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Audio panel #inputs vs #sources

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recapen(at)earthlink.net
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Posted: Wed Jan 09, 2008 9:00 am Post subject: Audio panel #inputs vs #sources

Folks,



I have three inputs that should be 'unswitched':

AOA warning

Traffic Alert

AF3400EM Engine monitor



My audio panel (PS Engineering PMA7000MS) has two unswitched inputs.

Can I tie two of the sources to one input?  I think there would only be an issue if they both went off at teh same time.

Alternatively, I can put the third to a switched input and leave the switch on.



Thanks,

Ralph

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nuckolls.bob(at)cox.net
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Posted: Thu Jan 10, 2008 6:12 pm Post subject: Audio panel #inputs vs #sources

At 11:16 AM 1/9/2008 -0500, you wrote:



 	  Quote: 	
		  

<recapen(at)earthlink.net>



Folks,



I have three inputs that should be 'unswitched':

AOA warning

Traffic Alert

AF3400EM Engine monitor



My audio panel (PS Engineering PMA7000MS) has two unswitched inputs.

Can I tie two of the sources to one input?  I think there would only be an 

issue if they both went off at teh same time.

Alternatively, I can put the third to a switched input and leave the 

switch on.


	


   Put 100 ohm resistors in series with EACH of the three output

   before bringing them together whether switched or not.  See:



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



   Bob . . .

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recapen(at)earthlink.net
Guest

Posted: Fri Jan 11, 2008 5:14 am Post subject: Audio panel #inputs vs #sources

Bob,



I have heard 100ohm, 470ohm, and 510ohm.  I'm guessing that either will function properly and that the 470 and 510's will decrease the volume more in addition to preventing the backfeed.



Ralph



--

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nuckolls.bob(at)cox.net
Guest

Posted: Fri Jan 11, 2008 7:48 am Post subject: Audio panel #inputs vs #sources

At 08:13 AM 1/11/2008 -0500, you wrote:



 	  Quote: 	
		  

<recapen(at)earthlink.net>



Bob,



I have heard 100ohm, 470ohm, and 510ohm.  I'm guessing that either will 

function properly and that the 470 and 510's will decrease the volume more 

in addition to preventing the backfeed.



Ralph


	


   Astute supposition sir.



   Bob . . .    ----------------------------------------)



        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

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recapen(at)earthlink.net
Guest

Posted: Fri Jan 11, 2008 8:30 am Post subject: Audio panel #inputs vs #sources

Thanks - occasionally, I have an active brain cell or two.....



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nuckolls.bob(at)cox.net
Guest

Posted: Mon Jan 14, 2008 4:47 pm Post subject: Audio panel #inputs vs #sources

At 11:38 AM 1/14/2008 -0500, you wrote:



 	  Quote: 	
		  

<recapen(at)earthlink.net>



Will 1/4 watt be sufficient?


	


  Yes or even 1/2 watt. I often use 'oversized'

  components just to get mechanically more robust

  devices. This is one case where electrical ratings

  take a back seat being big, mean and ugly.



  Bob . . .

[quote]--

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