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D-sub questions

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rparigoris

Joined: 24 Nov 2009
Posts: 796

Posted: Wed May 05, 2010 9:46 am Post subject: D-sub questions

Hi Group



I have a few questions about D-sub connectors:



**How many amps are each pin good for using the nice machined pins?



**How many amps are each pin good for using solder on pins? 



**I want to run my Ray Allen pitch and roll servo wiring through D-sub connector. Would it be advisable, especially on the pitch to parallel two pins?



**I need to run 4 shielded wires out on my instrument module (2ea. mic and speaker). I would like to use a D-sub connector on the bottom port side of my instrument module to allow easier instrument module removal and install. Thus there will be a few inches of unshielded wires at the connector:

$$Should I use D-sub shielded shells? This D-sub connector is about 5" away from my Dynon D-10A



**I have a single point ground on firewall with field of tabs. I think I remember seeing for avionics and instruments (can't find it) a D-sub connector with perhaps 3 or 4 wires going to field of tabs, and all the pins connected to one side to those 3 or 4 wires to make a field of pins to be used for single point ground. Is this acceptable for grounding on the same connector:

$$mic and speaker shield?

$$Radio and transponder grounds?

$$Instrument grounds?



Thx.

Ron Parigoris

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed May 05, 2010 7:41 pm Post subject: D-sub questions

At 12:46 PM 5/5/2010, you wrote:

 	  Quote: 	
		  

<rparigor(at)suffolk.lib.ny.us>



Hi Group



I have a few questions about D-sub connectors:



**How many amps are each pin good for using the nice machined pins?


	


   The continuous rating for individual pins is 7A



 	  Quote: 	
		  **How many amps are each pin good for using solder on pins?


	


   Same . . .



   You can run a LOT of current through a D-sub connector. See:



http://www.aeroelectric.com/Pictures/Connectors/D-Subminature/Paralleled_D-Sub_Pins.jpg



   I used this technique to run 20+ amps through D-subs on

   this vehicle's . . .



http://aeroelectric.com/Pictures/Misc/GQM_1st_Ops_Flight.jpg

   DC power distribution assembly . . .



http://aeroelectric.com/Pictures/Misc/GQM_Power_Dist.jpg



   which featured solid state switching. In this application,

   we de-rated pins to 4A each and paralleled 5 pins for

   the 20A conductors. The de-rating was in recognition of

   our 70C max operating environment.



 	  Quote: 	
		  **I want to run my Ray Allen pitch and roll servo wiring through 

D-sub connector. Would it be advisable, especially on the pitch to 

parallel two pins?


	


    Can't think of a good reason why.

 	  Quote: 	
		  **I need to run 4 shielded wires out on my instrument module (2ea. 

mic and speaker). I would like to use a D-sub connector on the 

bottom port side of my instrument module to allow easier instrument 

module removal and install. Thus there will be a few inches of 

unshielded wires at the connector:


	


 	  Quote: 	
		  $$Should I use D-sub shielded shells? This D-sub connector is about 

5" away from my Dynon D-10A


	


   No, take shields through the connectors on their

   own pins. Actually, these signals can be carried

   very nicely on twisted pairs and/or trios with

   no shielding but if you choose to shield, treat

   the shields as separate conductors.



 	  Quote: 	
		  **I have a single point ground on firewall with field of tabs. I 

think I remember seeing for avionics and instruments (can't find it) 

a D-sub connector with perhaps 3 or 4 wires going to field of tabs, 

and all the pins connected to one side to those 3 or 4 wires to make 

a field of pins to be used for single point ground. Is this 

acceptable for grounding on the same connector:


	


 	  Quote: 	
		  $$mic and speaker shield?

$$Radio and transponder grounds?

$$Instrument grounds?


	


   FOLLOW THE WIRING DIAGRAM FOR THE PRODUCTS YOU

   ARE INSTALLING.



   Shields on wires that run between black boxes

   GENERALLY terminate on either some specific pin

   in a connector or the connector's back-shell.

   They NEVER get long pigtails off to some remote

   ground location.



   The grounding configurations shown in Appendix Z

   are for accessory power grounds, not system signal

   or shield grounds.



   Bob . . .

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