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Audio Shields

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dsvs(at)ca.rr.com
Guest

Posted: Fri Jan 12, 2007 1:34 pm Post subject: Audio Shields

Bob and other listers,



I have several audio devices that will have to share one input to my audio panel.  I understand the wiring and installation of resistors but the shields have my not sure of the best way to do the install.  I am using d-sub connectors mid way between the devices and the audio panel to install the resistors so that I can easily remove and change the values if needed to adjust individual volumes.  



The shield on one device is connected (by the manufacturer at the device end the others say connect at the audio panel.  I understand the ground loop problem with connecting at each end.     The question is, Is it a good practice to shield the device side terminated at the device but not at the d-sub and the audio panel side terminated at the audio panel but not at the d-sub.  This would cover most of the wire except the d-sub in the middle of the run and still not lead to a ground loop.  Am I understand the idea correctly?  If not I would appreciate a little help with this.  Thanks in advance.  Don

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dsvs(at)ca.rr.com
Guest

Posted: Fri Jan 12, 2007 1:35 pm Post subject: Audio Shields

Bob and other listers,



I have several audio devices that will have to share one input to my audio panel.  I understand the wiring and installation of resistors but the shields have my not sure of the best way to do the install.  I am using d-sub connectors mid way between the devices and the audio panel to install the resistors so that I can easily remove and change the values if needed to adjust individual volumes.  



The shield on one device is connected (by the manufacturer at the device end the others say connect at the audio panel.  I understand the ground loop problem with connecting at each end.     The question is, Is it a good practice to shield the device side terminated at the device but not at the d-sub and the audio panel side terminated at the audio panel but not at the d-sub.  This would cover most of the wire except the d-sub in the middle of the run and still not lead to a ground loop.  Am I understand the idea correctly?  If not I would appreciate a little help with this.  Thanks in advance.  Don

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nuckollsr(at)cox.net
Guest

Posted: Fri Jan 12, 2007 2:54 pm Post subject: Audio Shields

At 01:27 PM 1/12/2007 -0800, you wrote:



 	  Quote: 	
		  



Bob and other listers,



I have several audio devices that will have to share one input to my audio 

panel.  I understand the wiring and installation of resistors but the 

shields have my not sure of the best way to do the install.  I am using 

d-sub connectors mid way between the devices and the audio panel to 

install the resistors so that I can easily remove and change the values if 

needed to adjust individual volumes.



The shield on one device is connected (by the manufacturer at the device 

end the others say connect at the audio panel.  I understand the ground 

loop problem with connecting at each end.     The question is, Is it a 

good practice to shield the device side terminated at the device but not 

at the d-sub and the audio panel side terminated at the audio panel but 

not at the d-sub.  This would cover most of the wire except the d-sub in 

the middle of the run and still not lead to a ground loop.  Am I 

understand the idea correctly?  If not I would appreciate a little help 

with this.  Thanks in advance.  Don


	




    With all your goodies co-located on the panel, it probably

    doesn't matter if you ground at one end or both . . . and given

    the relatively short leads, all the wiring could probably be done

    with no shielding whatsoever!



    The latest addition to the AeroElectric Connection is a chapter

    on audio systems which you're free to download at:



http://aeroelectric.com/articles/Rev11/18Audio_R11.pdf



    It speaks to the simple "resistor mixing" technique

    you've cited . . . and also illustrates various combinations

    of intercoms, audio isolation amplifiers and audio sources.

    I think you'll find enough information in this document

    to proceed with your installation.



    Bob . . .

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

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

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

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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dsvs(at)ca.rr.com
Guest

Posted: Fri Jan 12, 2007 3:04 pm Post subject: Audio Shields

Bob,

Thanks for the reply.  I read the new chapter last night.  The only thing that I was not sure about was the shields.  I will give it a shot with no shields attached.  Don

---- "Robert L. Nuckolls wrote: 

 	  Quote: 	
		   

 

 At 01:27 PM 1/12/2007 -0800, you wrote:

 

 >

 >

 >Bob and other listers,

 >

 >I have several audio devices that will have to share one input to my audio 

 >panel.  I understand the wiring and installation of resistors but the 

 >shields have my not sure of the best way to do the install.  I am using 

 >d-sub connectors mid way between the devices and the audio panel to 

 >install the resistors so that I can easily remove and change the values if 

 >needed to adjust individual volumes.

 >

 >The shield on one device is connected (by the manufacturer at the device 

 >end the others say connect at the audio panel.  I understand the ground 

 >loop problem with connecting at each end.     The question is, Is it a 

 >good practice to shield the device side terminated at the device but not 

 >at the d-sub and the audio panel side terminated at the audio panel but 

 >not at the d-sub.  This would cover most of the wire except the d-sub in 

 >the middle of the run and still not lead to a ground loop.  Am I 

 >understand the idea correctly?  If not I would appreciate a little help 

 >with this.  Thanks in advance.  Don

 

 

     With all your goodies co-located on the panel, it probably

     doesn't matter if you ground at one end or both . . . and given

     the relatively short leads, all the wiring could probably be done

     with no shielding whatsoever!

 

     The latest addition to the AeroElectric Connection is a chapter

     on audio systems which you're free to download at:

 

 http://aeroelectric.com/articles/Rev11/18Audio_R11.pdf

 

     It speaks to the simple "resistor mixing" technique

     you've cited . . . and also illustrates various combinations

     of intercoms, audio isolation amplifiers and audio sources.

     I think you'll find enough information in this document

     to proceed with your installation.

 

     Bob . . .

 

 

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

       < What is so wonderful about scientific truth...is that >

       < the authority which determines whether there can be   >

       < debate or not does not reside in some fraternity of   >

       < scientists; nor is it divine. The authority rests     >

       < with experiment.                                      >

       <                            --Lawrence M. Krauss       >

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

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

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