schematic for an optical to SPDIF (coax) circuit - diyAudio
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Old 6th November 2008, 11:29 PM   #1
jarthel is offline jarthel  Australia
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Default schematic for an optical to SPDIF (coax) circuit

I've search the forums and the net and general but came away somewhat empty.

I found discussions here and in other forums mentioning an epanorama article. but I am not sure which is applicable to my need.

can you please help?

thank you!

ps. I've found lots of ready made products but I'm trying to find a DIY solution
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Old 7th November 2008, 02:38 AM   #2
TS Lo is offline TS Lo  Hong Kong
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Hi,

You can find an article "opto-to-coaxial audio converter"
in the 04/97 issue of Elektor Electronics.

Cheers

TS
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Old 7th November 2008, 03:49 AM   #3
sandyK is offline sandyK  Australia
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Default Optical to SPDIF converter

jarthel

Have a look at the Silicon Chip website. This used to be available as a kit from Jaycar,but is no longer stocked.
SandyK

http://www.siliconchip.com.au/cms/A_107004/article.html
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Old 7th November 2008, 04:06 PM   #4
anbello is offline anbello  Italy
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In this page
http://www.epanorama.net/documents/audio/spdif.html
you can find all the information you need to do your converter.

ciao
andrea
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Old 7th November 2008, 04:18 PM   #5
xaudiox is offline xaudiox  Philippines
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Default from silicon chip

Click the image to open in full size.
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Old 7th November 2008, 07:20 PM   #6
sandyK is offline sandyK  Australia
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Default optical to SPDIF

xaudiox
I would remind you that the diagram you posted is copyright., and should not be posted in an open forum. It may have been much fairer to forward a copy by email to people who ask you by email ?
SandyK
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Old 8th November 2008, 04:55 AM   #7
TS Lo is offline TS Lo  Hong Kong
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Hi Sandyk,

You're right, thats why I didn't attach a copy
of the article mentioned in Post #2.

Cheeers
TS
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Old 11th November 2008, 09:03 PM   #8
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You could just look at the datasheet for a Toslink receiver (TORX). They have a very simple circuit right there. We use it, works great.

http://www.toshiba.com/taec/componen...//215/4898.pdf

http://www.twistedpearaudio.com/imag..._schematic.jpg
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Old 12th November 2008, 08:25 AM   #9
anbello is offline anbello  Italy
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copyright yes copyright ...
but i see the same schematic on at least 3 other magazine and in numerous web site i think all copied by the same source: the link i give on post #4

@BrianDonegan:
your circuit is good but to have what is in the thread's title you have ta add a coax spdif driver: in the schematic proposed the hct04 in parallel plus coupling capacitor plus resistor network to have the right amplitude and output impedance. Maybe it's better to use an rs422/485 driver in place of the hct04.


ciao
andrea
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Old 12th November 2008, 12:47 PM   #10
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Quote:
@BrianDonegan: your circuit is good but to have what is in the thread's title you have ta add a coax spdif driver: in the schematic proposed the hct04 in parallel plus coupling capacitor plus resistor network to have the right amplitude and output impedance. Maybe it's better to use an rs422/485 driver in place of the hct04.
This would be true if a) you cannot utilize TTL level (3.3V) SPDIF and b) you will be transmitting the signal over some distance. Typically you would use the Optical for the distance, then convert locally at your destination. If you only need to go a few cm or inches, a driver is not needed. If you cannot use TTL, a simple resistor divider can be added for a few cents.
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