Hysteria wrote:Hi All,
if you didn’t read the earlier post I was the one who started this thread with my Chii account which i cant log in under any more.
Anyway funds are tight at the moment, so i can’t even afford the ALU for the internal shielding. however i have found this:
http://www.ebay.co.uk/itm/Hi-end-USB-CM ... 2c6772c1c6
which looks perfect for what I wanted and talking to the seller it can be made to work with I2S directly. for my test unit i intend to buy one of these and then later switch to my own dac design which other than separating out the PSU's and getting rid of all the other inputs will be pretty much the same. I have already asked for the build manual to no avail but this may be ware I put my money as soon as i have some again.
Hysteria wrote:Hi all with V2 hardware coming out soon I am not working on the hardware end of this at the moment. This is because the new hardware version specifically assists those of us wanting to use i2s.
I have however been working on the software but wont post on this until I have the new hardware and a dac working together.
for those of you interested in the DAC solution I am looking to use an AD1896 IC to change the sample rate to 192/24bit using a pink fish media flea for the system clock and then running the i2s from the ad1896 into a pair of wm8741's or for an even better option 4x wm8741's I have now made 6 revisions of the dac board and power supply’s but continue to play to try and get the boards as efficient as I can. I am trying to make these modular so that you can change out the Dac's psu's etc as you need to as things evolve and so that if you want to use something other than a wm8741 say AD1795’s, wm8741 (will fit the same PCB as a wm8741 so don’t see the point though) or even one dac on its own you can. For those on a budget it may mean they can start with one dac then upgrade to diff at a later date.
Looking forward to the V2 pi it will make this field of development so much easier and I hope common place.
Any particular reason why you chose to make the detour through USB when the PI has a perfectly capable I2S port itself?guussie wrote:Has there been any further development with your player? I am interested to hear what has become of it.
I am working on a very similar project. I have successfully used a USB to I2S board and this plays nicely into a cheap Sabre 9023 DAC. Next step would be the Opus but if you can post any experience with that, that would be helpful.
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