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 Forum index » DIY Hardware and Software
Turning a modular polyphonic
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OW



Joined: Nov 03, 2009
Posts: 121
Location: London

PostPosted: Sat Feb 02, 2013 10:42 am    Post subject: Turning a modular polyphonic Reply with quote  Mark this post and the followings unread

Hi,

I want to be able to use a midi keyboard to play chords on my modular, essentially making it psuedo-polyphonic. Does anyone know of any DIY solutions to be able to do this? Basically I just need to split midi notes so one midi note corresponds to a single CV out.

Any help would be greatly appreciated!

Thanks!
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capicoso



Joined: Nov 19, 2012
Posts: 126
Location: Argentina

PostPosted: Sat Feb 02, 2013 12:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

This is polyphonic http://www.acxsynth.com/midi2cv/midi2cvfr.htm

it looks very good. I wanted to build it but i couldn't find the MCP... so i built a simpler one to start... but gonna build this someday
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OW



Joined: Nov 03, 2009
Posts: 121
Location: London

PostPosted: Sat Feb 02, 2013 1:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Brillant, this looks good! I managed to find the MCP on the microchip.com site, however there is a minimum order of 5.
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capicoso



Joined: Nov 19, 2012
Posts: 126
Location: Argentina

PostPosted: Sat Feb 02, 2013 2:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

OW wrote:
Brillant, this looks good! I managed to find the MCP on the microchip.com site, however there is a minimum order of 5.

Good to know. I'll have to make a group buy then. Razz
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analog_backlash



Joined: Sep 04, 2012
Posts: 387
Location: Aldershot, UK
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PostPosted: Sat Feb 02, 2013 5:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

Farnell also sell the MCP chip individually. UK link:

http://uk.farnell.com/microchip/mcp4822-e-p/12bit-dac-spi-vref-dual-pdip8/dp/1439413

I don't know how this compares with the straight from Microchip price. I knew about this, because I've been thinking about building the circuit myself.

Gary
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diablojoy



Joined: Sep 07, 2008
Posts: 795
Location: melbourne australia
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PostPosted: Sat Feb 02, 2013 7:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

hexinvertor is doing a project for the acxsynth midi2cv module over on muffwigglers.
he intends to provide complete kits i believe.

edit: link.http://www.muffwiggler.com/forum/topic-75544-0.html&postdays=0&postorder=asc&highlight=

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TheAncientOne



Joined: Dec 26, 2006
Posts: 146
Location: United Kingdom

PostPosted: Wed Feb 06, 2013 7:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

There is also Paul Maddox's 'PolyDAC'. It is a mature design, that was once a commercial product.

Original design here:
http://www.vacoloco.net/synths/polydac/

(note the link to Elby Designs on Paul's site is out of date)

PCBs and kits here:
http://www.elby-designs.com/contents/en-us/p92.html

The boards are good quality, an most of the info is on site.

I've built the board but not finished the panel yet. Build wasn't hard.

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isak



Joined: Dec 13, 2009
Posts: 689
Location: Israel
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PostPosted: Thu Feb 07, 2013 7:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
This is polyphonic http://www.acxsynth.com/midi2cv/midi2cvfr.htm

it looks very good. I wanted to build it but i couldn't find the MCP... so i built a simpler one to start... but gonna build this someday

Happy to see that someone built the simpler version.
May I ask If it's good? I see there is no trimmers, it's the first midi2cv with no trimmers.
This is why I ask.

BTW about the MCP chips...
I ordered samples from the company it self including the pic 16F88 chips.
4 x MCP and 2 x 16F88, cost me only 7.5$ for all chips Smile
They arrived very quick.

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capicoso



Joined: Nov 19, 2012
Posts: 126
Location: Argentina

PostPosted: Thu Feb 07, 2013 10:07 am    Post subject: Reply with quote  Mark this post and the followings unread

isak wrote:
Quote:
This is polyphonic http://www.acxsynth.com/midi2cv/midi2cvfr.htm

it looks very good. I wanted to build it but i couldn't find the MCP... so i built a simpler one to start... but gonna build this someday

Happy to see that someone built the simpler version.
May I ask If it's good? I see there is no trimmers, it's the first midi2cv with no trimmers.
This is why I ask.

BTW about the MCP chips...
I ordered samples from the company it self including the pic 16F88 chips.
4 x MCP and 2 x 16F88, cost me only 7.5$ for all chips Smile
They arrived very quick.

Hello. When i said simpler version, i didn't mean the lite, i meant the midi 628 from marc. It uses 16f628 and dacs 0830/1/2. And i'm still on it, troubleshoting the last part in the DACs/OPAs section.
That's nice, i thought about ordering the MCPs but i didn't think of ordering the 16f88, they're expensive here, so i'll order them like you did.
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Boogdish



Joined: Sep 21, 2009
Posts: 122
Location: Bloomington, IN

PostPosted: Thu Feb 07, 2013 10:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Sorry to contribute to the off topic, but the light ACX midi to CV was one of my first digital projects I built. I think it's great. You don't need a trimmer as long as your +5V reference is stable for the DAC, which is pre-trimmed internally. The only problem is that it doesn't have a full 5v range, so my keyboard just sort of stops producing new notes at the end.

I'm very happy with mine, you can build one on protoboard easily. And if you don't have a pic burner, buying a cheap one online is still much cheaper than getting a commercial midi to cv.
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capicoso



Joined: Nov 19, 2012
Posts: 126
Location: Argentina

PostPosted: Thu Feb 07, 2013 10:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Boogdish wrote:
Sorry to contribute to the off topic, but the light ACX midi to CV was one of my first digital projects I built. I think it's great. You don't need a trimmer as long as your +5V reference is stable for the DAC, which is pre-trimmed internally. The only problem is that it doesn't have a full 5v range, so my keyboard just sort of stops producing new notes at the end.

I'm very happy with mine, you can build one on protoboard easily. And if you don't have a pic burner, buying a cheap one online is still much cheaper than getting a commercial midi to cv.

So how many octaves do you reach? 4 and a half or something?
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isak



Joined: Dec 13, 2009
Posts: 689
Location: Israel
Audio files: 18

PostPosted: Thu Feb 07, 2013 11:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you for replying.

I actually bought a burner but I really don't know how to use it Embarassed
Can you please guide me?
This is what I've bought...
http://www.ebay.com/itm/251122310653?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

I thank you in advance.

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capicoso



Joined: Nov 19, 2012
Posts: 126
Location: Argentina

PostPosted: Thu Feb 07, 2013 1:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

isak wrote:
Thank you for replying.

I actually bought a burner but I really don't know how to use it Embarassed
Can you please guide me?
This is what I've bought...
http://www.ebay.com/itm/251122310653?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

I thank you in advance.

I pm you
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