-10 on dsub

[RICK FITZPATRICK]

Hello, I would like to build some modules for interfacing my console/mixer/patchbays etc. I have seen the rear of foh consoles where custom elko or dsub(larger)type conecctors/jacks have been installed into the anvil cases, for mic and line level snakes etc. I have never worked with these type of connectors before, although I have a nasa soldering certificate, and have built cables with dsubs. My question is, when the signals require shielded grounds, what do you do with the shields inside the plug, jacks. Do they use their own pin, or do you commonize all the grounds to one pin. Or do you purchase multisignal plugs and jacks that have pins with a shield around them, as an RCA has.. I've never had the opportunity to look at one of these. I thought if the shield were interupted, that would compromise the shield. Enlightenment on this is appreciated mucho.
fitz

 

[Peter Maydew]

Good electronic practice would suggest that protective ground should be separated from signal ground(s).

So the overall screen of your multiway would connect through the body of your connector - when dealing with 'D' types, this usually requires a metal or metallized plastic backshell, and you should also use the "tinned and dimpled" variety rather than the yellow passivated connector bodies which have worse contact resistance.

Signal grounds would then be routed through pins - preferably one pin per ground if you can manage it, certainly separating high level signal grounds from low level signal grounds if not.

This should give you the best interference rejection, crosstalk etc.

 

[RICK FITZPATRICK]

Thankyou sir.