Description of digital distortion meter design, with CAD files

I have been asked for the CAD files for the distortion meter I recently built.

NOTE 10 Jan 2016 : I have changed the clock driving and distribution PCB as it really needed to be more versatile to me to run a mix of CS and AKM ADC and DACs. The change allows selection of MCLK at different multiples on the ADC and DAC via jumpers on the board. Again this is prpobably a bit more "hard wired" than a generic consumer device would be, but allows stable operation for fixed sample rate systems.

WARNING:
This project is not a super straight forward "chuck it together and it will all be fine" sort of build. I am providing what is essentially a collection of USB interface (MiniDSP), power supply (mine - open source), backplane, clocking and galvanic isolation (mine - open source), A/D and D/A (mine - open source) and a differential interface and attenuator (Silicon Chip magazine), though I am strongly tempted to do my own.

Anyway, if people are interested in building something like this, then some of the stuff I did will likely help you along.

I have written up what I did, and a few things I learned along the way. This is a fairly long document, it runs to about 20 pages.

For those that want to go a bit further, I have included the ALTIUM schematic and PCB files for the boards. This will give you a running start of you want to roll your own starting from somewhere near this point!

I guarantee this is out there at the edges of DIY - so if you want to jump in, expect some serious learning, and go in with your eyes wide open!

Have fun!
CAD FILES.zip

Distortion_Meter_Description - v2.doc