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electrical plug

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mdnanwelch7(at)hotmail.co
Guest

Posted: Sun Oct 24, 2010 8:14 am Post subject: electrical plug

List members,

 

  I'm in the process of wiring all the instruments and electrical goodies for my plane.

I have two areas where all the electrical items are located; an overhead panel & my 

front panel/console.

  The overhead panel has the ignition switch, various light switches, all circuit breakers,

etc. (the power supply center)   The front panel/console has the Icom A200 com radio, 

 King transponder, Dynon D10A, Garmin 296, airspeed and vert. climb, and various engine 

 gages.

 

  Here's what I'm after;  what would be a standard, recommended male/female plug

combination to send the electrical power from the overhead panel to the front panel?

 

  I have considered the DB9 plug, but I don't know if it could handle the 5 amps (max)

of the Icom or the King KT76.  I don't think any of the other devices would be a problem

for the DB9, it's just the Icom A200 and the transponder I'm concerned with.

  I looked on Digi-key, but it is difficult to know where to begin.  With 40,000 plugs, I can't see

 the forest for the trees.

  

   I think the best would be a robust, say...12 pin, locking Molex m/f plug and recepticle,

 typically like a standard automotive wiring harness connection.  Something like this, but in 

 wiring harness style;

  

 http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=WM1684-ND

  

 Thanks for any guidance,    Mike Welch

  



 		 	   		    [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Oct 24, 2010 10:12 am Post subject: electrical plug

 	  Quote: 	
		  

  

   I think the best would be a robust, say...12 pin, locking Molex m/f plug and recepticle,

 typically like a standard automotive wiring harness connection.  Something like this, but in 

 wiring harness style;

  

  http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=WM1684-ND 

  	


   Those would work but they ARE sheet metal pins. You can

   parallel pins in a D-sub to share loads. If the vast majority

   of your circuits are d-sub friendly, then perhaps you'd need

   only to beef up a few pathways in the connector. See:



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

 

 

 

   Bob . . .    [quote][b]

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mdnanwelch7(at)hotmail.co
Guest

Posted: Sun Oct 24, 2010 10:50 am Post subject: electrical plug

 Bob,

  

   Thanks for the help.  Your suggestion of sharing pins is a good one.  I hadn't considered

 that.  Will a DB9 plug/receptacle handle 3A per pin?  If so, I think this could be a simple

 answer, because I only need to double up just a couple of pins.

  

 Thanks,   Mike

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mdnanwelch7(at)hotmail.co
Guest

Posted: Sun Oct 24, 2010 2:57 pm Post subject: electrical plug

> Will a DB9 plug/receptacle handle 3A per pin?  

  

 Bob,

  

   To answer my own question, I did some research on DB15 plugs, and yes, they

 appear to be able 5A per pin, according to one manufacturer.

  

   I think I'll go with the DB9, and combine two pins for the Icom and the King transponder.

 The rest of the pins should be just fine!

  

 Thanks again, Bob





 		 	   		    [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Oct 24, 2010 5:38 pm Post subject: electrical plug

At 05:52 PM 10/24/2010, you wrote:

  	  Quote: 	
		  > Will a DB9 plug/receptacle handle 3A per pin?  

  

 Bob,

  

   To answer my own question, I did some research on DB15 plugs, and yes, they

 appear to be able 5A per pin, according to one manufacturer.

  

   I think I'll go with the DB9, and combine two pins for the Icom and the King transponder.

 The rest of the pins should be just fine! 	


    Do grounds go through this connector too?

    They need to be as robust as the power

    feeder pins. Also, it's common practice with

    any new design to have spare pins in any

    connector to allow for future expansion

    without having to re-wire a connector.

    We used to shoot for 15 to 20% spares.

    Suggest you consider a larger connector

    especially if you need to add grounds too.



    Bob . . .    [quote][b]

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mdnanwelch7(at)hotmail.co
Guest

Posted: Sun Oct 24, 2010 8:44 pm Post subject: electrical plug

  

 > I think I'll go with the DB9, and combine two pins for the Icom and the King transponder.



  > Do grounds go through this connector too?

  > They need to be as robust as the power

  > feeder pins. Also, it's common practice with

   >any new design to have spare pins in any

   >connector to allow for future expansion

   >without having to re-wire a connector.

   >We used to shoot for 15 to 20% spares.

   >Suggest you consider a larger connector

   >especially if you need to add grounds too.



  > Bob . . . 

 

Hi Bob,

 

  Yes, I plan on running the ground thru the DB connector.  I was going to allocate 

 four pins to supply the ground connection for the front panel.  My plan is the main ground 

 wire be #12AWG, leading down to the 4-way split to the (4ea) #16AWG soldered to each pin.  

 The recepticle connector then gets the same treatment for ground, i.e.(4ea) #16AWG back to 

 #12AWG, with the ground wire terminating at a buss bar.

 

  Since I mentioned DB9 earlier, I just left that plug in the conversation.  The fact is, after 

 counting and leaving a couple of pins as spares, I am actually getting a DB15.

 

The pin allocation was planned to be this;

  

After using two pins each for the Icom and the King transponder, one each for the Dynon and 

 Garmin 296, and four for the ground, this makes ten pins so far.  Using one pin to light the 

 instrument lights, and one for some super tiny current drawers (like the Dynon alarm circuit 

 you drew for me), I'm left with at least three spares.  I could even include the Dynon alarm 

 power in with the instrument lights, and be left with 4 extra pins.

 

  Thanks for your help, Bob.

 

Mike Welch



[quote]



[b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Oct 27, 2010 1:14 pm Post subject: electrical plug

At 11:38 PM 10/24/2010, you wrote:

  	  Quote: 	

  > I think I'll go with the DB9, and combine two pins for the Icom and the King transponder.

   > Do grounds go through this connector too?

   > They need to be as robust as the power

   > feeder pins. Also, it's common practice with

    >any new design to have spare pins in any

    >connector to allow for future expansion

    >without having to re-wire a connector.

    >We used to shoot for 15 to 20% spares.

    >Suggest you consider a larger connector

    >especially if you need to add grounds too.

   > Bob . . . 

 Hi Bob,

   Yes, I plan on running the ground thru the DB connector.  I was going to allocate 

 four pins to supply the ground connection for the front panel.  My plan is the main ground 

 wire be #12AWG, leading down to the 4-way split to the (4ea) #16AWG soldered to each pin.  

 The recepticle connector then gets the same treatment for ground, i.e.(4ea) #16AWG back to 

 #12AWG, with the ground wire terminating at a buss bar. 	

   ???? Dsub pins are designed for 20AWG max. Suggest you carry

   the four ground pins all the way on 20AWG. Use two for one

   radio, two for the other..

  	  Quote: 	

   Since I mentioned DB9 earlier, I just left that plug in the conversation.  The fact is, after 

 counting and leaving a couple of pins as spares, I am actually getting a DB15.

 The pin allocation was planned to be this;

 After using two pins each for the Icom and the King transponder, one each for the Dynon and 

 Garmin 296, and four for the ground, this makes ten pins so far.  Using one pin to light the 

 instrument lights, and one for some super tiny current drawers (like the Dynon alarm circuit 

 you drew for me), I'm left with at least three spares.  I could even include the Dynon alarm 

 power in with the instrument lights, and be left with 4 extra pins. 	

   Bob . . .    [quote][b]

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