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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Octave transvering puzzzzzzle!
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mike page



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PostPosted: Tue Apr 17, 2018 6:29 am    Post subject: Octave transvering puzzzzzzle! Reply with quote  Mark this post and the followings unread

Heres a little something which might sound cool:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

The puzzle is to make it so you only get one duty cycle per octave pulse like so:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

this example transverses 4 octaves but that is not a critical factor...

I think I have a possible solution but would like to see what you fine folk come up with Smile
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synaesthesia



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PostPosted: Tue Apr 17, 2018 10:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Not sure what you are looking for. Is it some effect similar to an arpeggio going up and down through the octaves? Then your solution is good. I would just feed the three selects to the highest three outputs of the 4016 so you can hear more than a few cycles of each octave frequency.
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mike page



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PostPosted: Tue Apr 17, 2018 11:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey, im after the output in the second drawing. So rather than 16 small pulses follow by 8 twice as big pulses followed by 4 twice as big pulses ... etc ... I was after a configuration that give 1 small pulse, followed by 1 twice as big, followed by 1 twice as big then back down again....
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mike page



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PostPosted: Tue Apr 17, 2018 11:49 am    Post subject: Reply with quote  Mark this post and the followings unread

And I think Im kind of after a sort of timbral thingy with it rather than arping.
But of course these things are cool and useful to run at audio or event rates!
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Blue Hell
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PostPosted: Tue Apr 17, 2018 12:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Maybe have a look at rate multipliers like http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=cd4089b&fileType=pdf or [ http://www.ti.com/product/CD4089B ] for the top level view.
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PHOBoS



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PostPosted: Tue Apr 17, 2018 7:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

a nice, another puzzle. Very Happy
Here's something that probably won't completely work, but it's a start.

note: U4 is a priority encoder


Octave transvering puzzle v2_1.gif
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Octave transvering puzzle v2_1.gif



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mike page



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PostPosted: Wed Apr 18, 2018 9:32 am    Post subject: Reply with quote  Mark this post and the followings unread

This is what I got, but I cant tell if it works or not!

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Last edited by mike page on Wed Apr 18, 2018 11:25 am; edited 1 time in total
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synaesthesia



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PostPosted: Wed Apr 18, 2018 11:01 am    Post subject: Reply with quote  Mark this post and the followings unread

Haven't looked at the output with a scope, but this is how it sounds.


Octave transvering puzzzzzzle!.mp3
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mike page



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PostPosted: Wed Apr 18, 2018 11:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Ha! Cool! Is that the circuit I just posted?

I guess its easy for my circuit to go out of sync so it outputs something else. Therefore, proding the reset on the 2nd part of the 4520 should put out different pulse patterns.

And also might get some freaky peaks adding the ol' steppy triangle XOR trick to it...

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Last edited by mike page on Wed Apr 18, 2018 11:45 am; edited 1 time in total
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PostPosted: Wed Apr 18, 2018 11:39 am    Post subject: Reply with quote  Mark this post and the followings unread

I did a quick simulation with digital works and it works about 50%. I'll have to draw a timing diagram to see what exactly is happening.
Or maybe someone can use some software that does that. I was thinking about the reset too but sofar it doesn't actually seem to
matter. I think it just changes the phase compared to something else running from the same clock, but the pattern stays the same.

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