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DIY patch bay ground noise

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  • #16
    Re: DIY patch bay ground noise

    Originally posted by DavidRavenMoon View Post
    That was ďrunningĒ 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
    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.

    Skickat frŚn min SM-G955F via Tapatalk
    --------------------------------------------------------
    1973 Aria 551
    1984 Larrivee RS-4 w/ EMG SA/SA/89
    1989 Charvel 750 XL w/ DMZ Tone Zone & Air Norton
    1990's noname crap-o-caster plywood P/J Bass
    1991 Heartfield Elan III w/ DMZ mystery pups
    1995 Aria Pro II TA-65
    2001 Gibson Les Paul Gothic w/ PG-1 & SH-8

    Comment


    • #17
      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.

      Comment


      • #18
        Re: DIY patch bay ground noise

        Originally posted by Darg1911 View Post
        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?
        --------------------------------------------------------
        1973 Aria 551
        1984 Larrivee RS-4 w/ EMG SA/SA/89
        1989 Charvel 750 XL w/ DMZ Tone Zone & Air Norton
        1990's noname crap-o-caster plywood P/J Bass
        1991 Heartfield Elan III w/ DMZ mystery pups
        1995 Aria Pro II TA-65
        2001 Gibson Les Paul Gothic w/ PG-1 & SH-8

        Comment


        • #19
          Re: DIY patch bay ground noise

          Originally posted by Coma View Post
          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

          Comment


          • #20
            Re: DIY patch bay ground noise

            Originally posted by Darg1911 View Post
            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?
            --------------------------------------------------------
            1973 Aria 551
            1984 Larrivee RS-4 w/ EMG SA/SA/89
            1989 Charvel 750 XL w/ DMZ Tone Zone & Air Norton
            1990's noname crap-o-caster plywood P/J Bass
            1991 Heartfield Elan III w/ DMZ mystery pups
            1995 Aria Pro II TA-65
            2001 Gibson Les Paul Gothic w/ PG-1 & SH-8

            Comment


            • #21
              Re: DIY patch bay ground noise

              Originally posted by Coma View Post
              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.

              Comment


              • #22
                Re: DIY patch bay ground noise

                Originally posted by Darg1911 View Post
                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]
                --------------------------------------------------------
                1973 Aria 551
                1984 Larrivee RS-4 w/ EMG SA/SA/89
                1989 Charvel 750 XL w/ DMZ Tone Zone & Air Norton
                1990's noname crap-o-caster plywood P/J Bass
                1991 Heartfield Elan III w/ DMZ mystery pups
                1995 Aria Pro II TA-65
                2001 Gibson Les Paul Gothic w/ PG-1 & SH-8

                Comment


                • #23
                  Re: DIY patch bay ground noise

                  Originally posted by Coma View Post
                  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, Iíll gladly open it up and snap some pics so we can see how it was done. I have zero issues with this box. Iím using it to run lines to the Fx loop and front of amp, iirc.
                  (Iím using this on my small setup and I havenít actually set it up in several months.)

                  Comment


                  • #24
                    Re: DIY patch bay ground noise

                    Originally posted by Gtrjunior View Post
                    I have a patch box that somebody built for me. I believe has isolated jacks. If you are still having issues with this, Iíll gladly open it up and snap some pics so we can see how it was done. I have zero issues with this box. Iím using it to run lines to the Fx loop and front of amp, iirc.
                    (Iím using this on my small setup and I havenít actually set it up in several months.)
                    Would love a picture thanks [emoji106]
                    --------------------------------------------------------
                    1973 Aria 551
                    1984 Larrivee RS-4 w/ EMG SA/SA/89
                    1989 Charvel 750 XL w/ DMZ Tone Zone & Air Norton
                    1990's noname crap-o-caster plywood P/J Bass
                    1991 Heartfield Elan III w/ DMZ mystery pups
                    1995 Aria Pro II TA-65
                    2001 Gibson Les Paul Gothic w/ PG-1 & SH-8

                    Comment


                    • #25
                      Re: DIY patch bay ground noise

                      Originally posted by Coma View Post
                      Would love a picture thanks [emoji106]
                      You got it.
                      Iím hoping Iíll have a couple of minutes before rehearsal tonite to do it.

                      Comment


                      • #26
                        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 youíre able to see what you need.
                        Itís metal enclosure.

                        Comment


                        • #27
                          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?

                          Comment


                          • #28
                            Re: DIY patch bay ground noise

                            Originally posted by devastone View Post
                            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.
                            --------------------------------------------------------
                            1973 Aria 551
                            1984 Larrivee RS-4 w/ EMG SA/SA/89
                            1989 Charvel 750 XL w/ DMZ Tone Zone & Air Norton
                            1990's noname crap-o-caster plywood P/J Bass
                            1991 Heartfield Elan III w/ DMZ mystery pups
                            1995 Aria Pro II TA-65
                            2001 Gibson Les Paul Gothic w/ PG-1 & SH-8

                            Comment


                            • #29
                              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)

                              Comment


                              • #30
                                Re: DIY patch bay ground noise

                                Originally posted by devastone View Post
                                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.
                                --------------------------------------------------------
                                1973 Aria 551
                                1984 Larrivee RS-4 w/ EMG SA/SA/89
                                1989 Charvel 750 XL w/ DMZ Tone Zone & Air Norton
                                1990's noname crap-o-caster plywood P/J Bass
                                1991 Heartfield Elan III w/ DMZ mystery pups
                                1995 Aria Pro II TA-65
                                2001 Gibson Les Paul Gothic w/ PG-1 & SH-8

                                Comment

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