Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ntvax!doug
From: doug@dept.csci.unt.edu (Douglas Scott)
Newsgroups: comp.sys.next
Subject: Ground loop problems, continued
Message-ID: <1990Jul2.185743.20350@dept.csci.unt.edu>
Date: 2 Jul 90 18:57:43 GMT
Sender: Douglas Scott
Reply-To: doug@dept.csci.unt.edu (Douglas Scott)
Distribution: usa
Organization: University of North Texas
Lines: 20

I  hope someone can shed some light on this one for me:  I am having
severe difficulties with connecting my line outs to my amp.  I have some kind
of bad ground loop, and when I connect the cables, I  get BAD hum, regardless
of the switch settings on the amp...it comes through everywhere!  I  have
3-prong grounded plugs in my apartment, and I  checked them for connections.
I  have the amp plugged into the same isolator box as the NeXT, which I  have
to avoid power surges.  I have my tape decks and stuff, which are also plugged
into the amp, still plugged into another wall socket-- but I  have even tried
wiring the grounds on the two sockets together...all to no avail.  The stereo 
outs work fine when plugged into a DC powered tape deck, so I know they work.

Has anyone else ever had this problem??  It is a real pain.  Someone
responded that I  may need audio isolator transformers...great...so why doesnt
NeXT include them with the machine?

Thanks in advance.
-- 
___________________________________________________________________________
Douglas Scott
doug@dept.csci.unt.edu