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From: mart on 30 Dec 2009 18:40
http://cgi.ebay.ca/SONY-Optical-signal-To-RCA-Stereo-Sound-Decoder-PCM1728_W0QQitemZ190361044639QQcmdZViewItemQQptZReceivers_Tuners?hash=item2c5267069f#ht_3842wt_1165

Anyone know if this will work to convert optical out of an HDTV to an old
style stereo receiver via "conventional" rca cables. I assume 12vdc can be
supplied thru an old atx power supply.

Thanks
From: Kalman Rubinson on 30 Dec 2009 19:45
On Wed, 30 Dec 2009 23:40:58 GMT, mart <mxxx(a)nowherexcv.net> wrote:

>http://cgi.ebay.ca/SONY-Optical-signal-To-RCA-Stereo-Sound-Decoder-PCM1728_W0QQitemZ190361044639QQcmdZViewItemQQptZReceivers_Tuners?hash=item2c5267069f#ht_3842wt_1165
>
>Anyone know if this will work to convert optical out of an HDTV to an old
>style stereo receiver via "conventional" rca cables. I assume 12vdc can be
>supplied thru an old atx power supply.
>
>Thanks

Yes as long as the optical output is PCM. However, I do not know if
your TV outputs PCM or, more likely, DolbyDigital. If the latter, it
will not work.

This one is pricey but probably what you want:
http://www.ramelectronics.net/audio-video/audio-converters-extenders/analog-to-digital-digital-to-analog/digital-to-analog-decoder-gtv-dd-2-aa/prodGTVDD2AA.html
OTOH, if you get a new receiver, it will have the proper input.

Kal

From: Dave Platt on 30 Dec 2009 20:33

>http://cgi.ebay.ca/SONY-Optical-signal-To-RCA-Stereo-Sound-Decoder-PCM1728_W0QQitemZ190361044639QQcmdZViewItemQQptZReceivers_Tuners?hash=item2c5267069f#ht_3842wt_1165
>
>Anyone know if this will work to convert optical out of an HDTV to an old
>style stereo receiver via "conventional" rca cables.

It may, at least for programs whose audio is being provided in
(or can be downsampled to) "linear PCM" format. This board uses a
Burr-Brown PCM1728 stereo-audio converter chip, which will handle data
sampling rates up to 96 kilosamples/second. I can't tell from the
eBay description, whether this board is designed for just one sampling
rate (e.g. CD) or whether it's capable of locking onto a bunch of
different sampling rates.

This board will almost certainly *not* handle Dolby Digital, or other
multi-channel digital surround-sound formats. If your HDTV tries to
send this format of data, one of two things will probably happen: the
converter will go mute, or it'll start making horrible noises. You
should set your TV's audio mode settings to "linear PCM" only.


> I assume 12vdc can be
>supplied thru an old atx power supply.

Probably not a good idea. ATX supplies are intended for much higher
current levels than this board is likely to need, and tend to require
a fairly substantial minimum load on the 5-volt line. Without such a
load, they either won't produce 12 volts at all, or will produce too
high a voltage (poor regulation). They may also be noisier
(electrically) than you would want in an audio application.

The board probably doesn't draw more than an ampere at +12 - buy
yourself a 12-volt linear (transformer/rectifier/filter caps) "wall
wart" supply.


--
Dave Platt <dplatt(a)radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!
From: mart on 30 Dec 2009 21:24
On Wed, 30 Dec 2009 17:33:06 -0800, Dave Platt wrote:

>
>>http://cgi.ebay.ca/SONY-Optical-signal-To-RCA-Stereo-Sound-Decoder-PCM1728_W0QQitemZ190361044639QQcmdZViewItemQQptZReceivers_Tuners?hash=item2c5267069f#ht_3842wt_1165
>>
>>Anyone know if this will work to convert optical out of an HDTV to an old
>>style stereo receiver via "conventional" rca cables.
>
> It may, at least for programs whose audio is being provided in
> (or can be downsampled to) "linear PCM" format. This board uses a
> Burr-Brown PCM1728 stereo-audio converter chip, which will handle data
> sampling rates up to 96 kilosamples/second. I can't tell from the
> eBay description, whether this board is designed for just one sampling
> rate (e.g. CD) or whether it's capable of locking onto a bunch of
> different sampling rates.
>
> This board will almost certainly *not* handle Dolby Digital, or other
> multi-channel digital surround-sound formats. If your HDTV tries to
> send this format of data, one of two things will probably happen: the
> converter will go mute, or it'll start making horrible noises. You
> should set your TV's audio mode settings to "linear PCM" only.
>
>
>> I assume 12vdc can be
>>supplied thru an old atx power supply.
>
> Probably not a good idea. ATX supplies are intended for much higher
> current levels than this board is likely to need, and tend to require
> a fairly substantial minimum load on the 5-volt line. Without such a
> load, they either won't produce 12 volts at all, or will produce too
> high a voltage (poor regulation). They may also be noisier
> (electrically) than you would want in an audio application.
>
> The board probably doesn't draw more than an ampere at +12 - buy
> yourself a 12-volt linear (transformer/rectifier/filter caps) "wall
> wart" supply.

Thanks both for the info. All I really want is some improvement over the
sound, especially bass, of the built-in speakers. 2.1 is fine don't
need/want 5.1. I have looked for PC speakers with a decent sub and optical
input but they are very expensive and I dont want to spend 100's on a HT
setup as I already have a decent receiver and speakers. Looks like I may
need to source a decent used receiver/amp with optical inputs and use my
existing speakers.

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