Introductions: Say hello, tell us about yourself and your projects

What about the Royale with cheese?

1 Like

:slight_smile: Does not even need translating back…

Hello, this is Hagiwo.
I never knew there was such a great community.
This is a very cozy place for me.

I am an engineer from Japan.
Unfortunately, I was assigned the job of software auditing, even though I had no coding experience. It’s also unfortunate for the business partner.
I needed to study programming and started making my own digitally controlled modular synths.
I bought an arduino introductory book from amazon in October 2020 and am studying control little by little every day.

My youtube channel introduces some works.

The design concept is
Must be digitally controlled.
It is cheap and has a small number of parts.
It works only at 12V. (Works with the existing eurorack standard)
It works only at 5V. (I want to make a system that runs on a mobile battery)
Do not use -12V. (Negative voltage makes the circuit difficult to understand and, in the worst case, destroys other expensive modules.)
Must be 6 HP. (I think limits are the source of creativity)
That I can learn new things.

My project, which comes from that concept, may seem like a detour to you.


Welcome! Be sure to keep us posted on updates and feel free to share photos! :slight_smile:


Welcome Hagiwo.

Some of your “strange” choices makes much more sense now that we know your motivations.
Your Generative Seq is definitely on my list, and probably the Clock Mult/Div as it is the simplest I saw until now…
(I can’t play any instrument :slight_smile: )


Welcome, you may want to take a look at the Teensy + Audio thread,


Hello @HAGIWO , happy to see you here :slightly_smiling_face:
welcome to the forum !


Welcome @HAGIWO! Thanks for sharing your work. :slight_smile:



In my mind it’s the opposite… the contortions needed to provide a virtual ground and shift incoming AC signals make single supply designs more complicated, not less.

And in modulating pitch, ±5 V control voltages are useful, but you need a negative rail (or some fancy conversion) to provide them.

However, if you want to operate off a battery, no further justification of no -12 V is needed!

Only badly designed ones!


@HAGIWO Do you know AE Modular from Tangible Waves ?
That looks a much better format than Eurorack for your concept.

  • Runs on 5V only. Either a wallwart or a guitar pedal battery (take care of polarity !)
  • Small, portable.
  • The cheapest patch cord you can image (Dupont cables…)
  • Standard width is 50mm (that’s 10HP…), but height is 100mm (Eurorack is 128.5mm), not much bigger than yours, and somewhat more limited in depth if you want to use the official cases.


Forum for DIY:

Technical information:


I’ve been playing around with my Keystep Pro, which arrived yesterday. Here is my first track ever (just the first part of Nightcall from Kavinsky, but without the vocals). Next I will try to make the vocals using a demo version of Arturia’s Vocoder-V software.

Arpeggio: XVA1
Bass: Hydrasynth
Sub-Bass: Kosmo
Drums: PO-32


also unfortunate for the business partner.

Hahahaha! :joy:

Welcome! I love your channel, have been a fan since the beginning!


Dope. Nightcall! Sounds so close at first i thought you were just playing on top of the track. :slight_smile:


Hey lovely people,

Turning knobs, pushing buttons and fiddling with sliders is something I really like to do - even when it’s seemingly only me who enjoys the wall of noise that produces. I just recently really got into modular synths, but it’s a wonderful way to waste time. And money. :slight_smile:
At some point in the future I’d like to design and solder my own modules, nothing fancy, but for now I am sticking to DIY kits and ready-made stuff.

With that said, I am rather uneducated when it comes to electronics; it’s going to be quite the learning curve, but it’s also quite rewarding!

Looking forward to chat with like-minded people. :smiley:


It’s not a waste of money :wink:

My electronic design skills are ancient, but if you take some of Sams schematics and break them down you will find many common elements… tie them up with datasheets and a raft of projects on the internet and you find an endless source of module ideas…

Most of us produce noise ( many complaints :wink: ) … but everynow and then a noise becomes a useful sound… Its at that point you need your camera…



Thanks! Nah, I agree - it gives me joy and something to do while sitting around at home. Thanks for the tips - first step will be to produce a module that does something without blowing up. (had one DIY module blow up due to printing errors on the PCB. Which reminds me - one should always read the manufacturers BOM and building notes before assembly :wink: )

Yeah, and I promise that I’ll whip out a camera and upload a video as soon as I produce something new and cool - maybe don’t hold your breath, though :smiley:



Welcome in the forum, i think you are in the good place to find a lot of module schematic or stripboard :slight_smile:


Always! Mistakes happen, and mistakes on the PCB are hard to correct! And I am no fan of exploding caps and burning chips.



Hey welcome. I’ve really enjoyed the forum and the people on it. I wanted to share my latest version of my “Kosmo mini” if I can say that. I had the panels which are 6.5" x 3" and used small jacks. But everything else is Kosmo style. The board hanging out in the empty slot is a midmuso c12 and the digit thing on the right is the 99 dsp effects thing stuck into a panel with dry and left and right wet outs.


Kosmo jr. looking good !