[sdiy] FW: earthing??

Thu Sep 25 19:44:00 CEST 2008

Not strictly true. If the body of the regulator is at GROUND potential as is 
the case with many then being connected to the body gives additional 
heatsinking. If the bodies of the regulators are not at GROUND then they 
should have been mechanically insulated in the original build and shouldn't 
require the user to do additional work

Best Regards

(Mr) Laurie Biddulph
Phone: +61 (0)2 4340 0938
Mobile: 0400 257 645

Elby Designs
ABN: 70 022 727 605
http://www.elby-designs.com

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----- Original Message ----- 
From: "Tom Bugs" <admin at bugbrand.co.uk>
To: "Dan Snazelle" <subjectivity at hotmail.com>
Cc: "sdiy" <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, November 26, 2008 12:23 AM
Subject: Re: [sdiy] FW: earthing??

> 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
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Synth-diy mailing list
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>>
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