DIY patch bay ground noise

[Coma]

Re: DIY patch bay ground noise

That was “running” but my phone decided differently!

I think you have your two wires reversed. So the shield is hot. That will cause hum.

If you are using coax why did the first picture show two wires on each jack?

Also what are you patching together? If you patch two different pieces of AC powered gear you can introduce ground loops.


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I dont think so. Outer tab is signal path, inner is ground. Not sure if you can tell by that picture, but the extended metal "tongue" connecting to the cable end is the same piece as the outer soldering tab. And cable is connected the same way on both ends.

And ignore the first picture. I wired it that way because I'm an idiot who doesn't understand how shielded cables should be connected.

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[Darg1911]

Re: DIY patch bay ground noise

Only thing I can think of is trying a metal box with plastic jacks if you don't want the grounds isolated. Or, those same jacks if you want the grounds shared. I'm just taking a wild arse guess that, maybe, you are getting some type of outside interference. A metal box should provide some shielding. Or, maybe you could try shielding the interior of that plastic box with copper or foil tape.

[Coma]

Re: DIY patch bay ground noise

Only thing I can think of is trying a metal box with plastic jacks if you don't want the grounds isolated. Or, those same jacks if you want the grounds shared. I'm just taking a wild arse guess that, maybe, you are getting some type of outside interference. A metal box should provide some shielding. Or, maybe you could try shielding the interior of that plastic box with copper or foil tape.

I've got a metal box I'm gonna try with. Do I need plastic Jack's or will my current ones work?

[Darg1911]

Re: DIY patch bay ground noise

I've got a metal box I'm gonna try with. Do I need plastic Jack's or will my current ones work?

Your current jacks will work but they will all share the ground because the box is metal. That may work fine. If not, the plastic jacks with plastic threads would allow the grounds to remain isolated.

Like these ... http://www.neutrik.com/en/audio/plug...eries/nmj2hf-s

[Coma]

Re: DIY patch bay ground noise

Your current jacks will work but they will all share the ground because the box is metal. That may work fine. If not, the plastic jacks with plastic threads would allow the grounds to remain isolated.

Like these ... http://www.neutrik.com/en/audio/plug...eries/nmj2hf-s

Yeah, I've seen those used in some boxes. Then again half the other ones I've seen haven't. I'm finding it difficult to suss out what is the proper way to do it.

Put it this way: this box will cover connections to preamp, then FX loop send and return. With everything connected with shared ground, will this be a problem? Is there any reason NOT to use the Jacks I have?

[Darg1911]

Re: DIY patch bay ground noise

Yeah, I've seen those used in some boxes. Then again half the other ones I've seen haven't. I'm finding it difficult to suss out what is the proper way to do it.

Put it this way: this box will cover connections to preamp, then FX loop send and return. With everything connected with shared ground, will this be a problem? Is there any reason NOT to use the Jacks I have?

It won't blow anything up. But hell, I don't know whether it would ultimately be quieter or nosier, or make no difference. Right now, because the box is plastic, the shields of the 3 in/out pairs are isolated from each other. You can try the metal box with the jacks you have. If it's still noisy, you can pick up some of those plastic jacks to try and see if isolating the shields makes any difference. They are maybe 50 cents each.

[Coma]

Re: DIY patch bay ground noise

It won't blow anything up. But hell, I don't know whether it would ultimately be quieter or nosier, or make no difference. Right now, because the box is plastic, the shields of the 3 in/out pairs are isolated from each other. You can try the metal box with the jacks you have. If it's still noisy, you can pick up some of those plastic jacks to try and see if isolating the shields makes any difference. They are maybe 50 cents each.

Heh, well, surprise suprise, that was the plan [emoji6]

[Gtrjunior]

Re: DIY patch bay ground noise

Yeah, I've seen those used in some boxes. Then again half the other ones I've seen haven't. I'm finding it difficult to suss out what is the proper way to do it.

Put it this way: this box will cover connections to preamp, then FX loop send and return. With everything connected with shared ground, will this be a problem? Is there any reason NOT to use the Jacks I have?

I have a patch box that somebody built for me. I believe has isolated jacks. If you are still having issues with this, I’ll gladly open it up and snap some pics so we can see how it was done. I have zero issues with this box. I’m using it to run lines to the Fx loop and front of amp, iirc.
(I’m using this on my small setup and I haven’t actually set it up in several months.)

[Coma]

Re: DIY patch bay ground noise

I have a patch box that somebody built for me. I believe has isolated jacks. If you are still having issues with this, I’ll gladly open it up and snap some pics so we can see how it was done. I have zero issues with this box. I’m using it to run lines to the Fx loop and front of amp, iirc.
(I’m using this on my small setup and I haven’t actually set it up in several months.)

Would love a picture thanks [emoji106]

[Gtrjunior]

Re: DIY patch bay ground noise

Would love a picture thanks [emoji106]

You got it.
I’m hoping I’ll have a couple of minutes before rehearsal tonite to do it.

[Gtrjunior]

Re: DIY patch bay ground noise

Ok, so this is just a box for running to my Fx loop. 2 ins and 2 outs. Hopefully you’re able to see what you need.
It’s metal enclosure.

[devastone]

Re: DIY patch bay ground noise

In the pic above, those metal jacks are all grounded together through the box, as it should be.

A metal box will provide some shielding and also ground the "grounds" (rings) together, which is probably what you want. OP, what exactly are you using this patch bay for?

[Coma]

Re: DIY patch bay ground noise

In the pic above, those metal jacks are all grounded together through the box, as it should be.

A metal box will provide some shielding and also ground the "grounds" (rings) together, which is probably what you want. OP, what exactly are you using this patch bay for?

The idea is to run cables from pedal board to front of amp, then FX loop to and back from pedal board.

Im just trying to figure out if I'll have any issues with ground loops. Esp seeing as how my NS2 is connected in X pattern, so it's already both in front of and in the loop.

[devastone]

Re: DIY patch bay ground noise

By isolating them you may be creating ground noise, and yes, the grounds are all connected in the NS-2.

FWIW, I have had noise issues from sharing a power supply on pedals in front of the amp and pedals in the loop, the solution was to use separate power supplies or different outputs on a brick with truly isolated supplies for fx in front and in the loop. Not sure what would happen with the NS-2, I wasn't using one then. (FWIW that is one of my favorite noise suppressors)

[Coma]

Re: DIY patch bay ground noise

By isolating them you may be creating ground noise, and yes, the grounds are all connected in the NS-2.

FWIW, I have had noise issues from sharing a power supply on pedals in front of the amp and pedals in the loop, the solution was to use separate power supplies or different outputs on a brick with truly isolated supplies for fx in front and in the loop. Not sure what would happen with the NS-2, I wasn't using one then. (FWIW that is one of my favorite noise suppressors)

Currently, I've had no issues with noise in my setup. I'm just not sure if having all cables connected trough the one patch pay, as opposed to my previous setup with three 5 meter cables running to and from the amp will be a problem. What's really making me confused is a lot of sources say different things regarding the need for using isolated or non-isolated jacks.

Stinkfoot, for instance, recommends using one properly grounded jack and then isolated plastic ones for the rest of the box.