Eurorack module testing tool (DIY)


#1

I had to face two problems during the development of the modules:

  • How to power and test them during development? A bench-top supply and signal generators? Too big and overkill. My rack loaded with precious stuff? No way I would let a scope probe shorting two pins impact them!
  • What kind of setup to use for factory testing? A Doepfer mini case loaded with LFO/signal generators? Too expensive, and hard to operate.

I decided to find a DIY solution, and designed the following box.

It serves the following purposes:

  • +/-12V and +5V power supply with euro connector.
  • 4 signal generation channels dedicated to clocks (tempo, resolution, pulse width); gates (period, pulse duration); CV (several waveforms, sequences stepping through 1V/Oct octaves or scales); and audio (fixed note/frequency tone generator with various waveshapes).
  • 2 signal acquisition channels, one is audio with frequency and note interval measurement (for V/Oct calibration) and the other is digital for clock testing/calibration (frequency/tempo measurement; and pulse width).

Maybe this might be useful to those of you building DIY modules and wanting a quick test/debugging setup less cumbersome than signal generators or your modular setup?

It won’t go farther than Board+programmed MCU+Mouser BOM with very minimal assistance provided (no building instructions etc). This might be useful to hardcore DIYers only anyway!


#2

Very interesting tool Olivier, leave it to you to innovate this way.


#3

a diy diy tool - very self-referential. :wink:


#4

oh nice.


#5

Very cool I’ve been wanting something like this for ages!


#6

yep where do I sign up …
regards


#7

I think this will be helpful for me (and probably many others) make friends for my surely inevitable MI modules in my now inevitable eurorack case


#8

Oh yes! Will free up a bunch of eurorack modules currently being pressed into service as signal generators, and I’ve been looking for a better frequency measurement solution than my multimeter for a while. Want!

PS What sort of MCU does it use?


#9

Good old ATmega… It’s a very simple Shruthi-like through-hole board.


#10

Nice!


#11

Its the 3nd most usefull thing right after sufficient gravity/air/light and a Scope when developing something Eurorack/DIY


#12

Interested…


#13

Hmm, this will go into the cart when available.


#14

Will there be a FrankDanielsPlexiCase™?


#15

Available on request.


#16

cool!


#17

I think I’ll get one of these when it’s available, I used to be powering my breadboard modules using a one meter long ribbon cable plugged to my euro case, and was always worried I could fry my real modules, then I started to use a separate Euro PSU, but it’s cumbersome… This will come handy!


#18

Could this be modded to other modular synth formats, i.e. +/- 15V and MOTM?


#19

+/- 15V -> change the regulators. MOTM: this is the format of the connector, right? Or any other change?


#20

yeah i’m up for this one too¬¬!

really great idea.