[sdiy] grounding sheilded wire?

[harry]

Its still a good idea to ground the shield at one end... even for the
"tip only" type plugs. This will minimize capacative coupling between
the wires.  Terminate the shield at the PCB end... and leave the jacks
connected only by the center conductor. I like a little piece of heat shrink
tubing at this end to make things pretty.

H^) hary

Dave Krooshof wrote:

> >But I wonder
> >how I am supposed to ground the sheild, do I just connect one end to ground
> >and leave the other end floating?
> Ideally, each module of your synth is grounded in only one way.
> This means that if you connect the shield of your wire to
> ground on both ends, that your likely to have more then one
> ground lead, simply because you'll probably connect more then one
> lead to a module, and you might have chosen to connect it to ground
> internally as well.
>
> What you can do, is to make a central ground somewhere in the
> middle of your box. Then you connect each module's ground to that.
> (like a star) The female connectors of your modules are grounded
> to the modules ground.
>
> Then your wires. In a jack plug, I'd connect the shield to one connector.
> I'd leave it unconnected on the other side. This way, you won't
> connect two "beams" of the "star". I might be wrong, but a banana plug
> doesn't have a ground ring, does it? What I call a banana plug is a
> one-tip-only thing.
>
> I do not know is shielding is of much use then. It might even work as
> a small capacity... Do you happen to have any hum/hf problems
> that make you want to shield?
>
> >is it ok to just have wires
> >tapping ground with loose (ie not connected to anything) ends?
> >or does it need to go in some sort of continuous loop?
> Synths differ from "guitars with effects" in the fact that
> guitarist tend to patch modules in a line...
> guitar-->fuzz-->wah-->flanger-->chorus-->amp.
> They connect the shielding to earth in the amp, so everything
> inline is grounded.
>
> ...and synthesizer players tend to build networks, in which their
> modules can be connected in more then 2 ways. If you'd choose
> to ground all shieldings of your wires on both ends, you'd make
> loops in the grounding. Ground-loops are a problem because they
> behave like a dynamo: The alternating magnetic fields of
> electricity in your house will generate some current flowing
> in your groundloop (a simple coil). Hummmmmmm....
>
> Dave
>
> BTW in the studio-control room, I can patch the mixerconsole
> to either the studio, the theater, or the dance theatre. I
> measured their grounds... 4 volt AC. I decided to connect a led.
> I glowed! In the building are 3 rods in the ground to ground
> the building. The Amsterdam soil is a battery...