Jump to content

latigid on

Frequent Writer
 View Profile  See their activity

  • Posts

    2,516

  • Joined

  • Last visited

  • Days Won

    147

 Content Type 

Posts posted by latigid on

  1. MIDIbox SEQ new frontpanel idea

    in MIDIbox SEQ

    Posted

    6 hours ago, tago said:

    How important are dual color LEDs for the new layout (per row)? What do they indicate? I assume using them on the top row is most useful, but i'm not sure.

    1st row normally shows triggered notes or the active step.

    6 hours ago, tago said:

    Do you think leaving them out and using normal single color LEDs for everything is a good idea?

    Probably not. How do you know where the current step is? How do you know what triggers are active?

    6 hours ago, tago said:

    How about inverting or fast blinking for single color LEDs? Is something like that implemented?

    Nope, but you can build your own firmware.

  3. Test Midi i/o module from MIOS studio?

    in MIDIbox SEQ

    Posted

    MIDI out LEDs are sending clock messages at a high rate, so they appear on all the time.

    Have you switched to the MIDI monitor page on the SEQ? The CCs from MIOS Studio may not be mapped to anything, so you shouldn't expect anything to happen.

    It shouldn't matter if the driver says GM5 or not. You might be able to uninstall it and get a fresh update when connecting USB. Also, the USB drivers shouldn't affect the DIN MIDI outs.

    Try to set the port after connecting your synth then initialise the track. It should fill 4/16 steps with C3 I think. Maybe you were sending notes out of range?

  8. MIDIbox SEQ new frontpanel idea

    in MIDIbox SEQ

    Posted

    Just now, tago said:

    Is it simply 1..16 on two top rows and bottom row + side panel like TK's graphic shows?

    Yes.

     

    Just now, tago said:

    I've another question about horizontal spacing between columns responding 1:1 to the display.

    If i divide 148mm (active area)/8 is 18.5mm h-spacing. Is this correct? Nearest on veroboard would be 7*2,54mm = 17.78mm, the 12mm encoder knobs would have only 5-6mm space between them. That sounds and looks too narow to me. What h-spacing should be used?

    I'm using 19mm spacing.

    • Like 1

  9. Displays not initializing after working for a while

    in MIDIbox SEQ

    Posted

    As explained above, the notch of the connector only matters when both PCB headers are keyed (allowing only one orientation). Considering putting the header on one end of the cable, the same pins are connected regardless of whether the notch on the IDC is "correctly" aligned with pin one (lower left as viewed from the top) or rotated about 180 degrees.

    But in TK.'s example above, rotating the cable about 180 degrees at the display end will mean the backlight circuitry will be where the power rails are supposed to be and vise versa, and this is not good for the LCD in most cases.

  12. MIDIbox SEQ new frontpanel idea

    in MIDIbox SEQ

    Posted

    Thanks for the positive feedback! Indeed, the limitation of this version is that it is 3U standard but sadly not Eurorack-mountable owing to the rails as @eptheca states.

    Here's an interesting compromise though:

    • The PCBs fit in a standard 3U panel, 85-86 HP width.
    • Use 1U tiles ~40HP (i.e. 4U/7U case) to mount the displays above.
    • The CVs/gates/clocks/triggers etc. could easily fit below the PCBs with room for a MIDI socket or two.
      • This wouldn't be too hard to interface and could even be hand-wired.
    • Still necessary would be mounting points (brackets?) for the panel and Core/peripheral PCBs.

    Personally I still think the power and space requirements of a full SEQ are suited to a desktop or 3U rack unit. But I can understand the wants and desires of self-containment and intermingling with the modular goodness. :)

  16. Displays not initializing after working for a while

    in MIDIbox SEQ

    Posted

    A common problem with Eurorack power headers is they only work if the notches are polarised the same way on both the bussboard and the module. If the module has "pin 1" on the opposite side as the power output header and both headers are keyed, there is no way to correctly plug in the cable.

    The Core schematic is correctly drawn as a "mirrored" header.

  17. Displays not initializing after working for a while

    in MIDIbox SEQ

    Posted

    It's easy to fry LCDs, e.g. if you get the backlight circuit going full blast onto the logic pins, reverse the power connector or a data input etc. I'd try another LCD. Ensure the cables are connected; it can be confusing without polarised headers (always missing from LCDs). Don't trust the notch on the Core board, use the stripe of the cable to align the power or backlight. 

  18. LED Driver and Output Board for SEQv4 DOUT

    in MIDIbox SEQ

    Posted · Edited by latigid on

    NPN transistors don't source current very well. I'd suggest moving the diode in series with the resistor on the collector and tying the emitter to 0V. This way the current can be controlled with R1, otherwise it's not doing much. The capacitor you've shown in the Falstad sim won't do anything. R3 isn't necessary if you have the 220R in place. D1 will block reverse voltages but will also drop the gate voltage. Voltage < 0V will pass through. As long as the current is limited the 595 output will probably be okay with another output connected, even excluding D1. Diode clamps are better done in parallel with the node to protect, diodes connected e.g. to the power rails.

    I'd suggest testing the circuit on a breadboard or perfboard/stripboard before ordering the PCBs.

×
×
  • Create New...