[sdiy] FW: earthing??

[Dan Snazelle]

ok

it seems that with this PSU..it wasnt the screw. all works fine if I RUN a earth wire to the screw terminal and then run a wire to my case from grnd ONLY IF the PSU is on its side (not flat)

it seems when it is flat, the only thing properly touching the case is the tip of the regulator heatsinks (i think thats what they are)

in other words..when the BODY of the psu is properly flush against the case...earthing works 

it took me a long time to get this right.

if anyone knows why this is.....

thanks

--------------------------------------------
check out various dan music at:

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 




> From: subjectivity at hotmail.com
> To: kingravine at comcast.net; synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] FW: earthing??
> Date: Tue, 25 Nov 2008 12:35:39 +0000
> CC: 
> 
> 
> i switched out the SCREW holding in the earth line to the psu....it now SEEMS ok....maybe the earth wasnt tight enough???
> 
> is there  simple way to test for danger?? (other than seeing if + or_ are on the case with a dvm??
> 
> thanks
> 
> --------------------------------------------
> check out various dan music at:
> 
> 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 
> 
> 
> 
> 
>> From: KingRavine at comcast.net
>> To: subjectivity at hotmail.com; synth-diy at dropmix.xs4all.nl
>> Subject: Re: [sdiy] FW: earthing??
>> Date: Mon, 24 Nov 2008 20:25:48 -0500
>> 
>> 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" 
>> To: 
>> 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
>>> --------------------------------------------
>>> check out various dan music at:
>>>
>>> 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
>>>
>>>
>>>
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy 
>> 
> 
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