[sdiy] FW: earthing??

[Dave Magnuson]

Hi Dan,

Measure the voltage between the earth ground and the chassis.  If it's at or 
near either +/- 15V, you can almost guarantee a hidden short to the rail 
somewhere.  Might help you track down the issue a little more quickly

Also:  If you're using any metal stand-offs beneath your PCBs, perhaps one 
is touching a trace?

Dave Magnuson


----- Original Message ----- 
From: "Dan Snazelle" <subjectivity at hotmail.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Monday, November 24, 2008 7:58 PM
Subject: [sdiy] FW: earthing??


>
>
>
> i am putting in the final power supply for my project. it is a dual 12 or 
> 15 volt supply. (power one)
>
> Now i have been earthing both the case and the PSU off of the earth tab on 
> the AC inlet with no problem all week. But strangely, when i hooked this 
> up today I initially thought the PSU was busted and only after a few hours 
> of troubleshooting did i figure out that it worked fine when  I 
> disconnected the wire from the  instrument CASE (but not from the PSU 
> body)
>
>
> I WANT to be able to earth the case of the instrument...so any ideas as to 
> what might be going on?
>
> my first thought was that maybe a positive rail or negative rail was 
> touching the panel through a pot but at least on visual inspection this 
> doesent seem to be the case.
>
> (and by the way i AM now soldering my connections to the pins of the pots, 
> not the holes)
>
> thanks
> --------------------------------------------
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>
> http://www.myspace.com/lossnyc
>
>
> http://www.soundclick.com/lossnyc.htm
>
>
> http://www.indie911.com/dan-snazelle
> (or for techno) http://www.myspace.com/snazelle
>
>
>
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