Raspberry Pi I2S to SPDIF Hat

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

  1. shabta

    shabta Acquaintance

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    What are peeps using for a case? Any off the shelf cheapo cases?
     

  2. bilboda

    bilboda Acquaintance

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    Cheapy to get started. When I am settled with it, I'll look around for something. The thread has some interesting cases in it. Having it in hand will give me a better idea what to look for. digi+pro is here, this hat will be here next week sometime....
     
  3. noise11

    noise11 Rando

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    hello, may I use this board with a pi zero wifi?
     
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  4. haywood

    haywood Facebook Friend

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    I did things in stages as I got my feet wet with the Pi and wouldn't do things exactly the same way but I bought this for power (except with a black faceplate).

    [​IMG]

    It's basically a Chinese knock-off of the AMB S11 with an R core transformer, you tell them the specifics of what you need wrt power and whatever when you order and they build it for you. I'll be excising the guts to put into a case with the Pi this weekend-ish.

    Wrt cases there aren't any that specifically fit the Pi + 502 so I just got a cheap acrylic one and removed the top when the hat came. If you want something more permanent then one like this with just a top and bottom would be better.
     
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  5. Grahad2

    Grahad2 Friend

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    When it comes I can whip up a .STL case with cutouts so you can get it printed (by a friend, nearby uni, shape ways etc). My standard Pi case is not going to fit it too.
     
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  6. Michael Kelly

    Michael Kelly MOT: Pi 2 Design

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    Yes. You will only get two mounting holes, but that may be enough.

    Cheers,
    Michael
     
  7. Michael Kelly

    Michael Kelly MOT: Pi 2 Design

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    I have posted some new docs on the web site at:

    http://www.pi2design.com/store/p15/502DAC1_-_Pro_Audio_Shield.html

    The HW reference manual and data sheet are up, as well as a 3D step model of the board for you case builders.

    As always, all feedback is welcome!

    As for stock status, we were only able to ship 12 units due to a shortage of the 1/4" to XLR male adapters. More are arriving next Tuesday or Wednesday latest. We will resume shipping then. I know some of you may not care, but we need to ship our complete setup for production units.

    Cheers,
    Michael
     
  8. Miggie78

    Miggie78 Rando

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    @Michael Kelly I think there's a typo on the board image on HW_Ref page 14.
    In the text you talk about the J3 connector but on the picture it's marked as J5?

    [​IMG]

    Also, would be great to have a word about the available headers – if you think they might be of some use to people (for case installation and whatnot).
     
  9. noise11

    noise11 Rando

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    Hi, I got my board today seems to be fine playing 44.1/16 files but I cannot make it work with 96/192 files I'm using volumio with dac+ pro controllers, I also tested moode with same results.
     
  10. Michael Kelly

    Michael Kelly MOT: Pi 2 Design

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    When you select the 192Khz file does the yellow light go on? Also what output are you using?

    Cheers,
    Michael
     
  11. noise11

    noise11 Rando

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    the yellow lights goes on but not the music, I'm using the bnc output.
     
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  12. bilboda

    bilboda Acquaintance

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    I found runeaudio had a default setting when streaming IIRC. It was sending music to the pi at 320 kb, probably transcoding to mp3. I head to change that in the runeaudio software to get the full bitrate. So... volumio software maybe?
     
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  13. noise11

    noise11 Rando

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    Just to let you know guys I'm using an bcn to coax adapter because my dac has no bnc input, I tried the optical output from the board and it's working correctly that way connected to my dac (nuprime ida-8 which is an amp/dac combo).
     
  14. bilboda

    bilboda Acquaintance

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    And you removed the jumper on the 502dac to set the correct voltage for the coax spdif?
     
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  15. auri

    auri Almost "Made"

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    Got mine today. Woohoo!

    Psst @Michael Kelly - the middle USB header on my RPi board came a little cockeyed, causing it to short out one of the pins on the BNC connector with the stock height headers. I clipped them off flush and it's all good now. Here's a pic.
     
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  16. haywood

    haywood Facebook Friend

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    I ended up getting my case after the weekend (thanks prime!) so didn't have as much free time to work on it but it's finally mostly together now.

    [​IMG]

    The case bottom has an indentation for fitting an ssd or something which is maybe good if you're using the intended logic board and building an htpc but in my case just made things a little more "interesting" and of course there were lots of little things like that which was both fun and aggravating. On the plus side it looks like evil alien technology. I have the Pi still in the iPod box because of the high-pitched noise, and it's on top because there's plenty of room for the Pi inside but not so much the Pi inside the box. The power cable is just half the one from the Chinese lps, I'll do something less hacky later and obviously it won't need to be so long. The little Samsung ssd is disconnected for a bit in case things go disastrously bad during the initial test run, so I'm just listening to one of the Moode radio presets.
     
  17. Grahad2

    Grahad2 Friend

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    Wouldn't the high pitched whine be muffled by the case?
     
  18. haywood

    haywood Facebook Friend

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    You'd think but not so much in practice. There are a few things going on. First the cardboard box doesn't reflect sound like anodized aluminum does and there's foam on the top where I poked all the holes whereas the metal case vents are just holes. Second the iPod box is pretty snug which keeps the Pi warm and I'd previously found that also mitigated the sound, the Pi in the case doesn't get that warm. And I guess compounding those things is there's no real back on the case at the moment as it's meant for a mini-itx board with its relatively big (in terms of Pi hats) i/o shield. Obviously if I had to I could take steps to address it, and some of that I'll do anyway like a cover for the rear opening, but Michael seems to have fixed the problem on production boards.
     
  19. neogeosnk

    neogeosnk Almost "Made"

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    How exactly are you doing this?
     
  20. Grahad2

    Grahad2 Friend

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    You can take a look at this thread.

     
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