[sdiy] FW: earthing??

[mark verbos]

Just do it like Buchla did.... put some strips of electrical tape on  
the enclosure wall!



On Nov 25, 2008, at 8:05 AM, 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
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Synth-diy mailing list
>>>> Synth-diy at dropmix.xs4all.nl
>>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>
>>
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