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 Forum index » DIY Hardware and Software
Build Pictures 2025
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analogmonster



Joined: May 30, 2011
Posts: 89
Location: Germany

PostPosted: Tue Jul 01, 2025 10:07 pm    Post subject: 8 CV to MIDI converters
Subject description: Control MIDI equipment with analog sequencers
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Hello everyone,

I was asked to build this for integrating an analog ratcheting sequencer into a studio’s MIDI equipment setup by a friend, the author of the Formant MSS2000 book.

So I decided to build this as a set of eight independent microcontroller controlled CV/GATE/CLOCK to MIDI converters.
Each converter consists of a pair of inputs (CV and CLOCK) and a corresponding CLOCK display LED.

At the top of the module you find three switches (again with indicator LEDs, because I just love Mr. Green LEDs) to select one of eight programs the module runs with.
Currently implemented is "Program 0" which was requested by my friend, but further functions are in development.

Fun Wink

Here a video which shows the module converting an analog sequence with ratcheting into MIDI based ratcheting for my MIDI controlled Oberheim SEM clone as a feasibility test:

https://youtu.be/zcSQnTrbIEA?si=22iIfI8ag4w-dPT-


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kkissinger
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Joined: Mar 28, 2006
Posts: 1430
Location: Kansas City, Mo USA
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PostPosted: Wed Jul 02, 2025 5:00 am    Post subject: Re: 8 CV to MIDI converters
Subject description: Control MIDI equipment with analog sequencers
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analogmonster wrote:
Hello everyone,
So I decided to build this as a set of eight independent microcontroller controlled CV/GATE/CLOCK to MIDI converters.
Each converter consists of a pair of inputs (CV and CLOCK) and a corresponding CLOCK display LED.



Wow, that is a beautiful build and very useful module, indeed! Thanks for the video.

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The Peasant



Joined: Nov 13, 2009
Posts: 112
Location: Sunny Alberta
Audio files: 1

PostPosted: Wed Jul 02, 2025 9:05 am    Post subject: Re: 8 CV to MIDI converters
Subject description: Control MIDI equipment with analog sequencers
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analogmonster wrote:
So I decided to build this as a set of eight independent microcontroller controlled CV/GATE/CLOCK to MIDI converters.
Each converter consists of a pair of inputs (CV and CLOCK) and a corresponding CLOCK display LED.


Very nice, please keep us updated of your progress. Do you plan on making this available to others?

Take care,
Doug

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analogmonster



Joined: May 30, 2011
Posts: 89
Location: Germany

PostPosted: Wed Jul 02, 2025 10:58 am    Post subject: Re: 8 CV to MIDI converters
Subject description: Control MIDI equipment with analog sequencers
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The Peasant wrote:

Very nice, please keep us updated of your progress.

Yes, I do. I've already started with the implementation of the next function, which will make the module being able to act as stand-alone MIDI sequencer additionally. When finished it can be selected by the top row switches.
The Peasant wrote:

Do you plan on making this available to others?

Yes, I provide circuit diagrams, gerber files and the software for free and programmed microcontrollers and / or pcbs for cost rate to everyone who is interested. Just send me an email ( carsten[at]analog-monster[dot]de, mail address can be found on my web site as well )

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analogmonster



Joined: May 30, 2011
Posts: 89
Location: Germany

PostPosted: Thu Jul 03, 2025 7:02 am    Post subject: 8 CV to MIDI converters
Subject description: The next level!
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Hello everyone,

my new converter toy reached the next level. "Program 1" is implemented. This makes the device being a stand-alone MIDI sequencer.

CLK1 serves as master clock. CV1 to CV8 are iterated. Unconnected CVs are interpreted as 0V / C0 note.

Here the new fun video: https://www.youtube.com/watch?v=OrOuQNHJ9Yw


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analogmonster



Joined: May 30, 2011
Posts: 89
Location: Germany

PostPosted: Fri Jul 04, 2025 9:28 am    Post subject: 8 CV to MIDI converters
Subject description: 2 more sequencer modes
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Fresh from the playground: 2 more sequencer modes as "Program 2" and "Program 3" implemented: "Moving Backwards" and "Knight Rider Mode" Mr. Green

See YouTube Demo 3!


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The Peasant



Joined: Nov 13, 2009
Posts: 112
Location: Sunny Alberta
Audio files: 1

PostPosted: Thu Jul 10, 2025 8:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi again everyone,

I finally was able to make a recording of the tube synth modules, including the new VCF design which is still only on breadboard. Once I get that module built I will work on making an actual video of everything so far.

To make the recording I just set up a sequence and let it play while I changed settings. I also added some reverb, since everything sounds better with reverb!

The first part is just the VCO module through the VCA, then the noise module is added for a while, then the VCF is included for the last part. Enjoy!

Take care,
Doug


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analogmonster



Joined: May 30, 2011
Posts: 89
Location: Germany

PostPosted: Fri Jul 11, 2025 5:47 am    Post subject: Formant++;
Subject description: UCVM - repair of a veteran
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My first microcontroller based module, an 8 channel MIDI2CV/GATE - interface (UCVM) from 2004 did not boot any more. Reason was a dead ISP connector.

So I did what I was afraid of, I opened it after several years and entered the guts.

Enjoy the pictures.


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PHOBoS



Joined: Jan 14, 2010
Posts: 5825
Location: Moon Base
Audio files: 709

PostPosted: Fri Jul 11, 2025 12:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

some lovely looking stuff in here. Very Happy
I might not be building anything myself at the moment but I am watching from the sidelines.

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