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vtl5c3
Joined: Sep 08, 2006 Posts: 425 Location: PDX
Audio files: 13
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Posted: Mon Dec 08, 2008 6:38 pm Post subject:
Buchla 208 Random PCB |
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Based on this schematic by Scott Stites:
http://electro-music.com/forum/phpbb-files/buchla208_randv_532.png
It's a cool little random voltage generator. It uses the CD4015 as its core, has only one pulse input and four pseudo random CV outputs. The board layout has been confirmed. I've built one of these units and think that it's lots of fun. It does a lot for the tiny amount of panel space that it takes up.
I appear to be out of file space on electro music, so I'm posting these external links until I find a better home for them:
First the PCB, then PCB with parts placement.
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208_URV_PCB.pdf |
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208_URV_PCB_Parts.pdf |
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77.29 KB |
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2930 Time(s) |
Last edited by vtl5c3 on Tue Dec 09, 2008 7:25 am; edited 1 time in total |
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ericcoleridge

Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Mon Dec 08, 2008 6:53 pm Post subject:
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Super Cool! Thanks VTL5C3! |
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Blue Hell
Site Admin

Joined: Apr 03, 2004 Posts: 24033 Location: The Netherlands, Enschede
Audio files: 276
G2 patch files: 320
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Posted: Mon Dec 08, 2008 6:55 pm Post subject:
Re: Buchla 208 Random PCB |
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vtl5c3 wrote: | I appear to be out of file space | Fixed! _________________ Jan
also .. could someone please turn down the thermostat a bit.
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vtl5c3
Joined: Sep 08, 2006 Posts: 425 Location: PDX
Audio files: 13
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Posted: Mon Dec 08, 2008 7:10 pm Post subject:
Re: Buchla 208 Random PCB |
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Woot!
And now to give you an earful of what this module can do. Two samples of the RND 208 playing 4 VCOs, just a steady pulse clock driving it. First track without FM, the second with. I'm just fading channels in and out manually to experiment with different mixes of the 4 VCOs being randomly played. I can't get over how complex the random melodies get with no pots to set anything.
http://web.pdx.edu/~rfahl/Audio/208rnd_4vcos.mp3
http://web.pdx.edu/~rfahl/Audio/208rnd_4vcos_w_FM.mp3
Blue Hell wrote: | vtl5c3 wrote: | I appear to be out of file space | Fixed! |
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Luka

Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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Posted: Mon Dec 08, 2008 10:10 pm Post subject:
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i have a bit of space left on my dual wogglebug panel so i could of these might be the ticket. good stuff, thanks for sharing
can you link the real schematic instead of the thumbnail pls vtl
i cant seem to get anything out of it except pixels _________________ problemchild
melbourne australia
http://cycleofproblems.blogspot.com/
http://www.last.fm/user/prblmchild Last edited by Luka on Tue Dec 09, 2008 3:31 pm; edited 1 time in total |
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Quad
Joined: Dec 30, 2006 Posts: 18 Location: Stockholm, Sweden
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Funky40
Joined: Sep 24, 2005 Posts: 875 Location: Swiss
Audio files: 1
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Posted: Tue Dec 09, 2008 1:21 pm Post subject:
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Thanks VTL
i will make a euroversion with printmounted jacks.
It is mostly drawn allready based on VTLs artwork |
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/mr

Joined: Aug 05, 2007 Posts: 223 Location: Elektron City, Sweden
Audio files: 1
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Posted: Tue Dec 09, 2008 2:01 pm Post subject:
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Few components, no critical layout.
Almost easier to build on veroboard?  |
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andrewF

Joined: Dec 29, 2006 Posts: 1176 Location: australia
Audio files: 4
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Posted: Tue Dec 09, 2008 3:44 pm Post subject:
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I like the MP3s
inspires me to build one of these.
seems a pity to waste three sections of the 4016, would it be worth/work connecting the spare 4016 switches to three of the CV outputs and getting 3 psuedo random gate sources? |
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Photon

Joined: Mar 22, 2005 Posts: 363 Location: Boston
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Posted: Wed Dec 10, 2008 8:08 am Post subject:
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Funny, I was just last week looking over the schematic for this and drawing up a parts list so I could breadboard it. awesome work, vtl5c3.
Maybe this could coexist behind a panel with the sample and hold from the Buchla 266 Source of Uncertainty. If I remember correctly that uses just 2 sections of a 4016.
p |
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vtl5c3
Joined: Sep 08, 2006 Posts: 425 Location: PDX
Audio files: 13
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Posted: Wed Dec 10, 2008 9:03 am Post subject:
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Why would anyone want to clone the Buchla 266?
I'm cleaning up my board layouts (also press & peel) for the 266 and will post them as I finish. It's a great module... actually 5 modules behind one panel. |
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Photon

Joined: Mar 22, 2005 Posts: 363 Location: Boston
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Posted: Wed Dec 10, 2008 9:22 am Post subject:
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ringer

Joined: Feb 20, 2007 Posts: 49 Location: montreal
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Posted: Wed Dec 10, 2008 2:07 pm Post subject:
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Please, elaborate some more, thanks.
R
andrewF wrote: | I like the MP3s
inspires me to build one of these.
seems a pity to waste three sections of the 4016, would it be worth/work connecting the spare 4016 switches to three of the CV outputs and getting 3 psuedo random gate sources? |
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Scott Stites
Janitor


Joined: Dec 23, 2005 Posts: 4127 Location: Mount Hope, KS USA
Audio files: 96
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Posted: Thu Dec 11, 2008 11:00 am Post subject:
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I think what Andrew is getting at is one could feed a switch input with +V (or whatever level you like your gates), then run the control switch from one of the shift register outputs to each of the switch controls. This would produce a gate every time each of the connected register outputs went high.
This is pretty cool, VTL5C3 - I love those samples. I always thought this would make a great addition to a home-built SOU. Jeff Pontius and I got into the SOU functions - Jeff actually built one in MOTM format. I, on the other hand, got distracted....
The design we worked on replaced the MM noise chip, which is close to unobtanium, with a white noise to comparator circuit. It actually worked out pretty well. The MM noise chip was cyclical; this setup wouldn't be. Peter Grenader was of the opinion that the cyclical nature of the noise IC gave the 266 SOU it's own noise flavor. I'm not a fan of cyclical digital noise, but I've never played with a real 266, so, couldn't tell ya.
The fluctuating random voltage function of the 266 SOU is the schnitz.
Cheers,
Scott _________________ My Site |
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ericcoleridge

Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Sat Dec 13, 2008 9:26 pm Post subject:
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I was looking at the Music Easel panel layout, and can't really tell, so i wanted to ask here, are all 4 Random ouputs sent to their own banana jacks on the Music Easel? I do see 4 grey banana jacks along the bottom row of jacks on the front panel, but they aren't labeled. Just curious. |
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cbm

Joined: Oct 25, 2005 Posts: 381 Location: San Francisco
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Posted: Sat Dec 13, 2008 9:39 pm Post subject:
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ericcoleridge wrote: | I was looking at the Music Easel panel layout, and can't really tell, so i wanted to ask here, are all 4 Random ouputs sent to their own banana jacks on the Music Easel? I do see 4 grey banana jacks along the bottom row of jacks on the front panel, but they aren't labeled. Just curious. |
Yes, each jack gets a unique random voltage. The four uncorrelated random outputs are one of my favorite Easel design features. _________________ Chris Muir
http://www.eardrill.com <– My jobby (more than a hobby, less than a job) |
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vtl5c3
Joined: Sep 08, 2006 Posts: 425 Location: PDX
Audio files: 13
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Posted: Sat Dec 13, 2008 9:58 pm Post subject:
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I recently tried an experiment with the 4 outputs, feeding them into separate inputs on a CGS matrix mixer. I set the mixer into bipolar mode and fed four of its outputs into a dedicated VCO. All of a sudden, I was able to sculpt the pseudorandom sequences going into each voice. In a weird kind of way, it reminded me of Klee.  |
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cbm

Joined: Oct 25, 2005 Posts: 381 Location: San Francisco
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Posted: Sat Dec 13, 2008 10:31 pm Post subject:
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Scott Stites wrote: | The fluctuating random voltage function of the 266 SOU is the schnitz. |
It really is.
Random yet vaguely periodic, a beautiful thing. _________________ Chris Muir
http://www.eardrill.com <– My jobby (more than a hobby, less than a job) |
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Luka

Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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cbm

Joined: Oct 25, 2005 Posts: 381 Location: San Francisco
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Posted: Sat Dec 13, 2008 11:29 pm Post subject:
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Luka wrote: | is the fluctuating random voltage the basis of the wogglebug? |
Yes, I think so. _________________ Chris Muir
http://www.eardrill.com <– My jobby (more than a hobby, less than a job) |
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vtl5c3
Joined: Sep 08, 2006 Posts: 425 Location: PDX
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Posted: Sun Dec 14, 2008 9:32 am Post subject:
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I think so. Either that, or the Buchla 265 SOU, which is very similar to the Fluctuating Random Voltage section in the 266.
Luka wrote: | is the fluctuating random voltage the basis of the wogglebug? |
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ericcoleridge

Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Mon Dec 15, 2008 10:02 pm Post subject:
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vtl5c3 wrote: | I recently tried an experiment with the 4 outputs, feeding them into separate inputs on a CGS matrix mixer. I set the mixer into bipolar mode and fed four of its outputs into a dedicated VCO. All of a sudden, I was able to sculpt the pseudorandom sequences going into each voice. In a weird kind of way, it reminded me of Klee.  |
Yeah, I often think it would be cool to build a Serge-style shop panel of a bunch of the CGS 'random' circuits-- Digital Noise, Gated Comparator, Infinite Melody, Modulo Magic, Weighted Random Switch...Many of these seem to be very closely related to the Source of Uncertainty and other Serge 'random' modules. |
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funkyfarm

Joined: Jan 21, 2007 Posts: 583 Location: France
Audio files: 3
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Posted: Sat Dec 20, 2008 1:10 am Post subject:
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Waouhhh ! Easel flavour !
Did I say "AMAZING !" yet ?
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funkyfarm

Joined: Jan 21, 2007 Posts: 583 Location: France
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Posted: Sun Dec 21, 2008 12:53 am Post subject:
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http://electro-music.com/forum/viewtopic.php?highlight=218&t=19064
Coupled with your 218 vc-portamento, you can emulate the clock rate/slew time correlation, as on the 266, if using the same signal (1V/oct, velocity...) for controlling both parameters (S&H pulse input and Portamento cv input), aren't you ? |
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ericcoleridge

Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Sun Dec 21, 2008 8:56 pm Post subject:
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funkyfarm wrote: |
Coupled with your 218 vc-portamento, you can emulate the clock rate/slew time correlation, as on the 266, if using the same signal (1V/oct, velocity...) for controlling both parameters (S&H pulse input and Portamento cv input), aren't you ? |
Funkyfarm, would you elaborate on this some? You use the same CV to control Clock Rate and Slew Time? Then what signal do you send to the 218 VC Slew-- one of the Random outputs? |
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