The kxmx_bluemchen - An open source, 4hp, Daisy based Eurorack module

haemmerchen93 · November 2, 2021, 4:10pm

Hey there!
Great Project, really intersted in a Modul.
How can i order prebuilt modules or PCB’s ?

Cheers

recursinging · November 8, 2021, 8:56am

Hi everyone,

I’ve almost exhausted my stash of parts. I have enough for 5 more kxmx_bluemchen (no more nechmeulb) DIY kits/modules in 3u/1u. Unfortunately I’m out of Daisy Seeds, so the last five will have to be BYO Seed. If anyone here is still interested, fill out my registration form, I wont be doing another run any time soon.

edit: They’re all now spoken for, so I’ve disabled the registration form.

Thanks to everyone that got a kit or module, I hope you make something beautiful with it, and if you do/did, please share it!

Manysounds · November 11, 2021, 2:27pm

Thank you @recursinging, this unit is exactly what I wanted for a multi-effect slot in my rack, intended to be my own custom Happy Nerding FX Aid in the 3u size and a “master processor” with Dirt/EQ/Compressor in the 1u.
Here’s the first thing I made, before I re-examined my approach to how to deal with the +/- CV vs Knobs. (which will end up being a “select a parameter to attenuvert” thing)
It’s a quick and dirty Oopsy~ multi-effect that I made to test my build: delay, a reverb with dirt, and a 2-16 stage super adjustable phaser.
More to come!

DieterLaser · November 14, 2021, 12:00am

somehow the scroll function doesn’t work, when i have more than 4 gen~ patches on my bluemchen. it scrolls down, but the screen is not following. it works fine, when i have more than 4 parameters that i want to edit. is this a general bug?

recursinging · November 15, 2021, 12:13pm

I don’t know what the default behavior is on the Patch/Field, but it sounds like it might have to do with the smaller screen dimensions of the bluemchen/nehcmeulb. I’d suggest opening an issue in the Oopsy github repo.

antisvin · November 25, 2021, 7:19pm

If anyone was dying to run OWL patches on bluemchen, be my guest

Tom · November 25, 2021, 7:23pm

Ohh I miss this train !
@recursinging any plan for a new batch ?

recursinging · November 25, 2021, 8:59pm

That’s awesome, thanks for the port!

Sorry, not in the near future.

100k · February 2, 2022, 12:49pm

Bluemchen is working wonderfully so far, thanks a lot @recursinging!

Naïve question: Is it safe to have it powered via the eurorack PSU and connected via USB at the same time, or should the rack better be off?

Cheers!

antisvin · February 2, 2022, 2:52pm

It certainly is safe

recursinging · February 2, 2022, 3:17pm

As @antisvin wrote, it is fine to connect your Eurorack power and USB at the same time.

If you’re developing in C++, do yourself a favor and get a STLINK-V3MINI - using that you can flash your seed without needing to press any buttons, and you can leave your bluemchen racked.

sanderbaan · September 11, 2022, 12:53pm

@recursinging I would like to order a board with SMD parts soldered at JLCPCB.com and I tried to put an order using the files from your website:
https://kxmx-bluemchen.recursinging.com

All good until the point where you select the PCB Assembly. It asks for the BOM but also for a Pick&Place File(CPL) file which is not on your website. I tried creating this from within EasyEDA but that did not work as it is not placing the components on the board in the 2d/3d overview. Are you able to help me or provide with me with a correct CPL file which works with the Gerber files from your site?

Thank you!!

Best
Sander

recursinging · September 12, 2022, 8:15am

It’s been over a year since my last PCBA run, so I’m not up to date on it any more. If I recall correctly, it was pretty buggy and challenging to get the order right, but maybe it’s better now. I’m not sure why you’re not able to generate a valid CPL file, but for reference, here’s one that I just generated.:

github.com

recursinging/kxmx_bluemchen/blob/gh-pages/media/kxmx_bluemchen_back_CPL.csv

Designator	Footprint	Mid X	Mid Y	Ref X	Ref Y	Pad X	Pad Y	Layer	Rotation	Comment
"C1"	"C0603_MINIMAL"	"6.35mm"	"-18.92mm"	"6.35mm"	"-18.92mm"	"7.2mm"	"-18.92mm"	"T"	"180"	"47pF"
"C1"	"C0603_MINIMAL"	"26.13mm"	"-18.92mm"	"26.13mm"	"-18.92mm"	"26.98mm"	"-18.92mm"	"T"	"180"	"47pF"
"C1"	"C0603_MINIMAL"	"45.91mm"	"-18.92mm"	"45.91mm"	"-18.92mm"	"46.76mm"	"-18.92mm"	"T"	"180"	"47pF"
"C1"	"C0603_MINIMAL"	"65.69mm"	"-18.92mm"	"65.69mm"	"-18.92mm"	"66.54mm"	"-18.92mm"	"T"	"180"	"47pF"
"C1"	"C0603_MINIMAL"	"85.47mm"	"-18.92mm"	"85.47mm"	"-18.92mm"	"86.32mm"	"-18.92mm"	"T"	"180"	"47pF"
"C2"	"C0603_MINIMAL"	"3.81mm"	"-23.24mm"	"3.81mm"	"-23.24mm"	"2.96mm"	"-23.24mm"	"T"	"0"	"560pF"
"C2"	"C0603_MINIMAL"	"23.59mm"	"-23.24mm"	"23.59mm"	"-23.24mm"	"22.74mm"	"-23.24mm"	"T"	"0"	"560pF"
"C2"	"C0603_MINIMAL"	"43.37mm"	"-23.24mm"	"43.37mm"	"-23.24mm"	"42.52mm"	"-23.24mm"	"T"	"0"	"560pF"
"C2"	"C0603_MINIMAL"	"63.15mm"	"-23.24mm"	"63.15mm"	"-23.24mm"	"62.3mm"	"-23.24mm"	"T"	"0"	"560pF"
"C2"	"C0603_MINIMAL"	"82.93mm"	"-23.24mm"	"82.93mm"	"-23.24mm"	"82.08mm"	"-23.24mm"	"T"	"0"	"560pF"
"C3"	"C0603_MINIMAL"	"6.35mm"	"-27.56mm"	"6.35mm"	"-27.56mm"	"7.2mm"	"-27.56mm"	"T"	"180"	"100nF"
"C3"	"C0603_MINIMAL"	"26.13mm"	"-27.56mm"	"26.13mm"	"-27.56mm"	"26.98mm"	"-27.56mm"	"T"	"180"	"100nF"
"C3"	"C0603_MINIMAL"	"45.91mm"	"-27.56mm"	"45.91mm"	"-27.56mm"	"46.76mm"	"-27.56mm"	"T"	"180"	"100nF"
"C3"	"C0603_MINIMAL"	"65.69mm"	"-27.56mm"	"65.69mm"	"-27.56mm"	"66.54mm"	"-27.56mm"	"T"	"180"	"100nF"
"C3"	"C0603_MINIMAL"	"85.47mm"	"-27.56mm"	"85.47mm"	"-27.56mm"	"86.32mm"	"-27.56mm"	"T"	"180"	"100nF"
"C4"	"C0603_MINIMAL"	"11.43mm"	"-18.92mm"	"11.43mm"	"-18.92mm"	"10.58mm"	"-18.92mm"	"T"	"0"	"100nF"
"C4"	"C0603_MINIMAL"	"31.21mm"	"-18.92mm"	"31.21mm"	"-18.92mm"	"30.36mm"	"-18.92mm"	"T"	"0"	"100nF"
"C4"	"C0603_MINIMAL"	"50.99mm"	"-18.92mm"	"50.99mm"	"-18.92mm"	"50.14mm"	"-18.92mm"	"T"	"0"	"100nF"
"C4"	"C0603_MINIMAL"	"70.77mm"	"-18.92mm"	"70.77mm"	"-18.92mm"	"69.92mm"	"-18.92mm"	"T"	"0"	"100nF"

This file has been truncated. show original

I had a look through it, and it seems fine to me. I removed all the through hole components. Maybe that will work better for you?

Wizard · November 13, 2022, 5:26am

I have had a daisy seed sitting around forever and just came across this project. This module + Oopsy would really give me something to chew on!

Is anyone considered doing a JLCPB run of smd pre-soldered pcbs for this any time soon? I would defs be up for purchasing a pcb set

recursinging · November 16, 2022, 11:27am

I have a couple of PCBs and some of the ancillary parts left over from my last run. PM me if you’re interested.

adamtindale · November 21, 2022, 7:55pm

I have recently received an order of boards from JLCPCB and am in the process of acquiring parts to make kits. I’m planning to build one up this week to test. Please let me know if you’d like some, I have plenty!

Manysounds · November 21, 2022, 8:45pm

I think I’d love another 4hp original. Maybe two.

jaradical · November 22, 2022, 7:45am

I’m pretty late to this party, but if anyone is making new kits I’d certainly be interested.

Cheers

adamtindale · November 26, 2022, 12:53am

I’ve built one up and it appears to be working! I’ll put some firmware on it to test this weekend, take some pictures, and then start ordering parts to have kits. Please let me know if you would like a kit or a built module.

ohthepain · December 1, 2022, 3:46pm

I will take it either way, kit or assembled.