AC Hum problem

Sun Apr 6 00:24:48 EDT 2008

Are you sure that none of the two-prong ac plugs on any relevant piece
of equipment have been reversed since your last successful use of the
system? If there are any ac cords that you can plug in either way and
that you occasionally plug and unplug, the plug polarity is a likely
cuprit. And, in fact, is it possible to reverse the polarity of the
patch cord itself? If so, try reversing it--one end at a time.

Dan Strassberg (
eFax 1-707-215-6367

----- Original Message ----- 
From: "A. Joseph Ross" <>
To: "Boston Radio Group" <>
Sent: Sunday, April 06, 2008 12:09 AM
Subject: AC Hum problem

> Maybe some techies out there can help me with this.
> I got a new car radio awhile back, which has a CD player, rather
> than
> a tape player.  So I decided to record some of my tapes into my
> computer and put them onto CDs.  I got a long patch cord that runs
> from my stereo in the livingroom into my computer in the study, and
> it worked fine last time I used it.
> This time, as soon as I connected the patch cord, there was a loud
> AC
> hum from the computer.  I haven't been able to get rid of it.  It's
> there as long as the stereo is connected to the computer sound card.
> Even if the stereo is turned off.
> Anyone have any ideas what's going on and what I can do about it?
> -- 
> A. Joseph Ross, J.D.                           617.367.0468
> 92 State Street, Suite 700                   Fax 617.507.7856
> Boston, MA 02109-2004          

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