Re: Sound card question

[Doug <dmcgarrett@optonline.net>]

On 10/01/2015 09:52 AM, Danny wrote:
> On Sep 30 15, Doug :
> > To: debian-user@lists.debian.org
> > Date: Wed, 30 Sep 2015 13:39:16 -0400
> > From: Doug <dmcgarrett@optonline.net>
> > Subject: Re: Sound card question
> > User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101
> >   Thunderbird/38.2.0
> > X-Loop: debian-user@lists.debian.org
> >
> >
> >
> > On 09/30/2015 09:55 AM, Danny wrote:
> > > Hi guys,
> > >
> > > I have a Sigmatel STAC9227 on-board sound card. Everything works fine as it
> > > should. It has the normal Mic , Ext.Speaker and Line-Out jacks.
> > >
> > > Currently the Mic and Ext.Speaker plugs are permanently occupied via speaker/mic
> > > headphones (Amateur Radio Stuff) ...
> > >
> > > What I would like to know is if it would be possible to send audio that goes to
> > > the headphones to the Line-Out jack at the same time?
> > >
> > > Thank You
> > >
> > > Danny
> > Why not just get a Y adapter?
> >
> > --dm
>
> lol ... that never even crossed my mind ...
>
> Using a Y-adapter naturally forces the following question:
> Does it effectively split the power/gain into two and I end up with half on one
> side and half on the other?
>
> Danny
I believe that the output of the headphone jack is not impedance matched--I expect it's just
a voltage source. Wat's more, unless you are plugging the same low-impedance devices into
both Y outputs, _and_ the source is impedance matched, you would not split the power
equally. I don't know what you want to do with the second output, but it's more
than likely a relatively high impedance, so it would not load the circuit at all.
I could be wrong, but it seems logical to me.

--doug