2 x SD cards, debugger off board now.

Need to do more work on the firmware. After that i'll need to remake the 2 layer analogue board. It will be 10x10 cm and should go under the digital board with the 2 x ADC/DAC cards bridging them.

I need to make the power supply into cards to and separate the phantom power card. I like the system to be as modular as possible so I can upgrade designs in each card as I go. I need to start making all the cards 3cm high max so the final size of the box reduced. I'll probebly end up just using 2 x Dsub connectors for IO breakout cables.

I forgot to mention on my last PCBway.com rant that they have a really nice online gerber tool. https://www.pcbway.com/project/OnlineGerberViewer

Its really useful to check you solder traces with a proper gerber viewer and do a final check !

here you can see the DSP AUAU1467 and I'm checking some I2C lines that run between the GND pad and out through the top left corner. Not really pretty routing and I had to shrink the traces down to 6mil to get them through. you can toggle the layers on and off to get a proper idea of whats going on :)

Here I'm looking at the uSD cards and checking the new traces. I made this much more neat this time and made it obvious which resistor is the pullup for the slot populated switch this time.

Although your DRC should pick up any un-routed / shorted tracks its definitely worth checking the Gerber files. I had a few time submitted mechanical layers that were defined as copper layers by mistake and just shorted tons of tracks. lucky for me PCBway spotted the error but I could have save a lot of time by just checking the gerbers with this tool.