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Eurorack modular synthesizer modules
by Amplivibe, published
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I recently started a modular synthesizer. Started with some modules from Doepfer, but I soon wanted more. It is modular, so I decided to build some modules myself. Some good ideas can be found on the Doepfer DIY (http://www.doepfer.de/DIY/a100_diy.htm). I started with some simple passive modules, a multiple, an OR gate and an AND gate. I ended with a Slew limiter and an Arduino Uno controlled module! The Arduino module is a VCO / Clock Divider / program it yourself. See it soon on my blog at jh-interact.blogspot.nl !
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It's a MendelMax 1.5
Currently mostly printing with PLA
The HP=5.07 means an 84HP plate is 425.88mm between mounting hole centers.
Its actually 426.72mm (only 0.84mm but 3mm screw will deform the hole to go in).
IMHO you might want to update the HP to be 5.08...?
Have you seen the Barton Musical Circuits modules? He sells PCB's for them for $8 and you can print a panel. He gives the complete schematics and parts list in PDF files for each:
http://www.bartonmusicalcircuits.com/synthstuff.html
The BMC018 analog drum is pretty popular along with some others
EDIT: Another interesting module you can make yourself: Ardcore
http://20objects.com/ardcore/
How to build the ardcore from scratch including parts list:
http://20objects.com/ardcorediy/
They sell these for like $230 assembled wow.. can mkae much cheaper. And don't even have to buy their board .. just wire it all up on some perf board? :)
This is awesome. How do I get started with Eurorack? Can I start with one module? Which is the first module I should get or build? I know eletronics and can design stuff in cad
Hi. I think the starting point is getting a case and power supply. It is quite expensive in my opinion to get started at all - a basic diy power supply from doepfer and a case costs about 150 euros. From there you can buy some basic modules.
Once you've started, the fun begins! Not only interconnecting modules, but also ideas of own modules.
Doepfer has some nice explanations and ideas on their site: http://www.doepfer.de/DIY/a100_diy.htm
I plan to make some more stuff in the future, the current work is still quite experimental. One of the ideas is using the Mozzi library (http://sensorium.github.io/Mozzi/) . Have fun!
I plan on making a case out of MDF wood and buy the 3u rails and install them. Should be really esasy no? I already have the wood laying around here. I could make my own power supply -- it'd be linear though is that ok?
It's not difficult indeed. These are the rails that I used:
http://www.schneidersladen.de/en/catalogsearch/result/?q=rails
(But I think for a simple case, you can print your own rails)
And this looks like a nice power supply for Eurorack (beware, Eurorack requires at least +12v, GND, and -12v)
http://www.schneidersladen.de/en/doepfer-psu3.html
And a bus board to connect the modules:
http://www.schneidersladen.de/en/doepfer-a-100-busplatine.html
For a small Eurorack system you can use the miniature power supply (which has a miniature bus board as well)
http://www.schneidersladen.de/en/doepfer-a-100mnt-psu-trafo-v-2-200ma.html
Good luck!
Do you know of any STL's / models for the rails? Couldn't find any. Or perhaps a modular eurorack case that can bolt to another to keep expapnding (with holes cut on side for passing through wires)?
I don't know of any, it was just an idea. You have to model it yourself ^^.
Here's a start on a 30HP wide sloped enclosure. I just need to get the holes right -- I know they are 3mm. I just need to get the hole spacing right.
Thank you for all these useful links. I was thinking how much I liked my printer and how I was just going to print everything I could instead of buying.. but for some reason I didn't think of the idea of printing the rails...
Now I want to design an entire 8 inch wide sloped box, with integrated rails (thick ones).. should be really strong!
How many modules would 8 inches wide hold? including power supply?
I would design & print one wider than 8" but that is the max size of my 3d printer.
Sounds good ^^. With 8 inch you can store quite a few modules. Make sure your PSU will hold! (And that will greatly depend on the modules you use)
Does the psu unit have any inputs besides power from the wall? Can I just make an external psu unit for this 3d printed 8" wide case (with integrated rails) ?
No the PSU has power from the wall and outputs +12v, -12v and GND. Optionally 5v. Good luck ^^
How do u mount ur pcb in this? Would be interesting to see how it looks "behind" with the PCB mounting holes.
I don't have pictures right now, but it is most clear on arduino.stl:
the Arduino is just placed at the back, then screwed directly on the plate / holder.
Is the Arduino design an original made by you or is it based on something else?
I tried using google to find it but I couldn't find any VCO / Clock Divider arduino module out there.
Cheers and lovely looking faceplates.
Hi. It is my own creation. It has 2 analog inputs, 1 digital input and a lot of digital outputs. Arduino doesn't have analog out, except for something like the Due. This design was my first and it has a square-wave out.
Cool, thanks for the reply.
If you ever post the schematics on your blog please comment here as well so that I might get an email notification.
Cheers and good luck, mate.
Dude! This is awesome , do you have some schematics and code for the Arduino Module, it looks pretty nice!
I want to build my own.
Hi! I'm not very good at documenting what I'm doing, but maybe you can use this link here:
http://jh-interact.blogspot.nl/2014/08/simple-diy-eurorack-modules.html
Enjoy :-)
Very cool! When I first got interested in Eurorack I looked for blanking panels but didn't find much here. I have to look at this on a computer, but if you haven't already, I'd love to have all the HP sizes of blanking plates for Modular. Thank you for sharing.
Nice to hear that you like it ^^. Actually, with OpenSCAD you can make all the sizes you want with blind_plate2.scad / plate.scad. Just fill in the WIDTH_HP.
You're right. Just added the file. Happy printing ^^
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