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From: bill@bilver.UUCP (Bill Vermillion)
Newsgroups: sci.electronics
Subject: Re: Define "GROUND" (& how to solve a "GROUND" loop prob)
Keywords: ground, loops, earth, ship, plane, audio
Message-ID: <215@bilver.UUCP>
Date: 28 May 89 20:01:26 GMT
References: <3917@merlin.usc.edu>
Reply-To: bill@bilver.UUCP (Bill Vermillion)
Distribution: na
Organization: W. J. Vermillion, Winter Park, FL
Lines: 25

In article <3917@merlin.usc.edu> cyamamot@nunki.usc.edu (Cliff Yamamoto) writes:
>Is this supposed to connect the POWER SUPPLY grounds to one point OR connect
>the SIGNAL grounds to one point?  Or are these two "grounds" the same?
.....
>                                           Funny thing was I got a small tingle
>of a shock just before I connected the car body and the stereo ground together.
>It's hard to believe by sitting in a car you can get a shock by touching the
.....
>Any info on what "grounds" are SUPPOSED to be or how to fix this problem would
>be really appreciated!

Connect the power supply ground and the audio grounds all to the same point.
This should be a wire that runs to "ground" side of the battery.

You have a classic ground loop because there is resistance between the point
you have connected to the car body, and the point of connection to the
battery.  That's why you got the tingle.  The body appears not to be at ground
potential.




-- 
Bill Vermillion - UUCP: {uiucuxc,hoptoad,petsd}!peora!rtmvax!bilver!bill
                      : bill@bilver.UUCP