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Author Topic: Generate Control Voltage for a modular synth  (Read 10694 times)
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I'd be really interested in both your circuit and code, I just jumped in on this with the hopes of somehow tying MAX/MSP into my Buchla.
Thanks!
Don
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well, its been almost 12 months since I started this beast...

Anywho, I got bored about a month ago and did some new coding and managed to put together a crude voltage "sampler" for the modular using the arduino. I have wanted one of the modcan "CV Recorder" modules for a while, but couldn't justify the cost.

I found some Arduino code for recording pot movements and just adapted it for a CV input. I hooked up a CV joystick I have and recorded myself sweeping it around into the arduino. I also ran a VCO into the arduino while I tweaked the freq knobs. I then had a toggle that I would flip and it loops through the recorded data. However, using the analog input pin to sample causes some serious stair-stepping action. (only have 256 values) I also need to understand the amount of data that I can store in the arduino ram in regards to my array. I was storing  a max of 200 values and depending on how much of a delay I use, obviously that degrades the quality as well.

If there is interest, maybe I will re-breadboard this and put the code someplace in the next few weeks.
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Just finished blogging up the details of my own Arduino CV generator that I'm using to drive my x0xb0x from max. I used the AD5668 it's 16 bit, got 8 outputs and not too expensive. Details below

http://registeringdomainnamesismorefunthandoingrealwork.com/blogs/?p=51

 ;D
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Nice work crx091081gb !

I intend to start a similar project but as a CV keyboard. My aim is to use the Midibox AOUT module : http://www.ucapps.de/mbhp_aout.html .
It seems well adapted to such need (but the MAX chip is costly).
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Hadn't seen the AOUT module before, thanks for the link. The MAX525 is 27 quid for 4 outs and out of stock at Farnell. The AD5668 is 20 for 8 outputs and they have them in so go figure. That guys site does look awesome though, his CV is bipolar and goes to +/- 12 V awesome. My x0x only needs 0-5V and I can just op amp up the other outs that I use to drive my wavefolder if I fancy.

http://www.oakleysound.com/wavefold.htm

Let us know how you get on  smiley-wink
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hey guys,
Is it possible to controll dac using 595 shift registers, i could use only 3 pins, or 595's are to slow to generate tones higher than its propagation time??
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Here there is an example how to generate CV using AS3-Arduino.
http://www.reigndesign.com/blog/from-bytes-to-beats-digital-to-analog-conversion-using-as3-arduino/

Also an open source sequencer that works with Arduino + SoundLab Mini Synth.

http://code.google.com/p/cvairsequencer/
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