latigid on

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  1. Troubleshooting midiphy SEQ v4+

    Thanks for the follow up! You're certainly not to blame for this, so I'll ask the fab what happened. Looks like the copper substrate was scratched from the beginning or some of the mask rubbed off before etching. Let us know privately with any subsequent order and we can spare you some $$ for the trouble.
  2. Control LEDs without HC595

    I think you need to define your parameters. How many LEDs? How many spare I/O or GPIO can you use? Does an LED matrix with multiplexing go far enough?
  3. Troubleshooting midiphy SEQ v4+

    Hi Adam, I don't fully get it: are you able to illuminate both superflux LEDs (red) in this column? Also, is it the _L or _R board and what is the version number? You can see the board trace should connect all "red" LEDs in this row, but the SJ part will not be connected to the LED until the resistor is placed. This sets the output for the MEC LED but you were talking about superflux?   I can see a scratch on the board in your picture, is it related? If you're feeling masochistic you could sand back the solder mask and see where the copper stops (if it does). If the trace I marked with a "?" really doesn't connect, I would suggest to use a 1k THT resistor as indicated with the red mark. It would also be possible to use one of the 2/3 positions, but the matrix addressing will need changing in the HWCFG file.  
  4. Quad IIc Midi R2 PIC Firmware

    You're welcome. Device IDs are hardwired using IO pins directly on the PCB (or selected with jumpers on oldschool I2C modules).  
  5. Quad IIc Midi R2 PIC Firmware

    Here you go: is the parent page with all info.
  6. midiphy SEQ v4+

    I mean RS-422 is supposed to drive almost a mile, but I'm not sure if the MIDIbox would like that :).  
  7. midiphy SEQ v4+

    Hi, We currently use this one from Reichelt: TK. suggests up to five metres (so <15') would work but I haven't heard otherwise yet.
  8. crimic - hamsterrad (art-music video)

    Might be my favourite one so far!
  9. midiphy Eurorack Expander Modules

    Hi Paul, The modules should be compatible with all Core versions. The digital gates etc. were typically done with GPIO pins for older Cores. Best, Andy
  10. Impressive and elegant design crammed into a DIN socket with a 3.5mm jack output.    
  11. IC not available anymore

    You cannot substitute for HC logic in this case. HCT is required to level-shift the logic to +5V, whereas a 3v3 3V signal pushes the threshold limits of a HC chip powered at +5V. 595-SN74HCT541N should be suitable.
  12. midiphy SEQ v4+

    True as far as I understand the structure of the chips, though I think the maximum current drawn could be 150mA per chip IIRC? Normally if they are overloaded the supply voltage begins to sag. In this case it's academic though, as we use bipolar driver transistors for both sides of the matrix. So the actual current could be somewhere near the ohmic value.
  13. 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 :-).  
  14. 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?
  15. 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.