I am considering

* Creative Sound Blaster X-Fi HD USB for headphone jack and SPDIF In.
* StarTech.com 7.1 USB Sound Card with https://www.viatech.com/en/silicon/legacy/audio/vt1630a/ chipset for SPDIF Out, SPDIF In, and headphone jack.
* Realtek ALC887 onboard soundcard for SPDIF out and potentially headphone jack.

Obviously, X-Fi HD has far higher signal to noise ratio for DAC.
But, for SPDIF In,  StarTech.com 7.1 USB soundcard might be cheap and good enough. VT1630A might also have a better implementation of SPDIF out that emits clock signals in the absence of audio signals.
But, everything here is a speculation since I haven't tested any.

On Fri, Aug 9, 2019 at 11:18 AM Chris Caudle <chris@chriscaudle.org> wrote:
On Thu, August 8, 2019 6:39 pm, crocket wrote:
> If there is no audio data from SPDIF out, would SPDIF out still send clock
> signals?

Often that is the case, but you would have to consult the documentation
for your particular audio interface to verify.

--
Chris Caudle


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