![]() ![]() Universal Signal Isolator shield for the Arduino DUE (Rev.1).pdf (2805 downloads) The documentation for the original design (in archive form) can be found here: The following documentation pertains to the newer design. I have introduced it in this post, detailing the changes from the original design. 1.1 boards (very similar to the original design) and then finally this PCB: ![]() The result of this optimization was a short run of Rev. The original design was completed around September 2015, but since then there has been a lot of interest in this design so I have been further optimizing it. Thus was born the Universal Signal Isolator shield for the Arduino DUE: It would provide electrical isolation for both I2C as well as serial signalling. ![]() My first thought was to design a new shield specific to the dam but then I thought “why not design a universal isolator shield?”. This means that my Arduino would have to share a common ground with my XMOS-based USB interface. Even though this interface is electrically isolated from the dam board, it is not isolated from the USB to I2S interface. The years passed and my needs changed with the introduction of the dam1021 DAC and its serial interface. To accomplish that I had designed a little Arduino shield. I have written code to control them with the help of Arduinos, but early on I realized that I also needed to have electrical isolation between the Arduino and the DAC, in order to eliminate the possibility of interference and/or noise. Since these last few years DACs have become fairly complex, sometimes they can benefit from being controlled by microcontrollers. I myself own two such DACs, a Buffalo III and a Soekris dam1021. A big part of DIY audio is building DACs. If you are reading these lines, you are probably into DIY audio. ![]()
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