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MIDI for Volca Modular
Old 20th March 2020
  #1
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MIDI for Volca Modular

seeing this:

https://www.tindie.com/products/sens...r-midi-in-mod/

why does the Volca Modular need this kit if there are points on the PCB for MIDI In?

can you not just solder directly to the pads? what is the benefit of this kit?
are there any issues with other volcas, going direct from the PCB pads?
is anyone controlling volca modular with midi?
Old 20th March 2020
  #2
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pppch's Avatar
 

Old 20th March 2020
  #3
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Quote:
Originally Posted by pppch View Post
[YOUTUBE]
mm yes..? that's the same kit but why is it needed? why not just solder direct to PCB pads? isn't that what we do with the other volcas? (i haven't actually done a midi out mod yet)

there's mention of 'buffering' with this. why here and not on the others? because it's In rather than Out?

(and now i want to know more about buffering midi input signals...)
Old 20th March 2020
  #4
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hcppp's Avatar
Other Volcas have MIDI IN.

You need the optoisolator to keep the circuits separate.



Quote:
Originally Posted by whatever17 View Post
seeing this:

https://www.tindie.com/products/sens...r-midi-in-mod/

why does the Volca Modular need this kit if there are points on the PCB for MIDI In?

can you not just solder directly to the pads? what is the benefit of this kit?
are there any issues with other volcas, going direct from the PCB pads?
is anyone controlling volca modular with midi?
Old 20th March 2020
  #5
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Quote:
Originally Posted by hcppp View Post
Other Volcas have MIDI IN.

You need the optoisolator to keep the circuits separate.
yes, of course. thank you.
Old 15th April 2020
  #6
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Quote:
Originally Posted by whatever17 View Post
seeing this:

https://www.tindie.com/products/sens...r-midi-in-mod/

why does the Volca Modular need this kit if there are points on the PCB for MIDI In?

can you not just solder directly to the pads? what is the benefit of this kit?
are there any issues with other volcas, going direct from the PCB pads?
is anyone controlling volca modular with midi?
I have it directly connected to the pads, without opto, but any accidental shortage to ground when connecting, might shut down the modular and even damage it. It hasn't happened yet. Opto much safer route.

Anyway no midi out from the sequencer, has anyone experienced this?? (pressing keys works but not in play mode)
Old 15th April 2020
  #7
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Quote:
Originally Posted by starradher View Post
I have it directly connected to the pads, without opto, but any accidental shortage to ground when connecting, might shut down the modular and even damage it. It hasn't happened yet. Opto much safer route.

Anyway no midi out from the sequencer, has anyone experienced this??
think also that opto isolator is much wiser !
wonder if a public DIY build is possible?

https://forum.mutable-instruments.ne...uplers/5255/10
Old 15th April 2020
  #8
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Video showing midi clock out from the modular, but not sequencer notes.

Old 3 weeks ago
  #9
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Hi, Im the one who was selling that mod on tindie (past tense since I don't plan on restocking)

The optocoupler was indeed to isolate the volca from everything, connecting directly to your midi source works, but it creates a ground loop of some sort or assuming the volca uses a virtual ground set to 4.5V or something it creates a current between grounds. In any case, it sounds very noisy, so the isolation was useful both for safety and to avoid those noises

Quote:
Originally Posted by whatever17 View Post
think also that opto isolator is much wiser !
wonder if a public DIY build is possible?

https://forum.mutable-instruments.ne...uplers/5255/10
This project has always been open source and you can find the kicad files in the github page

https://github.com/sensai7/VolcaModularMidi/

The gerber files are also available there so you can just zip those and send it to any pcb manufacturer to have your own printed circuit, the components are very simple and easy to find so it's a really straightforward DIY project

Last edited by Sensai; 3 weeks ago at 09:33 PM.. Reason: Typo
Old 3 weeks ago
  #10
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hcppp's Avatar
I saw yet another mod for this with just ground and in series to the midi in, a 680 ohm resistor.

Better than my midi out mod I did to my Volca Kick, it is direct from everything
to the jacks. Yes, if it shorts out, and it does sometimes the Volca Kick will power down. As I am someone who has seen soldering since the mid 70s, I should know better, but it is the only "illegal" midi mod I have done due to old age and treachery......and its JUST a Volca Kick (it to the curb)
(takes tongue out of cheek)


Quote:
Originally Posted by Sensai View Post
Hi, Im the one who was selling that mod on tindie (past tense since I don't plan on restocking)

The optocoupler was indeed to isolate the volca from everything, connecting directly to your midi source works, but it creates a ground loop of some sort or assuming the volca uses a virtual ground set to 4.5V or something it creates a current between grounds. In any case, it sounds very noisy, so the isolation was useful both for safety and to avoid those noises



This project has always been open source and you can find the kicad files in the github page

https://github.com/sensai7/VolcaModularMidi/

The gerber files are also available there so you can just zip those and send it to any pcb manufacturer to have your own printed circuit, the components are very simple and easy to find so it's a really straightforward DIY project
Old 3 weeks ago
  #11
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Quote:
Originally Posted by Sensai View Post
Hi, Im the one who was selling that mod on tindie (past tense since I don't plan on restocking)

The optocoupler was indeed to isolate the volca from everything, connecting directly to your midi source works, but it creates a ground loop of some sort or assuming the volca uses a virtual ground set to 4.5V or something it creates a current between grounds. In any case, it sounds very noisy, so the isolation was useful both for safety and to avoid those noises



This project has always been open source and you can find the kicad files in the github page

https://github.com/sensai7/VolcaModularMidi/

The gerber files are also available there so you can just zip those and send it to any pcb manufacturer to have your own printed circuit, the components are very simple and easy to find so it's a really straightforward DIY project
great, thanks for your work. and would it not be possible to just do it on a little piece of vero board? i'm downloading stuff to view gerber files.

Last edited by ibtl; 1 day ago at 10:51 PM..
Old 1 day ago
  #12
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Quote:
Originally Posted by starradher View Post
Anyway no midi out from the sequencer, has anyone experienced this?? (pressing keys works but not in play mode)
Yes, I came to the same conclusion. That’s a bit of a shame really, as the sequencer is quite powerful. Does anyone known if there is a possibility to hijack the sequencer signal for midi out?

I successfully managed to use the volca modular sequencer to play my neutron via cv, but it requires careful tuning which is a bit of a hassle.

By the way, I neatly integrated 3.5mm jacks for midi in and out, check it out here:

https://youtu.be/qrBlMboJDq8

cheers!
Old 21 hours ago
  #13
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hcppp's Avatar
Is that via the KB CV out from the modular?



Quote:
Originally Posted by cluso View Post

I successfully managed to use the volca modular sequencer to play my neutron via cv, but it requires careful tuning which is a bit of a hassle.



cheers!
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