Quick question about the SPDIF header
#1
Hi all! I'd like to use the SPDIF pin on the 22-pin GPIO header to be able to do AC3 and DTS passthrough to my AV receiver over coax. I'm not trying to do optical out, and not trying to use an external DAC. The Rock64 is running Linux (libreelec) and I have an audio output device for SPDIF. Is it as simple as taking an RCA jack and just connecting the tip to the SPDIF pin and ring to a ground pin? Or is a more sophisticated circuit required for some reason? Thanks in advance!


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#2
(09-24-2020, 04:07 PM)theophile Wrote: Hi all! I'd like to use the SPDIF pin on the 22-pin GPIO header to be able to do AC3 and DTS passthrough to my AV receiver over coax. I'm not trying to do optical out, and not trying to use an external DAC. The Rock64 is running Linux (libreelec) and I have an audio output device for SPDIF. Is it as simple as taking an RCA jack and just connecting the tip to the SPDIF pin and ring to a ground pin? Or is a more sophisticated circuit required for some reason? Thanks in advance!
I'll answer my own question. Yes it works! Two wires and done!
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#3
(09-24-2020, 08:22 PM)theophile Wrote:
(09-24-2020, 04:07 PM)theophile Wrote: Hi all! I'd like to use the SPDIF pin on the 22-pin GPIO header to be able to do AC3 and DTS passthrough to my AV receiver over coax. I'm not trying to do optical out, and not trying to use an external DAC. The Rock64 is running Linux (libreelec) and I have an audio output device for SPDIF. Is it as simple as taking an RCA jack and just connecting the tip to the SPDIF pin and ring to a ground pin? Or is a more sophisticated circuit required for some reason? Thanks in advance!
I'll answer my own question. Yes it works! Two wires and done!

For stronger driver output, you can cascade 3-4 7407 buffer driver.
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