Raspberry Pi I2S to SPDIF Hat

Discussion in 'Digital: DACs, USB converters, decrapifiers' started by Michael Kelly, Apr 30, 2016.

  1. Michael Kelly

    Michael Kelly MOT: Pi 2 Design

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    I just finished testing about a dozen units. We had a problem with getting the cases back in time so there’s going to be a delay for anyone who ordered the case. We will be sending an email to everyone individually to see if they want to wait or have us ship the case later. Right now it looks like the cases will be here sometime next week.

    It is probably going to take us about 3 to 4 weeks to get the pipeline fully filled and everything running smooth.

    Michael
     
  2. gixxerwimp

    gixxerwimp Professional tricycle rider

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    I searched this thread but only found a question about the 502DAC being compatible with an RPi Zero W. Could I use the PI2AES with an RPi Zero W? As far as mounting it in the Pi 2 Design case, I guess suspending it with 4 screws from above (plus the 2 from below) would be enough to secure it?
     
  3. Michael Kelly

    Michael Kelly MOT: Pi 2 Design

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    I see no reason why it would not work. If I get a chance I will find a PI 0 and test.

    Michael
     
  4. Michael Kelly

    Michael Kelly MOT: Pi 2 Design

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    For anyone who uses ROON, I just finished testing the PI2AES with ropieee which acts as a ROON endpoint. I just used the standard download and set the card to be the Hifiberry Digi+ Pro. They already have an entry for the 502DAC by the way.

    Cheers,
    Michael
     
  5. MisterRogers

    MisterRogers Ethernet Nervosa

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    That's good news Michael.
     
  6. Poleepkwa

    Poleepkwa Friend

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    @Michael Kelly. I have the original 502DAC Rev P1 (old school).
    Has the design improved a lot as a digital transport or are the improvents more on the analogue side?
    I am looking for the plastic 20pin adapter - mine was so stiff it ripped off and a plastic case.
    How can I order that from you?
     
  7. Michael Kelly

    Michael Kelly MOT: Pi 2 Design

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    The 502 DAC uses an analog PCM5122 DAC to provide the clocking that is used to drive the WM8804. This had a couple of limitations including not being able to support 176.4khz files. The PI2AES uses the WM8804 to provide the clocking and there is no analog DAC. It is a purely digital board. Of course, it also adds more output options such as direct I2S parallel and I2S over hdmi.

    As for the broken part I am not sure what you need. Please send an email to [email protected] so we can figure out how to get you up and running again.

    Cheers,
    Michael
     
  8. MisterRogers

    MisterRogers Ethernet Nervosa

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    Looking forward to putting it through its paces. I'm currently running a Signature, and have a few custom linear sources to try (LPS 1.2, Illuminate v3), so I can try single good linear supply vs. powering each separately with good supplies. If I power PI separately, what's the current draw for the HAT?
     
  9. Michael Kelly

    Michael Kelly MOT: Pi 2 Design

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    The PI2AES draws less than 100ma @ 12V when not powering the PI.

    Michael
     
  10. MisterRogers

    MisterRogers Ethernet Nervosa

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    Poyfect!

    The CO crew will be hopefully getting together in the next few months; maybe we'll blind A/B at least single linear PS supplying Pi & HAT (Illuminate v3) vs. Illuminate powering the Pi with an LPS 1.2 powering the PI2AES. I think I'll throw in a standard switcher powering the Pi - see if I'm the only one hearing an improvement powering Pi with a good linear. I know, I know, shouldn't matter. Can't tell you why it does (maybe lowering specific noise on the Pi side cuts down on parasitics?), but it sure seems to with my old ears.
     
  11. Michael Kelly

    Michael Kelly MOT: Pi 2 Design

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    I cna only guess that maybe it affects the jitter in ways that are not readily measurable. But as I have always said, it is your ears that are the final test.

    Michael

    P.S. Who is the CO crew? CO as in Colorado?
     
  12. gixxerwimp

    gixxerwimp Professional tricycle rider

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    I'm running pCP 3.22 on my my Pi Zero W, USB out to Eitr. I can see "Digi+ Pro" as an available output in the Squeezelite settings. Does that mean if I plug in the PI2AES I'm ready to go with the existing build? No additional driver needed?

    Is there any advantage to using the "Audio Optimized" pCP version? I had some stability issues when getting it setup and I'm not sure if it was switching from the "optimized" to "normal" kernel or using the output setting that included "DEV=0" that fixed it.

    RPi/Linux n00b here. Please use simple werds, tks.
     
    Last edited: Jul 19, 2019
  13. MisterRogers

    MisterRogers Ethernet Nervosa

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    Yup, Colorado.
    @jexby, @Elnrik, @Hands, @bixby, @Effusion - you know, the guys responsible for most of the noise and empty calories around here :). We have other more upstanding members like @zerodeefex, @AllanMarcus, etc.
     
  14. Michael Kelly

    Michael Kelly MOT: Pi 2 Design

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    You would need to select the Digi+ pro as the active output. But other than that it should work. I know nothing about Picore Player though.

    Michael
     
  15. Poleepkwa

    Poleepkwa Friend

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    I have to give a shout out to @Michael Kelly, who generous offer too replace my trusty 502DAC P1 with a much never P6 version, at no cost to myself. Excellent customer service!
    Looking forward too having a little shootout with the DigiOne Signature.
     
  16. Michael Kelly

    Michael Kelly MOT: Pi 2 Design

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    Now don’t get too excited. The P6 was created to allow us to use either the NDK clocks or another vendor. This was at a time when the NDK clocks were in short supply. However the other vendor clocks turned out to be worse, so instead of supporting that version we went back to the P4 which only supports the NDK clocks. What you are getting is a P6 board that was left over from the few that we built with NDK clocks. You are helping me get rid of them! Win–Win as they say.

    Cheers,
    Michael
     
  17. Poleepkwa

    Poleepkwa Friend

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    I am excited about your customer service. Hardware is not the only place to impress customers. Indeed a Win-Win.
     
  18. gixxerwimp

    gixxerwimp Professional tricycle rider

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    @Michael Kelly, the website says the PI2AES is out of stock. When will I be able to order one along with a case? Do you ship to Asia? If not, I can get someone in CONUS to forward it to me.
     
  19. earnmyturns

    earnmyturns Smartest friend

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    I've been using pCP with a Pi 3 and a 502DAC for a while, using the AES output, currently pCP 4.1.0. "Audio Optimized" pCP never worked well for me, just using the standard version. I'll be trying pCP 5.0.0 soon, maybe this weekend. Next order a PI2AES, just because? ;)
     
  20. earnmyturns

    earnmyturns Smartest friend

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    I guess not yet, site says PI2AES is sold out. @Michael Kelly any chance you could set the site to take backorders? I don't always check SBAF regularly (there's work, there's travel, ...) so I could easily miss the next ordering window. Thanks!
     

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