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 Audio line out impedance? 
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Joined: Sat Apr 14, 2012 1:58 am
Posts: 22
Post Audio line out impedance?
I've connected my trimslice to an audio amplifier that drives speakers elsewhere in my house. Using media player daemon as an in home jukebox of sorts. It sounds ok, but I'm getting a low level interference from local AM broadcast and some digital noise from the T.S. processor and a connected USB HD.

I thought to try an isolation transformer, eliminating the common ground between the amp and the computer, but can get no signal at all through it. I suspect an impedance mismatch on the side connected to the Trim Slice. I can find no mention of the output voltage level and impedance anywhere in the docs or on the site.

Can someone at CompuLabs tell me what the output impedance of that connector is?


Sun Apr 29, 2012 12:08 am
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Joined: Tue Sep 06, 2011 4:29 pm
Posts: 52
Post Re: Audio line out impedance?
In case you don't have the reference guide it can be found here:
http://trimslice.com/download/documenta ... ce-man.pdf

Audio is addressed in section 3.4.

The audio subsystem is implemented with Texas Instruments TLV320AIC23b
Data sheet can be obtained from:
http://www.ti.com/product/tlv320aic23b

I would let the CompuLab folks answer but it seems they are busy hopefully with an unannounced project :)

Speculation on my side but their absence in the forums makes me think something is been worked on.


Sun Apr 29, 2012 7:09 pm
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Joined: Wed May 25, 2011 11:05 am
Posts: 521
Post Re: Audio line out impedance?
Irads has left compulab.


Sun Apr 29, 2012 7:16 pm
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Joined: Tue Sep 06, 2011 4:29 pm
Posts: 52
Post Re: Audio line out impedance?
That would explain it as well :shock:


Sun Apr 29, 2012 7:57 pm
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