Many moons ago one of our resident DAC experts, Fred, was kind enough to karma an evaluation board for Burr Brown's PCM1792 DAC chip. His stipulation was that whomever won the karma would build the board out and use it. I won, building the DAC using a Placid bipolar supply from Twisted Pear to power the analog section, a power supply Fred included for the digital and DAC sections, and eventually adding a USB to S/Pdif convertor from miniDSP to get music off my computer.
Here is the link to Fred's build for those that are interested: http://www.polkaudio.com/forums/show...ght=burr+brown
Here's a link to the manual for the board: http://www.tij.co.jp/jp/lit/ug/sleu037/sleu037.pdf
With the fast pace of changes in the DAC world, especially in regards to high resolution files and computer audio, I feel like it's time to freshen up the DAC. It'll be slow, upgrading a section at a time as funds (and time) allow. The goals are: playing files up to 24/192 from a USB source, having a second BNC input for a connection from a cd players digital coaxial output, have as many inputs as possible (at least the USB) connected to the DAC board via I2S , with seperate power supplies for the analog, digital, DAC, and USB convertor, and have the power supplies et al in a different chassis then the stuff that handles signal, and have the USB convertor be asynchronous.
Right now the DAC functions as it sits. In terms of order of upgrade, I think the power section is most important. I have power supply boards from Salas, a poster on DIyaudio, for each of the sections of the DAC. Once I figure out the needs for the power supply boards, I'll turn to transformer selection and figure out how to mount them all.
As I get more involved in it I will report back, if there is any input that anyone has I'd welcome it.