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Converting toslink output to coax

I ran across a website describing how to mod an XBox AV Pack to install a coax digital output instead of a toslink output. Seemed pretty easy:

http://wrongcrowd.com/xboxspdif/

I've got a little MAudio Sonica I use, which is a USB to toslink converter for audio. I'd rather have a USB to coax digital converter, however. I'm thinking about cracking it open any trying this mod, but wanted to check with the tech heads to see if this is advisable... Is the only difference between toslink and coax an optical jack fixture v. a coax fixture? The MAudio internals probably don't look the same and may use a different toslink fixture. Is there anything I should look for in terms of knowing which leads to solder where? A double check to verify it works before hooking it up to expensive gear? If I hook it up wrong, how badly can I damage things?
edesilva
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edesilva OP
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The most useful reference seemed to be:

"The signal at (used to drive) the toslink is the same signal as used for the coax out. So, find an old unit (Cd player) that has a coax out and remove it's tramsformer. Or you can use resistors to scale a 75 ohm output. The signal is TTL at around 5V, and the coax out is 1V. So scale resitors to give you 1V and use a 75 ohm output resistor. Good Luck, bobwire"

The really sad part is that a week ago, I finally threw out my old Micromega Leader 2 CD player. *argh* This happens every time I throw something out...
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