[sdiy] analoge audio to digital s/pdif (dac schematics?)

[STRPSE_K9D _]

i want to use the s/pdif audio inputs on an "maudio fast track pro"
sound card as additional analoge line ins, but it seems like all the
gear to convert analog signals to s/pdif is aimed at hifi professional
studios.

so has anyone seen any schematics around a DAC or something for the job?

the maudio card has rca/coax s/pdif inputs, if that matters at all (i
know the s/pdif signal is the same regardless of the interface, but
i'm not looking for toslink or ttl hardware ... though i have seen
schematics for coax<->ttl bla bla bla ;)

i realize this isn't entirely synth related, but i want more imputs
for my x0xb0x jams =)

thanks in advance for any pointers

<3
j.0rdan

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