I'm building a mic. preamp and will use Neutrik NCJ6FA type socket.
Pin 1 is the shield, electromagnetically it's an extension of the chassis, so this must connect to the metal chassis
Pin 2 and 3 are a balanced pair.
Any ideas what G pin signifies in the above?
I seems to align with the bottom right screw hole, so I am guess that it is helpful way being able to connect the shield of the incoming cable to the chassis at the point of entry by connecting if pin 1 and pin G on the PCB. Or alternatively, the connection between pin 1 and pin G could be controlled by a switch for a ground lift feature.
Given this is already a topic that causes a huge amount of confusion, it would have been good if Neutrik published an App. note.
It's for attaching the cable shield to the shell and the shell to the chassis.
It's fine for component to component interconnect cables.
But Audio Engineering Society standard AES 54 prohibits attaching cable shields to the shell on portable extension cables where a shell might come in contact with metal objects at a different potential.
It's fine for component to component interconnect cables.
But Audio Engineering Society standard AES 54 prohibits attaching cable shields to the shell on portable extension cables where a shell might come in contact with metal objects at a different potential.
G is a separate isolated contact for the XLR shell that also connects to the metal front plate. Since the latter is a "dent/scratch" contact, it is rather unreliable and not very effective a RF anyway, not being a 360 contact. Only XLR jacks with metal flange do that right, but alas no XLR/TRS combo variant is available. And the cable connector should be from the EMC range.
That's for cable-mounted connectors and it refers to a low-ohmic connection. Capacitive connect is ok, like Neutrik does with the EMC variants.
Device-side connectors should connect shell and shield to the metal chassis in the best possible way, using the full metal housing types (DLX series).