Regarding the output stage, it is the same design that was used for the AK4490 DAC. Be sure to extract the contents of “Libraries (place in Libraries folder)” to your Arduino IDE’s “libraries” folder. In this download I am including the modified versions of the libraries (as mentioned in the above linked post) as well as the necessary font files. The hardware of the controller is the same that was used with the Dual Mono AK4490 DAC. There are a number of to-do’s though, such as displaying the bit depth of the incoming PCM signal (from the USB port), plus more information on the incoming DSD stream (such as whether it is in DoP or Native format). It offers full compatibility with my XMOS / SPDIF board.It now supports the Si544 instead of the Si570.It has support for triggering a muting relay.It has support for all of the AK4493’s digital filters.It has been adapted to enable the AK4493s’ PCM/DSD auto detection feature.Now, regarding the Arduino code needed to control this board(s), it is not very different than that used to control the AK4490s. If anybody is feeling particularly adventurous, drop me a line and I’ll see if I have any PCBs left. Plus you will need XMOS’ xTAG programmer to burn firmware into the XMOS chip. I would then standardize my DAC designs with this inputs board in mind, including properly supporting it in my Arduino code.ĭescribing in detail this board is beyond the scope of this post, but suffice it to say, building it is not for beginners. It would also include some light USB line conditioning and an AK4118-based S/PDIF receiver with 4+2 inputs. Early on I realized that it would be best if I designed my own XMOS-based receiver board, custom tailored to my needs. I was particularly surprised to hear how much of a difference having correct (and uniform across my devices / stereo components) electrical phase in my power cords made.Īlso, having a properly designed and implemented USB to I2S receiver is very important. In a resolving system, any change in anything makes audible differences. We got the best (audible) results by using a couple of paralleled LT3045s.
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