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loss1234
Joined: Jul 24, 2007 Posts: 1536 Location: nyc
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bearblock
Joined: Sep 27, 2006 Posts: 90 Location: uk
Audio files: 1
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Posted: Wed Apr 02, 2008 2:51 am Post subject:
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frijitz wrote: | bearblock wrote: |
in fact the rate pot seems to be generating a CV... this isn't that far from being a full-on chaotic VCO amirite? |
Absolutely! It was designed so you could use a standard expo converter to replace the "Rate" pot. I even put extra holes on the board for mounting a piggyback expo circuit. |
I'm now starting to wish my Jerkster LFO had a rate CV input, so I figure I may as well do exactly this and get a weird new audio VCO as well. Specifically, I plan to build the expo converter from your Triangle VCO on stripboard and hook up the current output to the rate pot wiper input of the Jerkster. Is really that all there is to it? Just looking for some reassurance before I buy the parts |
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loss1234
Joined: Jul 24, 2007 Posts: 1536 Location: nyc
Audio files: 41
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Wed Apr 02, 2008 5:29 am Post subject:
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bearblock wrote: | I'm now starting to wish my Jerkster LFO had a rate CV input, so I figure I may as well do exactly this and get a weird new audio VCO as well. Specifically, I plan to build the expo converter from your Triangle VCO on stripboard and hook up the current output to the rate pot wiper input of the Jerkster. Is really that all there is to it? |
No that is not an appropriate expo converter. You need one to source current into the OTAs. There are quite a few out there. You might be happy with a simple single opamp one like Rene's:
http://www.uni-bonn.de/~uzs159/index.html
Or the fancier T. Henry designs on Scott Stites' page:
http://mypeoplepc.com/members/scottnoanh/birthofasynth/id29.html
http://mypeoplepc.com/members/scottnoanh/birthofasynth/id31.html
(Leave out the linear fm and hft components.)
Ian |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Sat Nov 15, 2008 3:10 pm Post subject:
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Looks great!
Ian |
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bugfight
Joined: Aug 02, 2007 Posts: 188 Location: Arlington, TX USA
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Posted: Sat Nov 15, 2008 6:22 pm Post subject:
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thanks for sharing that,
if it had come a few months back i would definitely have built it,
but now i gots a bridechamber pcb in the queue...
anywayz, will no doubt help some others get their chaos on and whatnot |
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fluxmonkey
Joined: Jun 24, 2005 Posts: 708 Location: cleve
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Posted: Sun Nov 16, 2008 5:00 pm Post subject:
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very cool, thanks for providing another option... keep us posted on a build?
b _________________ www.fluxmonkey.com |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Tue Apr 28, 2009 9:55 pm Post subject:
Subject description: softsynth version |
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I now have a version of this system running in ABox using the diff eqn solver. I can't figure out how to post the file, as I get an illegal extension error, but I could email it to anyone who might be interested. (See the ABox thread under Instruments and Equipment --> Soft synths.)
Ian |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Tue Apr 28, 2009 10:39 pm Post subject:
Subject description: softsynth version |
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frijitz wrote: | I can't figure out how to post the file, as I get an illegal extension error, |
zip it!? _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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Posted: Tue Apr 28, 2009 10:40 pm Post subject:
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Any illegal extension can just be zipped, as .zip is a legal extension. |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
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Posted: Tue Apr 28, 2009 10:41 pm Post subject:
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You just beat me to it Fonik! |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Wed Apr 29, 2009 1:47 am Post subject:
Subject description: softsynth version |
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Excuse me??? ... Oh, you mean the file.
Ian |
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
Audio files: 23
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Posted: Wed Apr 29, 2009 1:56 am Post subject:
Subject description: softsynth version |
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frijitz wrote: |
Excuse me??? ... Oh, you mean the file.
Ian |
Excuse me, no offense meant! i am not a native speaker. your reply made me reach for the dictionary - too late, and now i learned a new phrase... _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Wed Apr 29, 2009 2:25 am Post subject:
Subject description: softsynth version |
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fonik wrote: | Excuse me, no offense meant! |
Of course not! It was funny.
Ian |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24075 Location: The Netherlands, Enschede
Audio files: 277
G2 patch files: 320
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Wed Apr 29, 2009 1:48 pm Post subject:
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Blue Hell wrote: | Extension test ...
ok that seems to work. |
Worked here for me too. Thanks again!
Ian |
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24075 Location: The Netherlands, Enschede
Audio files: 277
G2 patch files: 320
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Posted: Wed Apr 29, 2009 2:04 pm Post subject:
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You're welcome Ian. _________________ Jan
also .. could someone please turn down the thermostat a bit.
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mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18195 Location: Durham, NC
Audio files: 211
G2 patch files: 60
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Posted: Thu Apr 30, 2009 2:40 pm Post subject:
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I just loaded your abox file. It's really interesting but it goes unstable, or should I say stable, when the knobs are turned by someone like me who has no idea how this works. _________________ --Howard
my music and other stuff |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Thu Apr 30, 2009 9:03 pm Post subject:
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mosc wrote: | I just loaded your abox file. It's really interesting but it goes unstable, or should I say stable, when the knobs are turned by someone like me who has no idea how this works. |
You should have seen me struggling with it! I've replaced the previous file with an upgraded one in my previous post. This now scales properly with frequency and the amplitudes have been reduced a bit.
There is some general discussion of the analog circuit here:
http://home.comcast.net/~ijfritz/ch_cir1.htm
If the system runs to the rails, then you can increase the damping, or decrease the drive amplitude, or reduce the strength of the nonlinearity.
If the system sits at a point or makes a small orbit, then you can do the opposite of the above, or vary the drive frequency.
In general, you might start with the original settings and look separately at the effects of drive frequency and drive amplitude. Then you can explore the effect of the damping parameter, which determines the overall amount of irregularity. That should give you some feel for the important effects of the main parameters.
Thanks for trying this out!
Ian |
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scriptstyle
Joined: Jan 22, 2008 Posts: 250 Location: nj
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Posted: Fri Dec 04, 2009 2:20 am Post subject:
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Hey unkle did you ever get around to testing the stripboard layout? I have jus preped a board for population and will be getting to it sometime soon. Also where did you get your dual gang 1m pot?
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Fri Dec 04, 2009 8:37 am Post subject:
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scriptstyle wrote: | Also where did you get your dual gang 1m pot? |
Actually you can use just about any old dual pot 10k or over. 1M was just what I had on hand.
Ian |
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macumbista
Joined: Sep 12, 2007 Posts: 398 Location: berlin
Audio files: 3
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Posted: Tue Dec 15, 2009 2:50 pm Post subject:
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Hi all... I've been digging into the Dan Slater article mentioned a few times in this thread, and also writing Ian privately about his chaos generators, but I wanted to open the communication up a bit.
The interesting point in the Slater article states that "a chaotic system requires both feedback and nonlinearity". I've been working with FM cross-modulation feedback for some time now. My current setup uses four Thomas Henry XR-VCOs (at LFO rates) cross frequency-modulated through a 4x4 bipolar matrix mixer. The outputs of these VCOs are then used as control voltage for another four XR-VCOs at audio rate.
This setup produces plenty of "chaotic" patterns, and running the modulation feedback through some sort of waveshaper or phase shifter has a strong effect on the modulation. So I'm looking for other nonlinearities which can be introduced into the modulation path to increase the amount of chaos.
I'd like to emphasize that while I am interested in chaotic patterns, I'm not interested in building a single-unit chaos oscillator. I'm more looking for analog-computer-style functions I can "insert" into the feedback paths of what I've been working on already to make it more nonlinear/chaotic. I'm not sure if what I'm doing could be called "chaos" in the mathematical sense, but creatively it's the direction I'm headed in.
My first step will be to make an x³ circuit, which David Dixon and Simon Brouwer on the SDIY list have suggested can be made from four-quadrant multiplier followed by a two quadrant (OTA) multiplier. (or another four quadrant I suppose...) I've also been thinking about the Buchla 257 Dual Control Voltage Processor and the way (I understand) you could "interpolate" between two voltages (help me out here anyone!), which seems very useful as a way to voltage control the amount or type of nonlinearity something like the x³ circuit would introduce into my feedback system.
But I would love to hear any suggestions people might have for other useful or sonically interesting functions. (Also, is the EZ Chaos module the kind of thing that would be useful in my situation, or is it an oscillator by itself?)
Ian has mentioned a few times that he's interested in how people will use these projects, so perhaps my approach is that I have a use and I'm looking for the right kind of nonlinear functions to incorporate into it.
I hope this doesn't sound too vague... one of the frustrating parts of looking into all these documents is the lack of "use scenarios", so it's hard for me to get an idea of what some of Ian's circuits might be used for. Am I reinventing Ian's wheel here, or going down a different path?
Thx+best!
Derek _________________ Esoteric drones and nonlinear distortion
Custom/handmade experimental instruments
macumbista.net |
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frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
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Posted: Tue Dec 15, 2009 8:05 pm Post subject:
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The point of making dedicated chaos modules was to avoid having to set up complicated patches. The systems available each exhibits all the main types of chaotic behavior.
For additional elements in your system you could use the nonlinear x - x^3 circuit on my website. This generates a reasonable approximation using the soft knee of a zener diode as a very simple alternative to actually building complicated and cumbersome polynomial generators.
The doublewell chaos generator is a driven system, so it could be used either as a feedback element or in place of one or more of the LFOs.
Ian |
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