Originally Posted by sfogg
" so it would be to build something like on this picture, but with the TOTX 179's replaced and the resistors added (somewhere)..."
You would need to look at the sound card itself to see what is has on those SPDIF outputs. It may need nothing more then wiring those pins (and the grounds) to 3 RCA jacks. If it isn't terminated properly then you would need a resistor or two and possibly a capacitor for each output.
Shawn
Thanks. he figure indicates a serially 390ohm resistor and a 91 ohm to ground, I don't know if the capacitor from the Toslink example should be removed or not though. BTW, would 0,6W resistors be fine?

HD621, G98DH, G68ADV, Bc Acoustiqe ACT A3, 5200C DSP33, NuForce Reference 9 monoblocks, 2x SB3's, Velodyne DD-15 & DD-12 Subwoofers and a Meridian sub.