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496 Audio

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Dave(at)AirCraftersLLC.co
Guest

Posted: Thu Nov 01, 2007 10:03 pm Post subject: 496 Audio

Marty and all,

  

 We learned a bunch today about audio out  from the Garmin 496 that could be helpftul.

  

 I had a harness built by Stark to allow me  to put audio from the power/data chord from a 2/3/496 into unswitched audio in  my GMA340 audio panel.  Seemed like a simple thing, but we never got any  audio from the power/data chord.  Audio jack, yes, data chord,  no.

  

 Turns out the audio from the power/data  cable is to drive an 8 ohm speaker.  I learned that by taking apart a  Garmin 12V adapter/speaker and reading the back of the $.05 speaker inside: Made  in China, 8 Ohms, 2/3W.

  

 The audio panel was looking for a 600 ohm  input.

  

 Interestingly, Garmin told told both John  and me that the only audio coming out of the 496, in aviation mode, was from the  audio jack(3/496s have a 1/8" audio jack, which outputs XM audio, and all the  warnings, as well as "Voice +" and "Voice -" wires in the power/data  cable).  Garmin said not even to bother trying to get audio from the Voice  wires while in aviation mode.  It did not exist.

  

 Well, it does exist because it plays just  fine with the speaker/12V adapter plugged in.  I put the unit in sim mode  and flew into a mountain.  The speaker gives every warning you would  expect, and the "Sound" page of the Setup menu controls the audio as you would  expect.

  

 With a jack inserted into the audio plug,  the XM audio is turned off to the power/data chord but all the warnings still  come through.  Which is nice, because if you wire the unit per Garmin's  advice, and run the audio jack into the music input of the audio panel, your  terrain warnings will get muted by intercom activity or incoming  transmissions.  I want to know about those pesky mountains, even if it  interupts music playing in the background...

  

 Now my problem is to figure out how to  convert the 8 ohm signal from the power/data chord to 600 ohms.  I guess I  need a transformer.  I found a 8 ohm to 1000 ohm, with center tap, at  radio shack...can anyone tell me if that will work?  How do I wire  it?

  

  Dave Saylor

 AirCrafters LLC

 140 Aviation Way

 Watsonville, CA 

 831-722-9141

 831-750-0284 CL

 www.AirCraftersLLC.com



    [quote][b]

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bobf(at)feldtman.com
Guest

Posted: Fri Nov 02, 2007 4:18 am Post subject: 496 Audio

I'd try one half the transformer. use the center tap for ground and one of the other ones. that would be 500 ohms. - pretty dang close



bobf



On 11/2/07,  Dave Saylor <Dave(at)aircraftersllc.com (Dave(at)aircraftersllc.com)> wrote:[quote] Marty and all,

 

We learned a bunch today about audio out  from the Garmin 496 that could be helpftul.

 

I had a harness built by Stark to allow me  to put audio from the power/data chord from a 2/3/496 into unswitched audio in  my GMA340 audio panel.  Seemed like a simple thing, but we never got any  audio from the power/data chord.  Audio jack, yes, data chord,  no. 

 

Turns out the audio from the power/data  cable is to drive an 8 ohm speaker.  I learned that by taking apart a  Garmin 12V adapter/speaker and reading the back of the $.05 speaker inside: Made  in China, 8 Ohms, 2/3W. 

 

The audio panel was looking for a 600 ohm  input.

 

Interestingly, Garmin told told both John  and me that the only audio coming out of the 496, in aviation mode, was from the  audio jack(3/496s have a 1/8" audio jack, which outputs XM audio, and all the  warnings, as well as "Voice +" and "Voice -" wires in the power/data  cable).  Garmin said not even to bother trying to get audio from the Voice  wires while in aviation mode.  It did not exist. 

 

Well, it does exist because it plays just  fine with the speaker/12V adapter plugged in.  I put the unit in sim mode  and flew into a mountain.  The speaker gives every warning you would  expect, and the "Sound" page of the Setup menu controls the audio as you would  expect. 

 

With a jack inserted into the audio plug,  the XM audio is turned off to the power/data chord but all the warnings still  come through.  Which is nice, because if you wire the unit per Garmin's  advice, and run the audio jack into the music input of the audio panel, your  terrain warnings will get muted by intercom activity or incoming  transmissions.  I want to know about those pesky mountains, even if it  interupts music playing in the background... 

 

Now my problem is to figure out how to  convert the 8 ohm signal from the power/data chord to 600 ohms.  I guess I  need a transformer.  I found a 8 ohm to 1000 ohm, with center tap, at  radio shack...can anyone tell me if that will work?  How do I wire  it? 

 

Dave Saylor

AirCrafters LLC

140 Aviation Way 

Watsonville, CA 

831-722-9141

831-750-0284 CL

 

[b]

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Melvinke(at)coho.net
Guest

Posted: Fri Nov 02, 2007 3:59 pm Post subject: 496 Audio

Very useful information! I am currently wiring the 496 audio/warning output

into the "music" jack of the PS4000 audio-panel. Does one tie the "voice+"

and "warning" wires together into the "tip" terminal, and the "voice -" to

the other?

Thanks,

Kenneth Melvin, Hillsboro, Oregon.

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Dave(at)AirCraftersLLC.co
Guest

Posted: Sun Nov 04, 2007 9:51 pm Post subject: 496 Audio

I'm afraid I'm not familiar with the PS audio panel.  I do know in the past

they have been far more willing to help make weird things work than Garmin

seems to be.



Dave Saylor

AirCrafters LLC

140 Aviation Way

Watsonville, CA 

831-722-9141

831-750-0284 CL

www.AirCraftersLLC.com

 



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Melvinke(at)coho.net
Guest

Posted: Thu Nov 08, 2007 4:26 pm Post subject: 496 Audio

I congratulate Dave Saylor upon his excellent instructions for connecting up

the audio messages/warnings from the Garmin 496 into the audiopanel. I can

now confirm that his method, described on this list November 1st., delivers

the desired results, loud and clear.

Kenneth Melvin, RV9A,

Hillsboro, Oregon.

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Dave(at)AirCraftersLLC.co
Guest

Posted: Fri Nov 09, 2007 1:28 pm Post subject: 496 Audio

Thanks, Ken.  I'll pass this on to Jacek, who did most of the grunt work.



Dave 



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