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Fernando
Joined: Dec 30, 2006
Posts: 286
Location: Barcelona & Emporda, Spain
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fluxmonkey
Joined: Jun 24, 2005
Posts: 708
Location: cleve
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 Posted: Fri Feb 09, 2007 10:45 am Post subject:
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i've tried building that, twice, but it never gave me any love... still sitting in the pile of projects-to-tinker-with-someday-in-hopes-they'll-come-to-life...
b |
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Fernando
Joined: Dec 30, 2006
Posts: 286
Location: Barcelona & Emporda, Spain
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| Posted: Fri Feb 09, 2007 2:12 pm Post subject:
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=:s
The linked article shows a circuit to inspect transistors and see if it's of the required type.
It seems the 2N2222 works for shure... what did you use? |
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CJ Miller
Joined: Jan 07, 2007
Posts: 368
Location: 127.0.0.1
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| Posted: Sat Feb 17, 2007 2:38 am Post subject:
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Parts of the circuit go backwards in time!? Yikes... I'm surprised that I've not heard of Negistors until now. When I can find those 2N2222s that a kind souls sent to me in a synth doggiebag I'll build one of these. Also, my Negistor searching yielded some neat stuff on this site - much of it is in German but I can make out some - more interesting circuits!
http://homepages.internet.lu/absolute3/tronic/defaulte.htm |
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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: Sat Feb 17, 2007 4:33 am Post subject:
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Just paste that URL into the webpage translator at babelfish. Not perfect, but very useful.
http://babelfish.altavista.com/
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What makes a space ours, is what we put there, and what we do there. |
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Fernando
Joined: Dec 30, 2006
Posts: 286
Location: Barcelona & Emporda, Spain
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| Posted: Sat Feb 17, 2007 7:36 am Post subject:
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On the linked article (see above) there is a very simple circuit to test any transistor and see if it is a negistor.
I do not completely understand how to use that test circuit though =:s
So if you use it, tell us. Many transistors could be negistors
| CJ Miller wrote: | Parts of the circuit go backwards in time!? Yikes... I'm surprised that I've not heard of Negistors until now. When I can find those 2N2222s that a kind souls sent to me in a synth doggiebag I'll build one of these. Also, my Negistor searching yielded some neat stuff on this site - much of it is in German but I can make out some - more interesting circuits!
http://homepages.internet.lu/absolute3/tronic/defaulte.htm |
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robthefiddler
Joined: Nov 10, 2006
Posts: 17
Location: Dallas, Tx
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| Posted: Tue Feb 20, 2007 1:19 am Post subject:
2n2222 |
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I have tried several other transistors...but only the 2n2222s seem to work.
Luckily, they are still bountiful at Radio Shack.
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https://github.com/robstave
www.robthefiddler.net if it works maybe? |
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-minus-
Joined: Oct 26, 2008
Posts: 787
Audio files: 13
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| Posted: Mon Jan 18, 2010 5:52 am Post subject:
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3 YEARS LATER....
Probably not forum etiquette (my son tells me this is called 'necro-posting')...
BUT....
I just breadboarded this recent discovery (the Cacophonator) and I love it! About to stripboard it. I'll post the diagram here or elsewhere soon. Just wanted to know what the various pots actually are in terms of labeling a panel? Are the oscillators?
I'm finding that shorting out various caps with a bit of wire momentarily is producing some alright tonal variations... Might experiment more with this really fun noise maker! ...a GREAT discovery! Well, I like it anyway...  |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Mon Jan 18, 2010 6:23 am Post subject:
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| -minus- wrote: | 3 YEARS LATER....
Probably not forum etiquette (my son tells me this is called 'necro-posting')... |
some of the circuits we're using is about 30+ years old - how would one call this? 'necro-engineering'?
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matthias
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Tech Buddy at Random*Source |
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-minus-
Joined: Oct 26, 2008
Posts: 787
Audio files: 13
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| Posted: Mon Jan 18, 2010 9:49 am Post subject:
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HA HA! Thanks Fonik. Spent a lot of time looking at your stuff. Particularly the sequencer. You take real pride in your work! I made an Atari Punk Console with a 4017 sequencer last week. Love it!
Just made a vactrol (I think you call them), and put it in as an option to the 10K pot. Certainly takes the cocophonator to a new level. Got a simple two transistor LED flasher circuit hooked up with a pot to change the rate of flash. This is so great this DIY thing! So glad I googled 'build synth' last year and ended up here! Bit of a major addiction going on... I simply don't sleep anymore. Long live Necro-Engineering! |
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mosc
Site Admin
Joined: Jan 31, 2003
Posts: 18247
Location: Durham, NC
Audio files: 225
G2 patch files: 60
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| Posted: Mon Jan 18, 2010 11:06 am Post subject:
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| -minus- wrote: | 3 YEARS LATER....
Probably not forum etiquette (my son tells me this is called 'necro-posting')... |
Ha Ha... That's a good one. But around here we encourage reviving old posts. There are a lot of great ones that nobody has seen. Some forums do "pruning" to get rid of old topics. Not here. We keep everything until there is some technical catastrophe. 
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my music and other stuff |
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carlox
Joined: Jan 20, 2010
Posts: 3
Location: Denmark
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| Posted: Wed Jan 20, 2010 7:07 pm Post subject:
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@ -minus- :
I could really use the stripboard layout, as I am about to build it.
It would save me som time |
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mosc
Site Admin
Joined: Jan 31, 2003
Posts: 18247
Location: Durham, NC
Audio files: 225
G2 patch files: 60
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| Posted: Wed Jan 20, 2010 8:52 pm Post subject:
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Carlox,  to electro-music.com
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my music and other stuff |
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carlox
Joined: Jan 20, 2010
Posts: 3
Location: Denmark
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| Posted: Thu Jan 21, 2010 2:22 pm Post subject:
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Thanks
I've been using this forum for at while as a ressource to nice audio-curcuits.
I do stuff like Atari Punk Console, Thing Modulator, Drawdio, 4017 sequencer and Ardiuno Punk Console.
Mostly on breadboard and stripboard.
Looking forward to do more modular-like yet simple curcuits. |
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-minus-
Joined: Oct 26, 2008
Posts: 787
Audio files: 13
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| Posted: Fri Jan 22, 2010 2:30 am Post subject:
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Hey carlox.
I am away from home for a week. As soon as I return, I shall stripboard this up and post the diagram here. Sorry about the delay. If you can wait a bit, I shall get this done as soon as I can. |
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rpocc
Joined: Jan 23, 2010
Posts: 17
Location: Russia
Audio files: 1
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| Posted: Sat Jan 23, 2010 2:40 pm Post subject:
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Hello everybody, i'm new on this forum though i read sdiy section periodically since i've become interested in synth diy and modding.
Actually i do not like most of these bleeping noise "weird sound" generators, but this one sounds good and it is extremely simple and may be a nice piece for modular system.
But i'm afraid that this circuit is dedicated for use only with battery.
Can anyone make a suggestions about powering it from A-100-style power bus? (actually i use modified PC PSU)
I have a suspection that this may cause either unwanted capacitor load on whole power rail and affect the whole system or in opposite case the last two oscillators will not affect remaining circuit due to stabilized voltage feed.
Maybe the standard Doepfer-style solution like 0.1u in parallel with 100n caps from V+ to GND will help to isolate this circuit from others? |
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carlox
Joined: Jan 20, 2010
Posts: 3
Location: Denmark
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| Posted: Sat Jan 23, 2010 5:48 pm Post subject:
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I'm well into the process of building a strip board version now.
I've modified the pcb layout to fit a strip board and included the extra capacitors and switches from the Cacophonator II kit from
http://www.sascha-neudeck.com/SubtleNoiseMaker/Cacophonator-Kit.html
The parts are placed, but nothing is soldered yet
... still needing the cd40106. Wonder what happens if use use inverters instead og inverted schmitt triggers, probably not gonna work? |
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rpocc
Joined: Jan 23, 2010
Posts: 17
Location: Russia
Audio files: 1
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| Posted: Sun Jan 24, 2010 12:50 am Post subject:
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| carlox wrote: | | Wonder what happens if use use inverters instead og inverted schmitt triggers, probably not gonna work? |
Probably no, but you can recreate the schmitt trigger inverter with three inverters like this:
| Code: |
Rx2
+---\/\/\/--+
R | |
IN---\/\/\/-+-|>o---|>o-+-|>0-+-OUT
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In this case you need three 4069, 4049, 7404 etc.
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-minus-
Joined: Oct 26, 2008
Posts: 787
Audio files: 13
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| Posted: Sun Jan 24, 2010 6:26 am Post subject:
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| carlox wrote: | I'm well into the process of building a strip board version now.
I've modified the pcb layout to fit a strip board and included the extra capacitors and switches from the Cacophonator II kit from
http://www.sascha-neudeck.com/SubtleNoiseMaker/Cacophonator-Kit.html
The parts are placed, but nothing is soldered yet
... still needing the cd40106. Wonder what happens if use use inverters instead og inverted schmitt triggers, probably not gonna work? |
Thanks for the link to the Cacophonator II. Keen to hear how your stripboard turns out. I'll be home next weekend... so I won't be able to play stripboarding until the following week  . I will be stripboarding this though! Really like this thing... even with the audio taper pots, the only ones I had handy. Thinking about a 'steam punk' box to put it in... |
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hexagon5un
Joined: Apr 10, 2009
Posts: 38
Location: Munich, Germany
Audio files: 1
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| Posted: Tue Jan 26, 2010 9:19 am Post subject:
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| rpocc wrote: | ...
But i'm afraid that this circuit is dedicated for use only with battery.
Can anyone make a suggestions about powering it from A-100-style power bus? (actually i use modified PC PSU)
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These type circuits will run great on the 5v off your PC power supply.
(BTW, built the cacaphonator a while ago, and it was super fun. Highly recommend. And don't feel constrained to use the same capacitor values either. Play around!) |
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mosc
Site Admin
Joined: Jan 31, 2003
Posts: 18247
Location: Durham, NC
Audio files: 225
G2 patch files: 60
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| Posted: Wed Jan 27, 2010 11:04 am Post subject:
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rpocc to electro-music.com
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my music and other stuff |
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-minus-
Joined: Oct 26, 2008
Posts: 787
Audio files: 13
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| Posted: Wed Feb 03, 2010 7:12 pm Post subject:
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This is really strange... I built the Cocophonator on a breadboard and liked the sound. I made up a stripboard and it sounds like a completely different beast. The stripboard has that huge cap discharge when the power is unhooked, which my breadboard didn't have to such a degree. Also with the breadboard when i shorted out the electrolytic caps I got really great sounds. The stripboard doesn't seem to do this. Think I liked the breadboard better. Only problem is I pulled a lot of components off the board to build the stripboard. Obviously I went wrong with one of these... or both!
A lesson to learn: Don't pull apart breadboards straight away! I'll see if I can work out what's going on. Perhaps a solder bridge or a cap in the wrong spot or something. Then I might draw up a more respectable diagram and see if anyone can spot where I might have gone wrong with the stripboard...  |
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-minus-
Joined: Oct 26, 2008
Posts: 787
Audio files: 13
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| Posted: Fri Feb 05, 2010 1:15 am Post subject:
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Just went out and got some more 40106 IC's...
Just a quick question... I'm getting very different results on my Cacophonator breadboard with these new chips. These are Phillips ones. They have HEF 40106 BP stamped on them. Also BC824 02 and what looks like UnG06406 inscribed on them too.
The previous IC I was using has CD 40106BE or CD 40106DE written on it... Not sure if it's BE or DE, hard to tell.
MY QUESTION IS THIS: Are all 40106 chips alike? Do they behave in a similar manner, perhaps to a greater level of efficiency or different mounting methods? I'm not sure if the non-Phillips brand is faulty or not, but the two do not sound the same.
These are Hex Schmitt triggers/inverters right? Can anyone help and educate me here in the process?
Much appreciated! |
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hexagon5un
Joined: Apr 10, 2009
Posts: 38
Location: Munich, Germany
Audio files: 1
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| Posted: Fri Feb 05, 2010 10:27 am Post subject:
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| -minus- wrote: | Just went out and got some more 40106 IC's...
...
These are Phillips ones. They have HEF 40106 BP stamped on them. Also BC824 02 and what looks like UnG06406 inscribed on them too.
The previous IC I was using has CD 40106BE or CD 40106DE written on it... Not sure if it's BE or DE, hard to tell.
MY QUESTION IS THIS: Are all 40106 chips alike?
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They're pretty similar, but they won't be identical.
For instance, I googled the datasheets for both chips and noticed that at 10v supply, the Phillips part switches on at 4.5v and off at 5.8v while the TI part switches on at 3.9v and off at 5.9v, so one's swinging 1.3v while the other swings 2v. That could matter, and will certainly make them run at different pitches if all the other components are the same.
Basically, with digital chips used in an analog way (as here) you're playing around on the edges of what the chip is specified for. Small differences can matter. Chip-to-chip variation within a brand may even change things a bit. You're going to have to tweak around.
Oh yeah. The "B" at the end of the part name means "buffered". Instead of just taking the output of the Schmitt inverter, they also run it through two more inverters on the way out. It just makes the signal more stable. The rest of the codes are probably manufacture date and factory and stuff like that. I don't think they matter...
And differences between a breadboarded circuit and the soldered-up version are pretty common with Lunetta circuits. I often build the soldered version with a second set of "identical" parts so I have the breadboard version to compare to as I go along. Sometimes it takes swapping a resistor here or adding a bit more capacitance there to make the two circuits behave alike.
Or it could be you just made a wiring mistake.
Enjoy! (And keep at it until you're satisfied. Then move on to the next one.) |
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-minus-
Joined: Oct 26, 2008
Posts: 787
Audio files: 13
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| Posted: Fri Feb 05, 2010 7:37 pm Post subject:
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Thanks for the help Hexagon5un!
The Phillips 40106 seems to have more pauses of silence between the 'loops' of noise. I emailed Art Harrison via the page where he outlines the design. He said pretty much what you have just said. It's a matter of preference with the IC's. There is a difference in sound. I might build a dual version with both types of chip and really irritate my neighbours!  |
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