[sdiy] FW: earthing??

[Tom Bugs]

You *DON'T* want the regulator bodies to be touching anything else!
- use standoffs to give clearance.

Dan Snazelle wrote:
> 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
>>>>
>>>>
>>>>
>>>> _______________________________________________
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>>>>         
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