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 Forum index » DIY Hardware and Software
5P XOR 5P
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frijitz



Joined: May 04, 2007
Posts: 1712
Location: NM USA
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PostPosted: Thu Jul 19, 2007 3:40 pm    Post subject: 5P XOR 5P
Subject description: Mutually macerating mutant mangled pulse trains
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Scott Juskiw recently put up his Doomsday Machine project,
http://www.tellun.com/motm/diy/tln712/TLN-712.html
part of which is based on the old Craig Anderton Pulse Width Modulator published in Polyphony.

The PW Modulator is based on a string of XOR gate combining different pulse trains, and gives some pretty radical sounds.

So I thought it woud be interesting to feed two of my 5Pulser waveshapers into an XOR and see what came out. Well, it sure gives you a bunch of wild sounds.

Here's a short demo with four sections. One shaper is given a slow modulation and the other a faster one. The first three sections represent different shape and modulation settings. The fourth one begins with the signal from a sawtooth multiphase animator (similar to the EN design) into which is blended the XOR output. The result is a sort of animation with an attitude.

I think there is some interesting territory combining wave shaping with wave animation. Has anyone else been exploring this?

Ian


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Last edited by frijitz on Mon Aug 20, 2007 3:29 pm; edited 2 times in total
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EdisonRex
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PostPosted: Thu Jul 19, 2007 4:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Funny thing, I've been thinking along the same lines. I had even picked up some chips to play with, for when I got home and built one of your circuits.

You're just way ahead of me, Ian. Smile

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frijitz



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PostPosted: Thu Jul 19, 2007 4:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

EdisonRex wrote:
Funny thing, I've been thinking along the same lines.


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EdisonRex
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PostPosted: Thu Jul 19, 2007 7:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Well it was the discussion of the 5pulser that started it, of course. Your output stage for the 5 pulser outputs being basically an OR gate, made me think of a couple of things. If you could combine pulse lengths via an OR gate, you could get some interesting variable pulse widths.

And I was thinking of what happens when you use some different logic. It's been raining here at the beach so I have had time to sit around and sketch logic tables. Wink

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frijitz



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PostPosted: Sun Jul 22, 2007 11:13 am    Post subject: More 5P experiments Reply with quote  Mark this post and the followings unread

To extend the capability of my box with two 5Pulsers in it, I have added a "switch-hitter" circuit to combine the outputs as a signal going from A-B through A to A+B. This gives an interesting variety of multi-step waveforms.

To further explore the idea of getting sounds with both animation and timbre modulation, I put together some patches using both (1) the 5Pulser with the multistep output and (2) a second sawtooth VCO detuned from the one driving the pulser. The second SAW was run through a phase shifter modulated by an LFO. The pulser timbre was also modulated with LFO's. A third FM'd VCO was added in some of the patches. For the demo, a fair amount of plate reverb was added to keep the sound pretty smooth. Here's a short clip of some of the sounds I got:


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Last edited by frijitz on Mon Aug 20, 2007 3:32 pm; edited 1 time in total
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guitarfool



Joined: Feb 26, 2007
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PostPosted: Tue Jul 24, 2007 7:55 pm    Post subject: Re: 5P XOR 5P
Subject description: Mutually macerating mutant mangled pulse trains
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frijitz wrote:
Scott Juskiw recently put up his Doomsday Machine project


Yep. I got 2 of them, but haven't built them yet. I built the Digisound version of the sawtooth wave animator long ago, and found that you really need to be able to tweak the LFOs, which can be done with Scotts version.


frijitz wrote:
I think there is some interesting territory combining wave shaping with wave animation. Has anyone else been exploring this?


Very interesting territory! I'm still looking for the perfect alien hurdy-gurdy drone. Or a choir of dijeridoos.

I just finished your 5pulser, and have been playing with it a little bit. First thing I did was feed it from Ken Stone's wave multiplier.

Now you got me thinking of feeding the 5pulser into my sub-oscillator/divider. . . .
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frijitz



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PostPosted: Wed Jul 25, 2007 5:18 pm    Post subject: Re: 5P XOR 5P
Subject description: Mutually macerating mutant mangled pulse trains
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guitarfool wrote:
I just finished your 5pulser, and have been playing with it a little bit. First thing I did was feed it from Ken Stone's wave multiplier.

Now you got me thinking of feeding the 5pulser into my sub-oscillator/divider. . . .

Hey, glad you got it working! But feeding it with a wave tripler? Shocked That's got to be a lot of pulses. Cool

Please keep us posted as you experiments progress.

Ian
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