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Everything posted by Altitude

  1. dipCoreF4 and dipBoardF4, a compact Core.

    My new euro module:
  2. dipCoreF4 and dipBoardF4, a compact Core.

    and thats why we run prototypes :)     
  3. dipCoreF4 and dipBoardF4, a compact Core.

    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
  4. dipCoreF4 and dipBoardF4, a compact Core.

    works for me :)
  5. dipCoreF4 and dipBoardF4, a compact Core.

    Oh, in for sure.  I have clamshells for F405s to flash the bootloaders too
  6. MIDIbox SEQ V4 Release + Feedback

    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)
  7. awesome to see this done!
  8. 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
  9. Addon: MB6582 Mixer

    So after years one planning to do this, I finally got around to it.  Here are the results: Simple TL074 based mixer with stereo pots for each channel that fits to the existing holes.  I've got a handful of boards if anyone would like one and then I'll post a OSHpark link so anyone can get them any time. Boards:   BOM
  10. Moog case is a no go if you want stuff on the back, it has fins inside that cause problems. Ill post some pics shortly
  11. !Sold! [FS/D] (backup/unused) SEQ V4 with TPD

    fine looking device.  Out of curiosity, how did you do the laser cut button caps?
  12. One MB-6582, One Power Supply: a Tutorial

    i've done it both ways and I dont see any difference one way or another.  If I had to do it again, I'd use the 7809, cheaper and smaller. One thing I'd recommend (unrelated to this question):  DONT use the E series recoms, they are super cheap for a reason and not well suited for audio applications,  Output noise is unacceptably high 
  13. This is based on a previous design I had used in the past with some improvements (smaller size, switching 5V reg).  Its a 7VA trafo which gives 580 mA max, not a lot but enough for my needs (size was the big factor here).  Standard 7812 and 7912 linear vRegs with a switching Recom R-785.0-0.5 for the +5. Total cost was ~$50 including the board.  If anyone is interested, I'll post the BOM and eagle files    
  14. The FPGASID Project

    It would be cool if they could shrink it down to SID size, those are machine stuffed anyway so no reason not to go to a TAG programming header, 0402 passive, small as possible everything else (underneath?)
  15. Addon: MB6582 Mixer

    payment requests sent. Here is the BOM
  16. AOUT Euro - PCB set

    So it is time to offer a bulk order of these boards.  This will be a PCB only set consisting of the DOUT/Jack board and the Aout module that mounts on the back of it.  I could also offer this with the liner driver receiver if there is interest for it and possibly a PCB euro panel. The module does this: 3x DOUTs for 8 5V gates, 8 clocks, and 8 Triggers 8x CV Channels via the MAX525 DAC with the Bipolar offset option. There will be an additional DOUT/DIN header on the board for linking to a Euro TPD module down the line   The module is provisioned to be powered via 10 pin euro power header with the +5V being supplied either by the module itself or from the line extender.  I tested both ways without noticing a difference but do recommend that it be powered internally. Pricing will depend on how many people order but expect ~ $30 for the set of just the DOUT/Aout boards  Sign up here: Also, a warning:  This is an all SMD board, 0603 size passives, SOIC opamps,  and the MAX525s are SSOP size, if you dont have experience with soldering parts like that, I recommend getting some practice boards off ebay until you are comfortable.  This is not a beginner's surface mount project.   Boards will be made by PCBway.  I can get ENIG plating or leaded HASL.  Leaded HASL is much better to solder to but is not ROHS compliant so input would be appreciated on that.           
  17. I just stuck a darkly tinted window, it obscures the depth..  There is no way to go in front of the PCB, it will interfere with the tacts
  18. Addon: MB6582 Mixer

    i'll PM ppl for the ones I have, $5 a pop.   I'll post an OSHpark project later..
  19. Powering SEQ with USB Hub problem

    I think that there is something else pulling it down, I run mine on USB power all the time when I'm flashing it, check resistance between +5 and gnd and +3.3 and ground
  20. Powering SEQ with USB Hub problem

    There may be current limiting stuff on the discovery board too
  21. Addon: MB6582 Mixer

    no, just havent had time to deal with this..
  22. Addon: MB6582 Mixer

    I like the feedback as well but its REALLY cumbersome to use the MB6582 with a 8 channel snake out the back.  I used a single supply with TL074 running off the 9V     
  23. Addon: MB6582 Mixer

    Correct.  There are 2 ways to wire this in, pre the jack which will just mirror what's coming out of the channel or post jack by puling the 10ks in the passive mixer so the SID pair is removed from the mix when you plug something in
  24. Time for my next MB

    Mouser stocks Vishay OLEDS which are rebadged raystars..
  25. [WTB] GM5x5x5 PCB

    in the US.