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autowitch

Joined: Nov 19, 2011 Posts: 12 Location: Denver, CO
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Draal

Joined: May 18, 2010 Posts: 306 Location: Oak Park, IL
Audio files: 5
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Posted: Wed Mar 20, 2013 6:45 am Post subject:
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Super build there .
That's alien abduction music in my book! _________________ Zontar Prevails! |
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analog_backlash

Joined: Sep 04, 2012 Posts: 393 Location: Aldershot, UK
Audio files: 21
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Posted: Tue Mar 26, 2013 4:23 am Post subject:
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Hi Autowitch.
I've only just got round to listening/watching these posts (I had to be in a patient mood because, as you say, they are quite long!). Really like some of the sounds that you're getting. I'm building a lunetta at the moment (I will post very soon - I keep saying that).
Draal wrote: | Super build there . |
Ditto.
Just wondered which circuits you've used for pitch tracking (a 4046-based circuit?) and the shift registers. I have lots of schematics in my collection, but I'm not sure which ones to try.
Keep up the good work,
Gary |
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autowitch

Joined: Nov 19, 2011 Posts: 12 Location: Denver, CO
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Posted: Fri Mar 29, 2013 1:29 pm Post subject:
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Hey Gary,
I'm looking forward to seeing what you are working on!
I used this thread for the pitch tracker. I used the 4049/4046 version (more specifically the breadboarded one in the middle of the thread).
http://electro-music.com/forum/topic-51275.html
The pitch tracker can vary pretty wildly depending on the manufacturer you use for the chips. I don't quite get the laser bloops that some people do, but I do get a nice texture of gurgles. I'm planning on building another one using a different source for the 4046 and seeing what happens.
I suspect that tweaking the caps will lead to some pretty dramatic changes in the behavior. (You must build a pitch tracker; I can't recommend it enough).
For the shift registers, I started with this:
http://electro-music.com/emsynth/PseudoRandom.html
I only have one bit hooked up. I wasn't sure how to seed the bits going into the shift register, so I added a push button going from hot to one of the legs of the XOR input. That effectively gives me a bit toggle that I can use to seed the shift register as it starts or to tweak it when it runs.
I think using an XNOR instead of an XOR may handle this problem on its own; but I've decided that I like the manual tweaking.
I made two outputs for the "random" bits. One is just like it's seen in the emSynth schematic. The other ANDs the bit with the clock; that would give a pulse output. This could be fun if combined with the drum circuits found here: http://electro-music.com/forum/topic-52786.html
The eventual plan is to create four of these using the various XOR connections in the emSynth version. That should provide a source for 4 bit random numbers that could be used for all sorts of things.
-aw |
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RingMad

Joined: Jan 15, 2011 Posts: 347 Location: Montreal, Canada
Audio files: 3
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Posted: Sat Mar 30, 2013 6:19 am Post subject:
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autowitch wrote: | The eventual plan is to create four of these using the various XOR connections in the emSynth version. That should provide a source for 4 bit random numbers that could be used for all sorts of things. |
If you are interested, there was some discussion of a few other 4-bit pseudo-random generators here: http://electro-music.com/forum/topic-52066.html
James. |
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Dogenigt

Joined: Oct 25, 2009 Posts: 48 Location: Denmark
Audio files: 4
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Posted: Mon Apr 01, 2013 9:42 am Post subject:
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autowitch wrote: |
The pitch tracker can vary pretty wildly depending on the manufacturer you use for the chips. I don't quite get the laser bloops that some people do, but I do get a nice texture of gurgles. I'm planning on building another one using a different source for the 4046 and seeing what happens.
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Hi aw, try unplugging your ground connection to your 4046, I did that with my CD4046BE and suddenly the lazer sweeps came on! very strange...! _________________ www.dogenigt.com
Everything should be made as simple as possible, but no simpler. - Albert Einstein |
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