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Audio isolation amp questions

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dhyde01(at)earthlink.net
Guest

Posted: Wed Dec 19, 2007 4:38 pm Post subject: Audio isolation amp questions

I've ordered the audio amp PCB from AEC but have a few questions based on reading rev J of the writeup.

I'd like to use this board to sum 3-4 mono inouts and two stereo inputs.  At the most basic level I understand 

the function of the board but get a little confused looking at the schematic.  On the stereo schematic, page 1.7,

both inputs to the left signal amp (LM316) are labelled pin 3.  Is the upper pin #2 and the lower #3 or vice versa?

Which leads to......

On the diagram where additional inputs are shown (p 1.8.1), am I correct in assuming that an additional stereo input 

could be added by adding appropriate resistor/capacitor networks (and dummy load as required) into pin 3 of both amps 

(or pins 3 right and 2 left depending on the answer above)?



Or maybe the first question should be:  Is rev J the most current version?



Thanks in advance,



Dave 'Nauga' Hyde

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nuckolls.bob(at)cox.net
Guest

Posted: Wed Dec 19, 2007 8:50 pm Post subject: Audio isolation amp questions

At 04:37 PM 12/19/2007 -0800, you wrote:



 	  Quote: 	
		  

<dhyde01(at)earthlink.net>



I've ordered the audio amp PCB from AEC but have a few questions based on 

reading rev J of the writeup.

I'd like to use this board to sum 3-4 mono inouts and two stereo 

inputs.  At the most basic level I understand

the function of the board but get a little confused looking at the 

schematic.  On the stereo schematic, page 1.7,

both inputs to the left signal amp (LM316) are labelled pin 3.  Is the 

upper pin #2 and the lower #3 or vice versa?

Which leads to......

On the diagram where additional inputs are shown (p 1.8.1), am I correct 

in assuming that an additional stereo input

could be added by adding appropriate resistor/capacitor networks (and 

dummy load as required) into pin 3 of both amps

(or pins 3 right and 2 left depending on the answer above)?



Or maybe the first question should be:  Is rev J the most current version?


	


   No, I've updated one page of the data package to correct

   the issues you've cited . . . and added a parts layout

   view for the ECB you purchased (I still need to find

   them . . . they're around here somewhere!). See:



http://www.aeroelectric.com/DIY/Audio_Iso_P1p7_K.pdf



   The whole data package needs some attention with

   respect to obsolete parts on Digikey but don't

   have time right now. Your interpretation of what's

   needed to add more inputs is, I believe, correct.



   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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dhyde01(at)earthlink.net
Guest

Posted: Thu Dec 20, 2007 2:26 pm Post subject: Audio isolation amp questions

Thanks for the response, Bob.  I did a little more thorough search of the archives and found answers to everything in there (don't know why I couldn't find them for the past few days), but thanks for taking the time anyway.



Dave Hyde

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