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latigid on

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Posts posted by latigid on

  1. Troubleshooting midiphy SEQ v4+

    in MIDIbox SEQ

    Posted

    38 minutes ago, synaptech said:

    I got the JA board up and running this morning, all the buttons and encoder seem functional!

    Very good!

     

    38 minutes ago, synaptech said:

    The LeMEC boards are a different story:

    On the left LeMEC board it seems like all the buttons (encoder press and matias switches) don't register, turning encoders left and right behaves correctly.

    At a guess, R26 is missing, or IC6 is installed without R17/C7. Presumably you haven't tested LED functions yet? 

    I can provide more help when I see a picture of the board.

     

    38 minutes ago, synaptech said:

    On the right LeMEC board all of the buttons seem to work as expected, turning encoders works on all encoders except on encoder 16.

    Do the encoder pins contact the pin header below? Try trimming the pins, also isolate with a bit of tape.

     

     

     

  4. Troubleshooting midiphy SEQ v4+

    in MIDIbox SEQ

    Posted

    At first, maybe try to keep J3 jumpered and see how the performance is.

    You can think of the J8/9 SRIO chain (or J19 SPI) like a power buss, so if there is a power supply connected to the cable, the chips on the line driver will receive power that way. But if you think of where that power comes from it goes all the way back to the Core USB connector. Thus there is the option to unjumper J3 and supply the MIDIbox buss internally (like in a Eurorack case). This was not thought through extensively before, which is why I've designed something much more suitable for racking in a case, with lots of different power options (still needs testing but should be available soon).

    One option for a separate +5V is to put the J19 connector somewhere in the middle of your ribbon. The first four wires are 0V|0V|+5V|+5V, so if you have a PSU handy you could connect those there. J3 should be unjumpered in this case. AOUT_NG would share the same +5V. This buss-power regime is not optimal, but it seems to work okay. Better would be to "star wire" each PCB back to the source PSU; that way the return currents should interact less.

  5. Troubleshooting midiphy SEQ v4+

    in MIDIbox SEQ

    Posted

    Hi,

    Actually, your usecase is more like this:

    mbhp_line_driver_usecase_mbseq.png

    As no serial inputs (switches) are used, the J2_SI setting is not important. If you use an AOUT_NG, then JAOUT offers 1:1 pinning, but it overlaps with the LINE_RX J19. The pinout is as shown in the ucapps schem.

    If you've already soldered J19, you can rearrange the ribbon cable as shown:

    fetch.php?media=seppoman:aout_ng_end.jpe

     

    Thereafter use the top row (opposite side to the notch in the header) to connect to AOUT_NG J1. The other side is connected 1:1. These days I would put the black cable on the other way, but it doesn't really matter.

     

    For midiphy LINE_RX, I recommend to use a dedicated +5V supply and leave J3 unjumpered. The ICs use quite a lot of current (100 ohm terminators), which isn't transmitted well down a DB-25 cable.

     

    Any other questions please ask.

     

     

  6. LoopA V2 Introduction, Features & Support Thread

    in MIDIbox User Projects

    Posted

    Peter can correct me if I'm wrong but the workflow is:

    Clip: a recorded passage of notes (maybe data)
    Track:  where clip data is stored. There are six tracks per scene
    Scene: a collection of six tracks. Mute states will also be stored, so you can build up layers dynamically.

    One workflow is to copy clips onto different tracks and flick between scenes to create variation. E.g. if you wanted to drop out all of the tuned instruments and keep the drums going, then build up the parts manually by unmuting them (could also be done within a single clip). Or copy the track and transpose a perfect 5th etc.

    I would say it's not meant to be a whole DAW in a box. The idea is to use it as a quick "sketchpad" jamming tool, although Peter has come up with some very inspiring songs using not much more.

     

  8. Troubleshooting midiphy SEQ v4+

    in MIDIbox SEQ

    Posted

    Thanks for the photos. From the looks of it, you didn't use that much solder on the LEDs. Did you try reflowing them?

    What is the forward voltage of the LED? If it is too high, it could indicate that the soldering temperature was too hot. As everything else works, I don't see how it could be anything else (maybe a broken trace or pad shorted to 0V). Just swap the LED in this case.

    Hence: manually connect the column  of the upper red LED to the lower one. If the LED lights, then there is a missing connection between RJ6_1 and the LED. Also test for continuity between the red anode pad and 0V (ground).

    Relevant parts of the schematics attached.

     

    lemec_blm.JPG

    lemec_col5.JPG

    lemec_RJ6.JPG

  9. Troubleshooting midiphy SEQ v4+

    in MIDIbox SEQ

    Posted

    A photo would be useful. So the other LEDs of the column light up? MEC and the other superflux? Also nothing else gone in the row? 

    Is the cathode pin correctly soldered? 

    Do the DINs work? 

    When you say you've isolated the LED, you removed it? Did you try one of the spare parts? 

    You could try to temporarily short to the other red LED in the column or the adjacent cathode in a row. 

  10. Out-of-stock parts for midiphy BOM tool

    in MIDIbox SEQ

    Posted

    I updated the midiphy BOM tool to reflect the "single quantity" Mouser item. I think this wasn't the case before (as I've ordered single quantities using the same part/link), so my bet is Mouser "updated" that part to require MOQ 25. Did you ask them if you can return them for a refund or credit?

    Once again, sorry for the trouble! You could have a whole studio of equipment with your Cores in one corner and the control surfaces in another :).

     

  12. Out-of-stock parts for midiphy BOM tool

    in MIDIbox SEQ

    Posted

    Digikey has lots of stock, Mouser looks to receive a delivery on 2018-02-04. 

    If it's super urgent, consider buying the 11-pin version (MDF7-11S-2.54DSA(55)). It might work just to offset the pins one row, but another option is just to cut the edge/last position off if it gets in the way of the mounting hardware.

  13. midiphy SEQ v4+

    in MIDIbox SEQ

    Posted

    11 goes to the nearer encoder leg. If it's more convenient, just bridge the encoder leg closest to the RN to pin 9 on the resistor network. As long as the bottom trace is still okay, the pull-up just goes the long way around.

    5c47bb98b74cb_resistorbodge.thumb.JPG.c1

  14. midiphy SEQ v4+

    in MIDIbox SEQ

    Posted

    The good thing about the resistor networks is they aren't hugely sensitive to heat. CMOS chips on the other hand...

    I would also recommend a hot air station. I have something similar to what Bruno linked, but the fan is in the main box rather than the "nozzle".

    They're useful for other things too, like desoldering (or soldering) large metal parts like heatsinks, pin headers or jacks, or when the PCB designer doesn't use thermal isolation pads on parts attached to the 0V plane.

    I even made crème brûlée with it once! :blush:

    • Like 1

  15. midiphy SEQ v4+

    in MIDIbox SEQ

    Posted · Edited by latigid on

    This could work too. Though, there may be a risk that you end up ripping of the SMT pads with the force.

    You could ask @rbv2 as he had the same issue. A lot of solder/Chip Quik? Maybe even using a lot of solder to immoblise each pin (effectively binding each pin together with solder or even using scotch tape), then clipping?

  17. midiphy SEQ v4+

    in MIDIbox SEQ

    Posted · Edited by latigid on

    Glad that you got it sorted! 

    Either a hot-air reflow station or TK.'s special trick with a thin wire underneath the SOIC is recommended (this was done for harvesting old chips used in OPL3 modules).

     

  18. midiphy SEQ v4+

    in MIDIbox SEQ

    Posted

    Pictures? You can also use the dedicated thread here:

    • Did you solder in an isolated resistor network rather than a bussed one? Is the polarity correct?

    The random data might indicate floating 165 inputs.

    Other ideas:

    • Try also with set debug on to see the actual SR positions.
    • Is the NG file the LH one, assuming no other boards are connected?
    • Is there any conductive flux residue left around the pins?
    • Are you using the wCore or something else for testing?
    • What is the length of the ribbon cable?

    BLM positions are here. SR side is as you would expect, but also attached here for convenience.

    Best from snowy Boston,
    Andy

    JA_BLM.JPG

  20. midiphy SEQ v4+

    in MIDIbox SEQ

    Posted

    12 hours ago, Menzman said:

    Hi everyone,

    just finished my first V4+!

    -->Big thanks to Peter and Andy for their great work (and support) to make this machine happen! 

     

    After playing around for some hours I found out one issue with my build: Always the eights encoder (8 & 16) do not react as expected. The encoders are jumping in the wrong direction and also opening random-like pages/functions when using them. :-(

     

    Great work and nice pictures! 

    Are the encoder pins in question shorting out on  the pinheaders below? If so, trim the pins a little.

     

     

    9 hours ago, gbrandt said:

    Hi Peter,

    I'm happy I can contribute a little bit back after lurking all those years :-)

    Concerning the LED, i've marked it in red now which means parts where people should be careful in replacing.

    And I checked my previously bought MIDI ports again from both Tayda and Mouser and it's true Tayda seems much cheaper and doesn't have a nice metal casing. I marked those, too.

    Another thing I noticed, not related to Tayda, is that the MEC switches are out of stock at Mouser now. too many SEQ V4+ builders? :-)
    I did find some at RS so might order from there (unless someone has a huge stock and wants to make a nice offer),
    but i'll eventually add more columns for other vendors

    Cheers,

    Gerhard

    I'd recommend Reichelt for MEC switches. Conrad also sells them, and the caps I think are cheaper there.

  25. CORE_STM32F4 Module, LCD, and fire

    in MIDIbox Documentation Project

    Posted

    When you look at a male IDC pinheader from the top, the pins are numbered  

     ________________________
|02 04 06 08 10 12 14 16 |
|01 03 05 07 09 11 13 15 |
__________----___________

     

    Because we normally connect displays on the rear side, the Core J15 is mirrored, so it's actually 

     ________________________
|16 14 12 10 08 06 04 02 |
|15 13 11 09 07 05 03 01 |
__________----___________

     

    Thus the pin numbering starts at 01 in the bottom right corner.

    Could you check that these pin numbers correspond to those on the LCD when the cable is connected (with the power off)? Or are the pairs inverted as Bruno says?

    Otherwise the pinning on the LCD (unless it's mislabeled) looks to correspond to the Hitachi standard. 

     

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