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In Reply to: RE: Tweaking Small Board Computers posted by Dynobot on February 26, 2020 at 18:43:37
3.3 volt logic level from the S/PDIF output on that tinkerboard??
Dave.
Follow Ups:
3.3v would be a little high for SPDIF, I believe the spec is 0.6v max for output.
I don't know what it measures but according to ASUS the pinouts are for SPDIF, so I'd assume they know what they are doing and made it to spec.
Guessing.
Either way, it works and sounds pretty good. No ill effects on my Dac for the past couple of weeks.
Dynobots Audio - Music is the Bridge Between Heaven and Earth
Dynobots GitHub - Music to Your Ears
You might want to check it.
I suspect you'll find it doesn't conform to the 0.5-VPP consumer-level standard.
Dave.
Thanks I'll check it and make sure, last thing I want is for it to overload my SPDIF input and cause a problem down the road.
Thanks for the heads up...
Dynobots Audio - Music is the Bridge Between Heaven and Earth
Dynobots GitHub - Music to Your Ears
The preferable way to get consumer S/PDIF from a Tinker/Raspberry/whatever is to mount an appropriate daughter card on top. (DigiOne or similar.)
This will provide the proper level and can also have a proper clock so you avoid jitter issues.
Dave.
Well, I'm getting a steady 0.5v, my Dac seems to like it.
As far as the rest, been-there-done-that....I have "all" of the boards and methods you mentioned. But that defeats the purpose of Tweaking and DIY and takes away from the enjoyment of this hobby.
Thanks
Dynobots Audio - Music is the Bridge Between Heaven and Earth
Dynobots GitHub - Music to Your Ears
FYI, this is what the S/PDIF output of your tinkerboard looks like.
Dave.
Thats greatFortunately for me my ears can't hear what my eyes see...
:-)
This is to say, specs and numbers for sound mean nothing if they are not audible to me. I also can't hear with other peoples ears, so if someone else hears a difference I don't worry about it.It also means I get to enjoy my hobby worry free of chasing numbers or that elusive perfect sound that "Audiophiles" seem to be obsessed with.
Enjoy!!
Dynobots Audio - Music is the Bridge Between Heaven and Earth
Dynobots GitHub - Music to Your Ears
Edits: 02/28/20 02/28/20
I think you're missing the point.
That's a logic level (0-3.3VDC) signal and is not designed to be terminated into the 75-ohm load of a consumer S/PDIF input.
An appropriate interfacing circuit should be used between the source and load, in this instance.
Dave.
Its fine, I see the point.
No worries, I have probably a dozen or so SBC's that are in use at various places around the house...from Odroids to RPi's, Beagle Bones etc etc with all sorts of HATS, USB converters etc. This was an experiment on a board thats not in rotation for duty.
I have boards and regular computers of all sorts that I play with for experimentation. For my listening pleasure I use Rpi4/Allo digione sig, Rpi3/SingXer F1, Allo USBSig, and various other Rpi's with outboard USB converters.....all proper ways of doing it...
No worries, just toys to play with.
Dynobots Audio - Music is the Bridge Between Heaven and Earth
Dynobots GitHub - Music to Your Ears
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