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Attaching Shield to "Lo"/Ground Wire at Intercom

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nuckollsr(at)cox.net
Guest

Posted: Mon Feb 12, 2007 8:27 am Post subject: Attaching Shield to "Lo"/Ground Wire at Intercom

At 11:10 AM 2/12/2007 -0500, you wrote:



 	  Quote: 	
		  I'm in the same situation.  Bob had given me a link at one time for this, 

but I can't find it.  Also can't find anything in the articles on Bob's 

web site.  Please let me know if you get a response to this.



Thanks very much..



Do not archive



Bill Steer


	


http://aeroelectric.com/articles/pigtail/pigtail.html

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nuckollsr(at)cox.net
Guest

Posted: Mon Feb 12, 2007 8:34 am Post subject: Attaching Shield to "Lo"/Ground Wire at Intercom

At 08:44 PM 2/10/2007 -0600, you wrote:



 	  Quote: 	
		  The installation instructions for my PS Engineering PM1000II intercom show 

all shields for the mics and phones grounded to their corresponding "Lo" 

wires.  I've looked at Bob's comic books and searched the collection of 

FAQs and couldn't find a way to do it.  The wires will be crimped onto 

D-SUB pins so there is only room for one wire.



(For intercom installation wiring diagram, 

see 

<http://www.ps-engineering.com/docs/pm1000wiring_data.shtml>http://www.ps-engineering.com/docs/pm1000wiring_data.shtml)



Can I "daisy chain" the shields as Bob shows in his "Shield Termination 

Techniques" comic book and ground them all to Ground Pin 1 (which goes to 

the "forest-of-tabs" ground block) rather than at each individual "Lo" 

wire pin?



Or should each shield be individually grounded to its corresponding "Lo" 

wire?  It seems I could create an uninsulated length (~0.3 in) before the 

end of the "Lo" wire and lightly solder the shield directly to the "Lo" 

wire, cover it with heatshrink and then crimp my D-Sub pin to the end of 

the "Lo" wire and insert it into the connector.


	


    The diagram cited at:



http://aeroelectric.com/articles/pigtail/pigtail.html



    is pretty busy. Virtually all of the shielded wires

    depicted can be reduced by one conductor inside the

    shield by using the shield as a signal conductor. For

    example, the AUX Headphone jack wired to pins 17 and

    4 can be handled on a single shielded wire. Use the

    shield to provide continuity from pin 4 to the LO side

    of the headphone jack.



    This philosophy is illustrated in the wiring diagram

    pages of:



http://www.aeroelectric.com/DIY/Audio_Isolation_Amplifier.pdf



    See:



http://aeroelectric.com/articles/pigtail/pigtail.html



    for techniques used to attach one or more shields

    into a single wire and termination into a connector

    pin.



    Bob . . .



        ----------------------------------------

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

        ----------------------------------------

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