I see there are S/PDIF in connections but which are the S/PDIF out connections ?
There is no such signal for output.
Is it possible to solder some leads to this board and get S/PDIF out to work ?
Yes. Can be added. See below.
I see there is a 5v connection so all you need to do is find the ground and digital signal connections.
No it is not so simple that. It needs to be created. Some little bit more work needed. Actually this card is pretty good starting point for such hacks.
In order to get digital output, begin with that Sigmatel chip. Seems to be DAC. Which signals are around there? get the LRCLK, MCLK, SDATA, SCLK signals found and connect some digital audio transmission converter (CS8406 or something) with that in parallel, which is configured as slave for communication. Then You can have the choice to have as S/PDIF, AES/EBU, TOSLINK or all at the same time. 😉
M-audio Delta cards I modified too to get 5 digital outputs from that multicard. This way all the cards with dedicated serial data DAC-based cards can be modified.
But sorry , no videos about it, I am really not into fancy videos or pictures. Schematics only.
And about sample rates there are also those which can do the conversion in hardware too... if needed.
Current project: DOS ISA soundcard with 24bit/96Khz digital I/O, SB16 compatible switchable.
newly made SB-clone ...with 24bit and AES/EBU... join in development!