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Developing the Super Sixteen Step Sequencer (eurorack)
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author Developing the Super Sixteen Step Sequencer (eurorack)
Hello wigglers!
I've been developing a new sequencer module for eurorack I call the Super Sixteen, and have recently completed the first engineering prototype. There's still lots to change and fix before it's ready for primetime, but I thought you DIYers would be interested in the design/dev process, which I've been documenting in a series on Youtube.

It's designed primarily as a monophonic bassline and melody sequencer with pitch, gate and CV out. I plan to add patch memory and will include scale selection, motion recording, and portamento.

The sequencer is open-hardware, built on the Atmega328p microcontroller, and was prototyped with Arduino Uno. If you're interested in developing a CV module with Arduino, the information in the first few videos will be helpful in getting started. I'll try and update this post with progress as it gets developed, but here are the videos I've made so far. Enjoy, and let me know if I can clarify anything or if you have any suggestions on the design so far!

Read the code and get the KiCad files on Github:

Super Sixteen Youtube Series:

  1. Designing a Eurorack Sequencer - Pt. 1: Digital to Analog Converter and Amplifier
  2. Designing a Eurorack Sequencer - Pt. 2: Seven Segment Displays
  3. Designing a Eurorack Sequencer - Pt. 3: LED/Button Matrix
  4. Designing a Eurorack Sequencer - Pt. 4: PCB Prototyping
  5. Designing a Eurorack Sequencer - Pt. 5: Assembly and Testing
  6. Designing a Eurorack Sequencer - Pt. 6: Front panel & external sync
  7. Designing a Eurorack Sequencer - Pt. 7: New PCBs, Motion Recording

First video in the series:

The front panel layout of the sequencer (concept art):

Wow. Good work
Looks cool. I look forward to watching your progress.
Great stuff, I hope you will keep going with it!
Looking good! Following your progress Guinness ftw!

Edited: that upverter app looks ace
we're not worthy applause thumbs up thumbs up thumbs up
Looks good!!! I'm interested smile
My sketchy handmade prototype board gets a sketchy handmade faceplate! Abe from AI Synthesis pointed me in the right direction for getting proper panels made so I'm learning how to design and spec those now. The next version will be prettier, but I'm quite fond of the crusty synthpunk look for this one. Rawk!

The pots are way too close together, even more so with the knobs on. At least they look nice!

"Character" :-D

Knob spacing is a tough one to learn. I wouldn't say I have it down yet.

Good job, keep going!
Good work!

Trouble with knob spacing but 5 U is too big, 4U is the answer
i can't say i'm much of the sequencer type, however it's great to see someone else working on a project they think is worth making. i'm very touchy about control distances myself. i find that much of what's in euro-rack feels too squeezed together. so, this doesn't look TOO off of what most people consider to be appropriate. looks good so far!

my advice is to try to find a balance between comfortable space, and not being wasteful about space as well. it's just my analysis that euro-rack generally has an over-emphasis on bragging about smaller spaces. what matters more in the end is if it feels like the spacing is correct. maybe your module will end up being bigger than what you've got here. don't take anything i say as discouraging! i'm optimistic that you will find a way to bring it to fruition

Update time! The prototype module is outfitted with a fabricobbled faceplate, and the software is upgraded with external clock sync, pitch calibration, and glide/portamento. It's a mean, lean, acid machine!

Designing a Eurorack Sequencer - Pt. 6: Front panel & external sync

Ive never seen such a nice detailed look at all the steps that go into something like that. Awesome.

Thanks for posting these videos.
this is cool! ill be making one when its ready SlayerBadger!
Second revision PCBs just arrived! Took some commenters' advice and moved to a 2-board "backpack" arrangement so I could space out the controls a bit better. Still need to assemble and test.

These are all through-hole for convenience, but I'm considering going to SMD for parts like micros and resistors and tact switches - should make PCBA easier. Would use SMD LEDs but I'm not sure if there's a good light-pipe system that duplicates the look of THT LEDs - anyone have any experience with that?

Anyway, I have to build one of these and reprogram everything for the new boards, then I can think about revision 3. In the meantime I'm traveling a bit including a stop by KiCon in Chicago on April 26-27, so say hello if you see me there! After that should be a new video and update to the github repo with the latest code and board files.

Latest video is out now! The new PCBs are assembled and the totally-rewritten software is up and running. Some changes in the PCB make it much easier, like the component layout and new ICs. The boards need a few small fixes, like transistor swaps and missing RESET links, but the sequencer lives!

I also took this opportunity to add some new features, namely motion recording for quick entry of new sequence ideas, and adjustable beat repeat for on-the fly jamming. If you have ideas for momentary effects to add on that button, let me know! I was thinking of adding reverse mode, auto-glide, and octave shift as additional momentary effect options (accessible by holding the effect button and turning the encoder).

Next I need to fabricobble some faceplates and finish up the software, but I'm traveling the next couple months so I'm working on a portable synth setup I can bring with me. New video on that soon.

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