Altitude

My new euro module: https://michigansynthworks.com/p/sy0-5-analog-drum-module-coming-fall-2018

and thats why we run prototypes :)     

Im with Andy, I always make the isolation as BIG as practical.  If you have to pack it in, you have to pack it in but only do so where absolutely needed.  You can pour different polygons with different isolation on the same net too if you need it tight one place and not another.  Every time i've gotten bad boards from OSHpark (3 times this has happened) it was because there was a super tight/dense space and the etching didnt get all the copper.  They are probably way more sensitive to this than other fabs since they do big ass boards with many designs and i bet its easy to have issues etching something that size.   I think it boils down to getting a handle of what the fab says they can do and what they can actually do reliably.  I had problems with Seeed with my first order there and never went back, the etching was rough, the soldermask was poorly registered, just blah everywhere.  JLC i'll use for big stuff since their pricing is good but small stuff they have issues with clean screens even at their minimum text size spec.  PCBway has nice machines but they take a maximum X size of 110ish mm so big stuff gets pricey there too,  They cant do small text like OSHpark can on that machine.  So it's a mixed bag always where ever you go.  I go through a thousand boards a year and have yet to see a etching fault on any of the Chinese fabs which is why I dont use OSHpark anymore, it was a convenient service 5 years ago but the prototype biz in china has exploded and you can do much better for much less time and money.  Standard turn around for protos is 2 days at any place out there

works for me :)

Oh, in for sure.  I have clamshells for F405s to flash the bootloaders too

Oh this is great.  This was something I wanted to add along with the new aout im working on based on TI DAC8568 (8 channel part, same as used in O_C, Yarns, others)

awesome to see this done!

I've built a bit of experience with this and that euro module in the last year or so and been working on my own Aout in parallel and found it's pretty unsuitable in it's present state.  Namely: The bipolar circuit is referenced to the power rails and in a full euro cab, that is a VERY bad idea, massive noise ingress is the result making it useavle.  Removing that part of the circuit brings it back to very decent levels but 0-10V isnt terribly useful in euro.  Also, scaling the DAC outputs with a trimmer is a bit crude, per volt adjustments would be MUCH better (like in Ornament_crime or Yarns). My idea is to keep the MAX525s since they are available and decent parts and serial addressed but switch the analog output stage to that of Yarns or O_C (-3 to 7V or -3 to 6V outputs respectively) and port over the code for the calibration of those devices (whichever is easier).  The hardware side is covered but I really need someone who can code to deal with that end of it.  O_C is teensy 3.2 base but Yarns is STMF405 which should be very close to the current core code base.. I'll provide hardware to work with for any takers