Yay! MAudio Revo modded for 3 SPDIF outputs - diyAudio
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Old 14th July 2004, 06:30 PM   #1
MWP is offline MWP  Australia
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Default Yay! MAudio Revo modded for 3 SPDIF outputs

Hi all...

Just had to say somthing about this since im sooo supprised that it worked out first time.

Ive managed to add 3 SPDIF optical outputs to my Revo7.1 card by tapping the AKM4355 I2S lines (the AKM4355 had to be removed though).
I could have added 4 SPDIF outs, but i wanted to keep the original front outs for headphone/misc use.

This will be used for the brutefir active xover + room-eq stuff in my linux box.

Next ill be building a new 6 channel DAC with rectified bridged gainclone amp outputs.

Ive taken some photos of the card:
http://www.overclockers.com.au/~mwp/...20SPDIF%20Mods

If anyone wants to do somthing similar, let me know and ill put the schematics/pcb diagrams up.
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Old 14th July 2004, 10:57 PM   #2
roibm is offline roibm  Romania
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I'd love to get some more over this...
I have an audiophile 2496 and need one more spdif out(coax) for a separate stereo DAC.
BWT, that's really cool what you did over there
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Old 19th July 2004, 09:24 AM   #3
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And people call me crazy for changing a couple of OP-amps on my Revo...

This is really cool. I might be interested in doing something similar on my Revo in the future. But I would probably try to use balanced twisted pair as outputs which connects to some DIY DAC:s close to the rest of of my stereo.

It seems from your pictures that the original DAC is fed with data from three separate wires, one for each stereo pair. Is this correct?

This together with the thread 'PC-music player' really opens up for interesting uses of the PC. Thanks for sharing this.

--- Mikael R

PS. Off topic but like to mention http://www.musicpd.org/ and http://www.netjuke.org/
Some good program for a music playing linux box. .DS
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Old 15th December 2004, 11:53 PM   #4
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How to add more Coaxial S/PDIF electrical digital inputs?
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Old 16th December 2004, 06:12 AM   #5
MWP is offline MWP  Australia
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Quote:
Originally posted by Blue_Max
How to add more Coaxial S/PDIF electrical digital inputs?
Cant.
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Old 16th December 2004, 09:44 PM   #6
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Hi MWP,

could you please share diagrams, schematics and PCB gerbers files?

Thanx!
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Ciao
Michele
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Old 17th December 2004, 03:17 AM   #7
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Quote:
Originally posted by Blue_Max
How to add more Coaxial S/PDIF electrical digital inputs?
Quote:
Originally posted by MWP
Cant.
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Old 17th December 2004, 03:27 AM   #8
jwb is offline jwb  United States
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Hey that's really nice. I've been thinking along the same lines, but I don't know how to use ALSA to make sure that all the streams are synchronized. Do you have any code along these lines?

-jwb
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Old 18th December 2004, 05:02 AM   #9
MWP is offline MWP  Australia
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Quote:
Originally posted by jwb
Hey that's really nice. I've been thinking along the same lines, but I don't know how to use ALSA to make sure that all the streams are synchronized. Do you have any code along these lines?
I use JACK and havnt had any problems.
Although i cant really tell without a scope to test it with.
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Old 18th December 2004, 05:06 AM   #10
MWP is offline MWP  Australia
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Here is a screen cap of the schematic.
There are three of this exact circuit on the PCB with a few power smoothing caps.
Power (3.3V and 5V) is taken off the Revo.
Attached Images
File Type: gif revo-spdif-out.gif (25.5 KB, 624 views)
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