DIY patch bay ground noise

[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

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

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]

[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

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

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

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

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

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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[DavidRavenMoon]

DIY patch bay ground noise

Shielded wire. Inner conductor and outer braided shield, covered by black tubing.

What does rubbing coax mean?

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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.


Sent from my iPhone using Tapatalk

[Coma]

Re: DIY patch bay ground noise

How would a plastic case make grounding easier? In a metal enclosure the case becomes ground and shields your wires.

And how are the cables shielded? I see two wires on each jack. On a shielded cable you have the ground and the signal wire. The shield is the ground.

Are you rubbing coax without the shields grounded? That will produce hum.


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Shielded wire. Inner conductor and outer braided shield, covered by black tubing.

What does rubbing coax mean?

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[DavidRavenMoon]

Re: DIY patch bay ground noise

Casing is plastic, as I figured that would make grounding easier. Anything I've missed? Just ****ty components? All cables in it are shielded.

How would a plastic case make grounding easier? In a metal enclosure the case becomes ground and shields your wires.

And how are the cables shielded? I see two wires on each jack. On a shielded cable you have the ground and the signal wire. The shield is the ground.

Are you rubbing coax without the shields grounded? That will produce hum.


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[Hank-]

Re: DIY patch bay ground noise

I meant like the grounds are coneected like this:
Send in > Send out
Return in> Return out
Amp in> amp out

Wait dont answer that, its obvious from the pics lol

[Coma]

Re: DIY patch bay ground noise

Are the grounds on input/output connected to eachother?
Also amp & pedalboard is on the same mains outlet?

Not sure what you mean. Yes, the grounds on each pair are connected, but no if you mean each pair shares a joint ground. The latter seemed pointless to me, as they're basically supposed to function as cable extensions anyway.

Haven't tried it with the rest of the pedal board yet. So far I've only connected guitar through one port at a time and then directly to amp.

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[Hank-]

Re: DIY patch bay ground noise

Are the grounds on input/output connected to eachother?
Also amp & pedalboard is on the same mains outlet?