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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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 Posted: Sun Jul 01, 2007 1:15 pm Post subject:
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| para wrote: | i think i must have had something else wrong if the 4.7 should have worked. i'll need to go over it some more. doing stripboards in a rush is a bad idea but i was excited to get it running and short on time. i used a 074 though, there isn't anything wrong with that is there?
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Steven -- The 074 should be fine. The easiest mistakes to make are in wiring the pots, so maybe start double checking there.
Ian |
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para
Joined: Oct 16, 2006
Posts: 276
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| Posted: Sun Jul 01, 2007 1:58 pm Post subject:
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thanks Ian.
steven |
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Narbotic
Joined: Jun 24, 2007
Posts: 51
Location: Brooklyn, US
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Posted: Sun Sep 23, 2007 3:14 am Post subject:
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Question from a rookie in search of chaos:
Should I assume Op-amps are to be hooked up to +/-voltage even if it's not shown on the schematic?
Thanks, I know this question will seem silly to me in a month. 
And a big thanks to Ian, this type of circuit is the reason I became interested in DIY synth in the first place.
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- Collin Mel |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Sun Sep 23, 2007 4:54 am Post subject:
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| Narbotic wrote: | Question from a rookie in search of chaos:
Should I assume Op-amps are to be hooked up to +/-voltage even if it's not shown on the schematic? |
Yes you should. Many of us use somewhat abbreviated schematics, so don't hesitate to ask whenever something like that is unclear to you.
Ian |
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caress
Joined: Oct 08, 2007
Posts: 41
Location: brooklyn, ny
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| Posted: Mon Oct 08, 2007 8:33 pm Post subject:
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i've been checking out the jerkster and i'm wondering if anyone has any help on the subcircuit connections...? are the unused points simply not connected? (the first subcircuit +in and the 2nd/4th -in)
also, the diodes can be 1n4148's or 1n914's?
anyone have any boards for some of ian fritz's circuits? most desired would be the jerkster or dwell... |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Mon Oct 08, 2007 9:21 pm Post subject:
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| caress wrote: | | i've been checking out the jerkster and i'm wondering if anyone has any help on the subcircuit connections...? are the unused points simply not connected? (the first subcircuit +in and the 2nd/4th -in) |
Correct, no connection.
| Quote: | | also, the diodes can be 1n4148's or 1n914's? |
Yes, any general purpose Si switching diode. | Quote: | | anyone have any boards for some of ian fritz's circuits? most desired would be the jerkster or dwell... |
Sorry, but the boards are sold out.
I will send you the docs for both circuits -- hopefully the connections will be clear there.
Thanks for your interest!
Ian |
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caress
Joined: Oct 08, 2007
Posts: 41
Location: brooklyn, ny
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| Posted: Mon Oct 08, 2007 9:23 pm Post subject:
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| thanks! i can't wait to build these! |
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prophei
Joined: Jan 27, 2007
Posts: 234
Location: san francisco, ca
Audio files: 4
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| Posted: Mon Oct 08, 2007 9:47 pm Post subject:
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any other new boards coming soon fritz? that threshold gate trigger sample hold thing i bought from you is really nice!
lots of fun and very different than my usual s&h's |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Tue Oct 09, 2007 3:59 am Post subject:
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| prophei wrote: | | any other new boards coming soon fritz? that threshold gate trigger sample hold thing i bought from you is really nice! |
Thanks for letting me know  I developed that specifically for use with my chaos circuits, but it is useful in other kinds of patches also.
I don't have any specific plans for doing more boards right now. It takes a lot of time to manage all the orders and to ship the boards out, and so far it doesn't seem like very many folks have done anything with the ones they bought. I'll revisit this sometime next spring.
I have a circuit that can be switched to be either a chaos generator (the hacked EZChaos circuit) or a quadrature oscillator. That could possibly be of interest. It also has a pair of bargraph displays, so you can see what's happening without a scope.
Another waveshaper might also be fun to make a board for. Maybe the SNICster or the Wavolver. I'll be thinking about this. Right now I'm pretty busy puttting a backlog of completed circuits behind panels.
Thanks for your interest
Ian |
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mono-poly
Joined: Jul 07, 2004
Posts: 937
Location: Rotterdam, Netherlands
Audio files: 2
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| Posted: Tue Oct 09, 2007 5:31 am Post subject:
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Ian we just wanna be sure that our backlog stays big enough 
Thaks for sharing allt his stuff! |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Tue Oct 09, 2007 7:18 am Post subject:
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| mono-poly wrote: | | Ian we just wanna be sure that our backlog stays big enough |
Understood. I just hope the boards are still solderable by the time you get around to building on them. ROHS, you know.  |
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Narbotic
Joined: Jun 24, 2007
Posts: 51
Location: Brooklyn, US
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| Posted: Thu Oct 11, 2007 2:54 pm Post subject:
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| frijitz wrote: |
I have a circuit that can be switched to be either a chaos generator (the hacked EZChaos circuit) or a quadrature oscillator. That could possibly be of interest. It also has a pair of bargraph displays, so you can see what's happening without a scope. |
This sounds ideal for the art/synth unit I'm developing. Your work never fail s to intrigue.
I've etched and soldered a version of the EZ-Chaos, just have to rig the pots and enclosure tonight. I'll post pics upon completion.
I'm sure the boards you sent out will be brought to life soon. So many are worried that they'll miss the oppurtunity to purchase them that they buy long before they can build.
- Collin/Narbotic
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iep
Joined: Oct 18, 2007
Posts: 6
Location: amsterdam, the netherlands
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| Posted: Thu Oct 18, 2007 9:22 am Post subject:
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| I also misssed the boat when the chaos PCB's were for sale, oh well. I'm doing them on perfboard now and I'm making progress slowly but surely. Excellent circuits! |
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Narbotic
Joined: Jun 24, 2007
Posts: 51
Location: Brooklyn, US
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| Posted: Thu Oct 18, 2007 3:53 pm Post subject:
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"Slow" progress here as well. My EZ-Chaos seems dead in the water but I have to admit the board I etched turned out a little to chaotic in appearance. I think I'll move straight to the Jerkster as it seems to be more of what I want anyhow.
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loss1234
Joined: Jul 24, 2007
Posts: 1536
Location: nyc
Audio files: 41
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bearblock
Joined: Sep 27, 2006
Posts: 90
Location: uk
Audio 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 Dec 08, 2007 12:25 pm Post subject:
Re: jerkster trouble |
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| bearblock wrote: | finally got round to building my jerkster. unfortunately it just seems to generate DC - the level varies depending on the pot positions but it doesn't move on its own.
while assembling it there was a space on the board for one component that doesn't seem to be on the schematic... might this be related? have i missed something here? |
Hi bear --
I'm glad you got the time to build this. It looks like you did a nice neat job. We should be able to get this running without too much trouble.
I checked your photo directly against a working board and it all looks OK. Just to check one thing -- please make sure C1 isn't shorting against the trace that goes under it.
The extra resistor -- R29 -- is not needed to get the circuit working. It's for making a small offset adjustment that sometimes is necessary (see #3 on the docs). It's shown on the schematic directly above U3A, and on the stuffing diagram it is notated as optional. I suppose there is a chance that you have a previous version of the docs that doesn't mention R29. If so, just let me know. But don't worry about it for now.
All I can suggest right now without further details is to go over the pot wiring very carefully. Note that I have used (1) for the CW terminals (2) for the sliders and (3) for the CCW terminal. Your PS voltages are probably OK if you are getting a trace. But be sure to remember to double check them.
Meanwhile, I'll fire this board back up and give you some pot settings to get started. You will not get oscillations for all combinations of settings.
I'll be back with you later.
Ian |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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chaotician
Joined: Dec 03, 2007
Posts: 17
Location: folkesteone, kent, UK
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| Posted: Sun Dec 09, 2007 2:25 am Post subject:
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| Quote: | | fritz-in response to someone else, you mentioned docs that went with the boards? are these online or printed? i'd love to get the docs for the chaos circuits as i am starting them on pefboard. |
Hi Loss, here is the page for the EZ chaos that Fritz posted on his website http://home.comcast.net/~ijfritz/ch_cir1.htm.
And here is the Jerkster http://home.comcast.net/~ijfritz/ch_cir2.htm.
I hope this is helpful,
Matte |
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bearblock
Joined: Sep 27, 2006
Posts: 90
Location: uk
Audio files: 1
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| Posted: Sun Dec 09, 2007 10:23 am Post subject:
Re: jerkster trouble |
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| frijitz wrote: | | Just to check one thing -- please make sure C1 isn't shorting against the trace that goes under it. |
lol well spotted Ian; of course that's exactly what it was.
Cheers!
t |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Sun Dec 09, 2007 11:01 am Post subject:
Re: jerkster trouble |
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| bearblock wrote: | | frijitz wrote: | | Just to check one thing -- please make sure C1 isn't shorting against the trace that goes under it. |
lol well spotted Ian; of course that's exactly what it was.
Cheers!
t |
Wow, glad it was that easy. Thanks for posting such a clear photo. So it's wiggling away?
Ian |
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bearblock
Joined: Sep 27, 2006
Posts: 90
Location: uk
Audio files: 1
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| Posted: Tue Dec 11, 2007 2:52 pm Post subject:
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yes, yes it is.
one thing i wasn't expecting is the range of the frequency control. my lorenz attractor doesn't even have one so it's just an LFO. but it is fun to crank the jerkster up to audio rate and listen to the transitions between chaos and periodicity as you change the other constants.
in fact the rate pot seems to be generating a CV... this isn't that far from being a full-on chaotic VCO amirite? though musically i think it will see most use (by me) as a modulator. it definitely does something to a drone/texture you can't do with regular LFOs or random generators.
now i'm gonna put a triple red/green/blue LED in there to track the outputs  |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Tue Dec 11, 2007 4:23 pm Post subject:
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| bearblock wrote: | one thing i wasn't expecting is the range of the frequency control. my lorenz attractor doesn't even have one so it's just an LFO. but it is fun to crank the jerkster up to audio rate and listen to the transitions between chaos and periodicity as you change the other constants.
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.
| Quote: | | though musically i think it will see most use (by me) as a modulator. it definitely does something to a drone/texture you can't do with regular LFOs or random generators. |
Thanks for the report. This kind of info is very important to me as far as knowing how to proceed with further development.
| Quote: | | now i'm gonna put a triple red/green/blue LED in there to track the outputs |
Great idea. One chaos box I built has a pair of LED bargraph displays, which prove to be quite useful, at least to me.
Ian
EDIT: To clarify, the bargraph display mentioned above is external to the chaos circuit, and is taken directly from the National Semiconductor Data Sheet. Its purpose is to give a visible indication of the circuit output, to make it easier to use without an oscilloscope. I'm sorry if this caused any confusion. |
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iep
Joined: Oct 18, 2007
Posts: 6
Location: amsterdam, the netherlands
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| Posted: Wed Dec 12, 2007 1:25 pm Post subject:
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I got a Driven Double-Well Potential circuit up and running here, fascinating patterns! I'm enthousiastic about these implementations of chaotic models, they are simple & elegant and with lots of musical potential.
I am in the progress of building a voltage-to-OSC converter to use some of these circuits and some motion-sensors within Supercollider, using this device http://koncon.nl/ipsonlab/ |
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frijitz
Joined: May 04, 2007
Posts: 1734
Location: NM USA
Audio files: 54
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| Posted: Wed Dec 12, 2007 2:20 pm Post subject:
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| iep wrote: | I got a Driven Double-Well Potential circuit up and running here, fascinating patterns! I'm enthousiastic about these implementations of chaotic models, they are simple & elegant and with lots of musical potential.
I am in the progress of building a voltage-to-OSC converter to use some of these circuits and some motion-sensors within Supercollider, using this device http://koncon.nl/ipsonlab/ |
Wow! That's all I can say because I don't understand a bit of it. 
So the signal is treated just like a sensor signal?
I'd really appreciate being kept up to date on this, especially on any audio that eventually comes out the other end.
Ian |
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