Joined: Nov 10, 2011 Posts: 789 Location: Lancashire, England
Audio files: 14
Posted: Fri Jun 01, 2012 10:06 am Post subject:
Saware-angle wave circuit Subject description: makes a weird wave from your triangle wave
This circuit makes an unusual waveform which is a combination of saw, triangle and square, hence the name saware-angle
It's function is very simple; when the triangle wave input goes above the CV input, the comparator output goes high and the transistor is turned on. Then the output of the circuit is effectively connected to ground, cutting off the signal. However, only a portion in the middle of the wave is cut off, leaving the saware-angle wave at the output.
The square portion can have it's pulse width modulated by changing the CV input, but as it says on the diagram, the CV changes the amplitude of the output wave. This can be remedied by changing the amplitude of the triangle wave instead
I've been reluctant to share this idea but I don't care what other people think, if you don't like it, I don't care. I think it's a very interesting wave and I've wanted a waveform like this for ages.
saware-angle wave machine.png
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_________________ As a mad scientist I am ruled by the dictum of science: "I can't really be certain but I think I might have an idea"
very cool! i might have to build this as an LFO.
Any way to remove the low pulse part so it's a continuous l\/ll\/l? _________________ http://www.youtube.com/user/borisandfef
Joined: Nov 10, 2011 Posts: 789 Location: Lancashire, England
Audio files: 14
Posted: Sun Jun 03, 2012 5:39 am Post subject:
I didn't know if this wave had a name, I think saware-angle is cooler than M wave though
inlifeindeath wrote:
very cool! i might have to build this as an LFO.
Any way to remove the low pulse part so it's a continuous l\/ll\/l?
The low pulse is what gives it the M shape, otherwise it's just a triangle. That is the whole function of this circuit, to add that low pulse to a triangle wave to get an M or saware wave.
Observe, comrades, for I have videolyzed it:
Now with the addition of some control voltage modulation;
_________________ As a mad scientist I am ruled by the dictum of science: "I can't really be certain but I think I might have an idea"
Sorry JingleJoe, but I was only joking about it being technically called an "M wave". Maybe it is, I don't know, but at least that's what comes to mind when I see it. Of course, more accurately, it's the "M underscore wave" _M_M_M_ hahaha.
I remember producing it before, but not how.
Anyway, cool sounds... carry on!
Joined: Nov 10, 2011 Posts: 789 Location: Lancashire, England
Audio files: 14
Posted: Sun Jun 03, 2012 6:36 am Post subject:
RingMad wrote:
"M underscore wave" _M_M_M_ hahaha.
Hahahaha!
Quote:
Anyway, cool sounds... carry on!
James.
Thanks, I really want to make a VCA to control the triangle input so I can get nicer pwm effects. I tried a simple VC Attenuator, which was easier to conceive than a VC Amplifier, but it didn't work very well.
I am thinking that one could probably put a PNP transistor in the feedback of the standard, simple, op amp inverting amplifier to make an attenuator, without adding any current to the inputs of the op amp from the transistor base because of the way the PNP transistor works. Anyways, ideas to try another day.
EDIT: I just thought; divided feedback! That makes the transistor easier to use as a voltage controlled resistor. When that turns out to be really dodgy I may just resort to an LM13700 _________________ As a mad scientist I am ruled by the dictum of science: "I can't really be certain but I think I might have an idea"
Joined: May 04, 2007 Posts: 1687 Location: NM USA
Audio files: 54
Posted: Sun Jun 03, 2012 10:16 am Post subject:
Looks good -- can't imagine why anyone would't like it! I use a similar slicer/dicer in my Wavolver waveshaper. In this one the chopped out segments can be replaced by a variable amplitude folded wave.
http://home.comcast.net/~ijfritz/sy_cir6.htm
An improved version is available from Elby.
Joined: Nov 10, 2011 Posts: 789 Location: Lancashire, England
Audio files: 14
Posted: Sun Jun 03, 2012 12:51 pm Post subject:
frijitz wrote:
Looks good -- can't imagine why anyone would't like it! I use a similar slicer/dicer in my Wavolver waveshaper. In this one the chopped out segments can be replaced by a variable amplitude folded wave.
http://home.comcast.net/~ijfritz/sy_cir6.htm
An improved version is available from Elby.
Ian
Wow that looks incredible I'll have to have a proper look at it when I am more awake and can comprehend things.
I'm definitely interested in analogue waveshaping.
Cynosure wrote:
Cool. I think Richard has something similar in the Deatlahem machine. He has a video where he chops up a triangle wave like that.
I am not familiar with the deathlahem machine, I'd be interested to see how he does it.
Cynosure wrote:
Also, is that a pirate shirt you are wearing?
Yes. _________________ As a mad scientist I am ruled by the dictum of science: "I can't really be certain but I think I might have an idea"
Joined: Sep 27, 2009 Posts: 59 Location: Atlantic County, N.J. USA
Posted: Sun Jun 03, 2012 5:05 pm Post subject:
JingleJoe, that is fantastic. Another project that I have to add to my list. Can you use the output as a clock source? My guess with my limited knowledge would be that you could. I was thinking that if the signal was used to generate both the audio and a clock, the clock could be fed into a divider which could then be used to break up that signal feeding another oscillator, which would then enhance the pulsating sound. I hope I am explaining myself correctly, as I often confuse myself when I get these ideas.
Joined: Nov 10, 2011 Posts: 789 Location: Lancashire, England
Audio files: 14
Posted: Mon Jun 04, 2012 6:12 am Post subject:
Banjo wrote:
JingleJoe, that is fantastic. Another project that I have to add to my list. Can you use the output as a clock source? My guess with my limited knowledge would be that you could. I was thinking that if the signal was used to generate both the audio and a clock, the clock could be fed into a divider which could then be used to break up that signal feeding another oscillator, which would then enhance the pulsating sound. I hope I am explaining myself correctly, as I often confuse myself when I get these ideas.
It's never a bad thing to have ideas the only problem is being able to realize when they will or won't work or be good ideas.
Unfortunately this won't work as a clock for digital/logic circuits, they only accept square waves- 1 or 0, high or low. The saware-angle is an analogue wave with voltages occurring between 5 and 0 or whatever you set the comparator CV to.
However! Connect a scope to the output of the comparator and you will notice 5 volt square-ish signal that could be used with digital things,
also the triangle generator circuit I used was the standard 40106 schmitt oscillator with a bit of extra voltage conditioning to amplify the triangle wave from the cap, and then remove the offset from it too. This means that you can get a square wave from the schmitt oscillator, at the same frequency as the triangle wave, which is compatible with digital circuits
Phew! I feel out of breath after writing all that
PHOBoS wrote:
that looks interesting and sounds good too .
does make me wonder if I can get the same result with
the WaveWiper(shameless promotion )
Have no shame my good man, that's very relevant and it is a wonderful device with very interesting results. I have difficulty comprehending how it works though
Cynosure wrote:
After reviewing the video, it is not the same thing. But you can see M-like shapes. He also has an lfo controlling it.
interesting, but that seems to be another kettle of fish, I'll need to take a closer look to understand whats going on there, nevertheless, some intriguing waveforms indeed _________________ As a mad scientist I am ruled by the dictum of science: "I can't really be certain but I think I might have an idea"
Joined: Sep 27, 2009 Posts: 59 Location: Atlantic County, N.J. USA
Posted: Mon Jun 04, 2012 7:40 am Post subject:
Ok, so the output is analog. Somewhere I recall seeing a way to convert analog to digital, which would then give the results that I am looking for, if my assumption is correct. I have a parts order coming in this afternoon, containing the chips I need to do what I have in mind. That combined with my newly acquired scope will keep me occupied with this for a while. Your ideas and answers to my questions over the past few weeks, have been a real help, and for that I have to say thanks!! Another thing I will need to do is to start posting some video of the results.
Joined: Nov 10, 2011 Posts: 789 Location: Lancashire, England
Audio files: 14
Posted: Mon Jun 04, 2012 12:59 pm Post subject:
Banjo wrote:
Your ideas and answers to my questions over the past few weeks, have been a real help, and for that I have to say thanks!!
No problem, I am happy to help someone make more weird sounds
Converting the analogue signal to digital probably isn't quite what you're after, I can imagine that might be something like a voltage to frequency converter. You can just take a digital square wave the same frequency as the saware from the initial triangle oscillator to control digital or logic circuits, from which you can get signals to chop it up more.
Look into combining the saware wave with logic signals via a diode OR gate, I find heterodyning signals via gates to be the key to interesting sounds _________________ As a mad scientist I am ruled by the dictum of science: "I can't really be certain but I think I might have an idea"
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Saware-angle wave circuit
I'll have to have a proper look at it when I am more awake and can comprehend things.
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