts.com main(){char*s=">#=0> [EMAIL PROTECTED]@^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));}
