[sdiy] Avoiding Ground Loops on Panels

[Scott Stites]

Hi Gang,

Thanks for all the great advice - it seems that whilst I stay in one
cabinet, I should be fine without worrying too much about ground loops.  One
of these days (not soon), I'm sure I'm going to want to start a second
cabinet, and then I'll probably ask the same question again, knowing my
memory.

Thanks, Tim, for doing all that groundwork - that's some really good stuff
you dug up.

Happy holidays to everyone; may your new year be filled with sounds great
and small from circuits wise and wonderful.  Oh, yeah, don't forget to post
schematics for the wise and wonderful circuits =-D.

Scott


----- Original Message -----
From: "Tim Johnson" <ifixaudio at hotmail.com>
To: <scottnoanh at peoplepc.com>; <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, December 23, 2003 9:04 PM
Subject: RE: [sdiy] Avoiding Ground Loops on Panels


> Wow, that took some surfin' but here ya go Scott.
>
> My quest for insulated jack bushings for you took me to the following snip
> from the Aiken amps site for members seeking insulated 1/4" style at:
>
> http://www.aikenamps.com/StarGround.html
>
> >>How are the input jacks isolated?
> >There are some good isolated jacks available from Cliff and Rean that
most
> >companies use. Stay >away from the plastic-nosed units and get the better
> >chrome ferrule jacks. These are now being >supplied by Neutrik, who
> >purchased Rean. They aren't as good a quality as Switchcraft jacks, but
> > >they are isolated. You can use shoulder washers to isolate the
> >Switchcraft type jacks, if you can >find one that will fit the hole.
> >Newark Electronics carries them, but they are not listed in the >catalog.
> >The part numbers are: 94F8935 (Switchcraft S1028) @ $0.13 ea. and 94F8936
> >(S1029) >@ $0.28 ea. These mount in a 7/16" hole - not a 1/2" like the
old
> >ones.
>
> Which in turn sent me to the Switchcraft site below with associated
> schematic link that states the part you need is an S1564 (Newark part
> #27B9044) and an S2207.
>
> http://www.switchcraft.com/products/jack-112.html
>
> And the hardware list, with drawings link.
>
> http://www.switchcraft.com/products/jack-147.html
>
> Your welcome, hope this helps and
> Happy Holidays
>
> Jim(whew)
>
> >From: "Scott Stites" <scottnoanh at peoplepc.com>
> >To: synth-diy at dropmix.xs4all.nl
> >Subject: [sdiy] Avoiding Ground Loops on Panels
> >Date: Tue, 23 Dec 2003 10:03:53 -0800 (PST)
> >
> >Hi List,
> >
> >I've been building panels for my synth using un-anodized aluminum stock.
I
> >plan
> >to put the legends onto the panels much in the same way that Ray Wilson
did
> >with
> >his mini-synth, IE laminating paper labels onto them as shown here:
> >
>
>http://www.musicfromouterspace.com/analogsynth/SOUNDLABMINISYNTH/soundlab.h
tml
> >
> >The connectors I'm using, 3.5 mm, will still ground to the back of the
> >panel,
> >which to me means that I'm just asking for ground loops.  I thought about
> >DIY
> >anodizing, but stopped reading pretty soon into it when it mentioned the
> >vat of
> >sulphuric acid that I'd need.
> >
> >So - how does one fully isolate the ground on the connectors from the
panel
> >in
> >this case?  I recall someone mentioning that they used nylon washers.
> >Where
> >could I find these washers?  Is there some sticky mylar tape I can get?
> >Will a
> >clear coat of laminate isolate the whole panel?  Am I asking too many
> >questions?
> >
> >Any advice most appreciated,
> >Cheers,
> >Scott
>
>
>
> >From: "Scott Stites" <scottnoanh at peoplepc.com>
> >To: synth-diy at dropmix.xs4all.nl
> >Subject: [sdiy] Avoiding Ground Loops on Panels
> >Date: Tue, 23 Dec 2003 10:03:53 -0800 (PST)
> >
> >Hi List,
> >
> >I've been building panels for my synth using un-anodized aluminum stock.
I
> >plan
> >to put the legends onto the panels much in the same way that Ray Wilson
did
> >with
> >his mini-synth, IE laminating paper labels onto them as shown here:
> >
>
>http://www.musicfromouterspace.com/analogsynth/SOUNDLABMINISYNTH/soundlab.h
tml
> >
> >The connectors I'm using, 3.5 mm, will still ground to the back of the
> >panel,
> >which to me means that I'm just asking for ground loops.  I thought about
> >DIY
> >anodizing, but stopped reading pretty soon into it when it mentioned the
> >vat of
> >sulphuric acid that I'd need.
> >
> >So - how does one fully isolate the ground on the connectors from the
panel
> >in
> >this case?  I recall someone mentioning that they used nylon washers.
> >Where
> >could I find these washers?  Is there some sticky mylar tape I can get?
> >Will a
> >clear coat of laminate isolate the whole panel?  Am I asking too many
> >questions?
> >
> >Any advice most appreciated,
> >Cheers,
> >Scott
> >
> >________________________________________________
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>
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