Anyone using a USB DSD DAC?

There are already people in japan using both the Usb-Audio PCB from electrart and the USBPAL from Rigisystems to record and playback DSD from Windows based PC's. After reading through every Japanese forum (using google translate) talking about this I could find, I was convinced they had this working for more than 1 year, and still NO talk about it in English except 1 single post on diyaudio from member 'Bunpei', the guy behind the sdtrans192 project!!
Needless to say I ordered the USB-Audio PCB as soon as I could contact them, and now I am waiting on receiving the Buffalo-II DAC to finish wiring it up. I also ordered a TI PCM4202EVM ADC evaluation module, so I could test recording immediately.
As soon as the Buffalo-II comes I will post updates. The only other hardware required was a few power supplies, 2 Bipolar supplies for the analog stage I/O, 2 5v supplies for the logic on the ADC and DAC. I have made tested my supplies, so as soon as the Buffalo-II arrives (already assembled and tested) I will be up and running.

I have been researching(aka reading on the internet) DSD downloads over the holidays. I figured out how to download the iso image and burn it on a DVD-R using the Audiogate software. I downloaded several free samples and it worked very well. I then purchased Blue Coast Collection from Blue Coast records, downloaded the DSD iso image and burned it to a DVD-R. I can now take these DSD discs I've created and play them on my Sony XA5400es. I must say they sound wonderful, exceeded my expectations. If you have a XA5400es or any other DSD machine you owe to yourself to try this.

I assume they are using custom drivers? Standard USB Audio would entail converting the DSD to PCM, then back to DSD, which defeats the purpose.

The ElectrArt has 2 modes, a usb 1.0 generic driver mode, that works on os x and windows 24bit/96khz without dsd support, and USB 2.0 asynchronous mode, with a proprietary driver that only supports DSD 2.8mhz and 5.6mhz on windows so far. Playback and recording also only with proprietary very basic software, with no English documentation.

I have received the last part I needed, the Buffalo-II DAC. After wiring up all power supplies and boards I got DSD playback working. another hour figuring out jumper settings and I got recording working. Testa so far are preliminary, with only a few records and some radio recorded. I am impressed so far with the sound quality, the buffalo-II certifiably blows away my previous DAC even with 16/44.1 cd's.

The DIY part of my project is just starting, but this proof of concept is working. I am excited to have access to this format on my computers, arguments aside about dsd/pcm debates....
I am planning a few custom analog stages, both for the DAC and ADC. First tests with the buffalo are with the Legato I/V stage, impressed so far.

My plans are to experiment with other discrete class a stages and definitely going to try SET tubes at some point, maybe some 2a3 single plates....

On the digital side adding SDIF-3 I/O, possibly also DSD over optical cable via the meitner spec. Modding a sacd player with SDIF-3 is also on the horizon. I am a firm believer we need real standards here for greater acceptance of the format, many people want a pure connection for feeding DSD to there DAC without downsampling, but the only options now are VERY expensive. (ie. boutique audiophile or high end professional gear) SDIF-3 is found on more gear AFAIK (Neve DSD ADC, Tascam dsd recorders, DAD, Prism, Meitner.) Also looking into a method of sending DSD over HDMI, probably not ever for compatibility with modern recievers or other DAC's, but only for a high quality cable...

If anyone else wants to follow in my footsteps all the parts are available to anyone, and there are many options for ADC and DAC, depending on whether dsd 128fs is needed. the AKM chips are very interesting, but i could only find ones suporting 64fs, and I wanted 128fs for my first tests.
If you have the cash the ESS9018 Evaluation Kit is $666 with powersupply and I/V stage, not sure if it sounds better than a Buffalo-II, but it is a plug and play solution for those not wanting to build a buffalo kit and all of its associated powersupplies/analog boards. The ADC was a evaluation kit ordered from TI, chosen because it's internal logic is 1-bit DSD, making the dsd files very much like a "raw" format. The pcm 4222 has better specifications, but is internally 5-bit Delta sigma, though it is possible to capture that 5-bit delta sigma signal for custom mathematical models, which I believe is what DAD is doing....

there is both 5bit AND 6bit delta sigma output on the pcm4222