latigid on

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About latigid on

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  1. midiphy SEQ v4+

    Four hours of stress testing just done. In MIOS Studio "set dout x 1" where 0<x<7 inclusive sets the sink sides active and  "set dout y 0" where 8<y<15 inclusive sets the source sides active. I tested a mixture of red, green and mixed LED colours. No burn out or overheating of any parts. Colour and brightness after the test are identical to those of a non-stressed board (running in normal multiplexed mode for both). This doesn't mean that you should run your matrix like this (and if you did you would lose control over LED and switch registration), but it shows that a "failure" with the LED drawing the full theoretical current will not instantly damage the LED. At least there will be enough time for you to notice and reset the unit :-).  
  2. midiphy SEQ v4+

    No worries! I know Peter and a few others ran a mixed colour scheme and it seemed to work out well, though the current drive through the LEDs might get a bit non-linear I think. Stress test is currently running with the "worst-case" matrix fully on, so no multiplexing. Half an hour in and nothings burned out yet. What do you think is a fair test time?
  3. midiphy SEQ v4+

    If you're concerned with the LED lifetime then simply increase the values of the RJ resistors to a current you are comfortable with. I would consider the probability of an LED matrix "freezing" in the way you describe as a low risk though.  
  4. midiphy SEQ v4+

    Not sure if this is a grumbling post about schematics not being supplied? You bought the PCBs, so you are welcome to the schematics if you send an email in reply to your order confirmation. Snippets of the schematics are supplied in part throughout the troubleshooting thread. This is generally a better way to provide targeted help to builders and I'm very responsive in that regard. So, rant over! :-) If that wasn't your intention, then I'm sorry. The LEDs are indeed multiplexed as is typical for MIDIbox projects and driven through bipolar transistors. The key datum is actually the peak forward current per chip, listed as 100mA. True, our multiplexing speed and fraction is slower and larger than the given conditions. All of the LEDs have been put through a burn-in test using the same circuit as the one in the SEQ, so we know that they are good. Also, these are superflux LEDs with much higher current-carrying capacity than your typical LEDs. Have fun building!
  5. midiphy Eurorack Expander Modules

    Hi, We currently use this one from Reichelt: TK. suggests up to five metres would work. So I guess that means six feet in Freedom Units. Unfortunately I couldn't find a decent one from Mouser but if you need to get all of your parts there,  571-1658613-2 plus 26-way ribbon could do the job (and would be less bulky than a cable). Another famous sequencer does it that way :).
  6. blm 16x16+x Costs - Calculation

    It's getting there! Next in the pipeline is the LoopA, then the BLM.
  7. The J16 port is physically the same on the wCore, the E part just breaks out the LEDs (GPIO) and reset switch to the panel. The Waveshare board of course might have layout differences compared to the Discovery. The pull-up resistors for the J15 display port required changes that I didn't fully investigate, but it works so I'm happy :).
  8. STM32 F4 AIN problem

    I've reached the end of where I could offer help. If it was working before, switch back to a previous firmware version? I think TK. modified _NG to accommodate mixtures of AIN ports as inputs and outputs, so maybe something to do with that! Best of luck, Andy
  9. STM32 F4 AIN problem

    Sorry, I see F4 in the title now. What version of _NG? If it's a recent version try an old one and vice versa. Could be a software bug. From a hardware perspective it might be that your analogue voltages are out of range? I.e., greater than 3V? If the MCU freezes it might have run out of memory and needs a hard reset. But reset from MIOS Studio typically doesn't work especially on Windows, or at least a restart of MIOS Studio is required. Personally I don't see the merit in using AINSER and AIN (MCU). The offboard ADCs are much better with far less jitter than the onboard ones.
  10. STM32 F4 AIN problem

    F1 or F4 Core? AIN (MCU pins) or AINSER8 or AINSER64? I presume MCU. ?? What build version of _NG are you running?
  11. The HAARP, an Hardware Advanced Arpeggiator.

    If you didn't already, add jumpers to the CAN pins in case the buss is used in the conventional manner (CV/gate). Putting a high-speed digital signal on the power cable might introduce some crosstalk and should be tested.
  12. midiphy Eurorack Expander Modules

    Hello, Glad it worked out better this time :).  I personally don't use the min/mid/max calibrations but rather the 0V--10V. If you switch the channel back to off and then try another does the issue remain? Could be a software bug perhaps, but if you can calibrate I think it's fine. Best, Andy
  13. [Pending Sale] MidiBox Seq V4 with BLM 16x4 and CV/Gate

    Agreed, well done!
  14. midiphy-cv-in-4ms-case1.jpg

    Now we just need to do black panels to match the case