[sdiy] FW: earthing??

[Dan Snazelle]

a few questions...

the power supply disconnected from my boards? so test the BOARDS and pots between +v and gnd? and -v and gnd?

also...you said to test for 0v AND gnd...is there a difference?

also...is there any difference between earth and ground? in other words...if i do a test for continuity between the EARTH LUG on the PSU and the GND wire of the ASM2 (for example) should i get a zero resistance reading?

I keep getting a reading around 10 or 14.

one thing that happens is when i hook up the earth lug to my PSU and then the case to the gnd out of the PSU, it will work for a bit but then when i flip a switch, it will cut out for a moment and then pop back in...not good behavior!

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: elby_designs at ozemail.com.au
> To: synth-diy at dropmix.xs4all.nl; subjectivity at hotmail.com
> Subject: Re: [sdiy] FW: earthing??
> Date: Tue, 25 Nov 2008 10:25:38 +0900
> 
> With no power turned on, and the power supply disconnected from the system ie the 
> +ve and -ve rails are connected to the power supply, measure the impedance between 
> each rail and 0V and GND. This should indicate if there is a short or very low-
> impedance path in the system
> 
> Best regards
> Laurie Biddulph
> www.elby-designs.com
> 
> On Tue Nov 25 11:58 , Dan Snazelle  sent:
> 
>>
>>
>>
>>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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>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>)
> 
>