[Ti] Annoying hum

[John Griffin]

David Brostoff typed this message on 4/27/03 5:58 PM:

> Whenever I am on the telephone and touch the case of my Ti 667 II (as
> when I am using the keyboard and my palms are on the palmrests), the
> person I am talking to and I can both hear an annoying hum coming
> through the phone. I have tried a different telephone and get the
> same results. I never had this problem with previous plastic-cased
> PowerBooks (180, 540, 5300, WS II).
> 
> The hum goes away if I unplug the phone and just run it on its backup
> battery, but this removes most of the phone's functionality. It also
> goes away if I unplug the PowerBook, but this requires endless
> charging and swapping of batteries while I am working at my desk.
> 
> By the way, the phone and PowerBook are plugged into two different
> wall outlets.
> 
> Any suggestions?
> 
> David Brostoff

I seem to remember an old adage about installing Stereo equipment. When
ground hum is detected through the speakers, the first thing you should do
is reverse the A/C plugs of the equipment one at a time. I have never found
it to help, but try it and see...


jg