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Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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Posted: Sat Dec 26, 2009 5:15 pm Post subject:
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here you go
i left the processor on there, it can be turned into a normal mixer pretty easy
the pdf shows the blocks so you can work out which bits not to populate if you dont want to use it
i beefed up the ground and rail traces too
<removed> _________________ problemchild
melbourne australia
http://cycleofproblems.blogspot.com/
http://www.last.fm/user/prblmchild Last edited by Luka on Fri May 20, 2011 3:57 pm; edited 1 time in total |
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LetterBeacon
Joined: Mar 18, 2008 Posts: 454 Location: London, UK
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Posted: Sun Dec 27, 2009 4:15 am Post subject:
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Brilliant, thanks for the Christmas present! |
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TekniK
Joined: Aug 10, 2008 Posts: 1059
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Posted: Wed Nov 03, 2010 4:26 am Post subject:
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somebody knows where i can find the original schematic of this one (not any re-draw)? |
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beautyofdecay_
Joined: Aug 14, 2009 Posts: 38 Location: Netherlands
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Posted: Wed Nov 03, 2010 8:31 am Post subject:
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Here is the original schematic: http://rubidium.dyndns.org/~magnus/synths/companies/buchla/Buchla_2910_150.jpg
And pics of the the PCB and front panel back...
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Buchla 291 PCB component side |
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Buchla 291 front panel back |
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TekniK
Joined: Aug 10, 2008 Posts: 1059
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Posted: Wed Nov 03, 2010 12:25 pm Post subject:
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Thanks Beauty! |
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Peake
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
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Posted: Tue Feb 22, 2011 1:52 pm Post subject:
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Using both VTL5C3 and VTL5C1, my 291 adaptations (second to last Luka/Funkyfarm) do not close completely (any of the three filter modes passes up to around 100Hz, on a guess, probably higher). With res up, the BPF goes up to and past audibility, with some range left on the Fc pot, so I'm looking for a way to drop the overall Fc a bit. Edit: 910pf instead of .001uF fixed the Fc problem.
Loving this, thank you to everyone. Would love to get a logic solution to have gate pulses switch between response modes to a single output.
Also note that it sounds and responds just the same with the 5C1, which are going for $2.00 each at allelectronics.com, part number VTL5C1. Same response times as the 5C3.
Edit: 5C1 are sold out. _________________ We are selling emotions, there are no emotions in a grid. -mwagener
"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog Last edited by Peake on Fri Jun 17, 2011 1:11 pm; edited 1 time in total |
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Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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questionable
Joined: Aug 27, 2006 Posts: 42 Location: southern california
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Posted: Wed Feb 23, 2011 9:59 am Post subject:
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I'm going to add this to my project list (and probably bump it to the top).
Luka: Is your rev3 pdf above the final version, with everything working correctly?
Great layout! _________________ Sounds Questionable |
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Peake
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
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Posted: Wed Feb 23, 2011 12:00 pm Post subject:
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Luka wrote: | no wait im making stuff up
you are correct mike |
I don't want to be correct! Think, what to do?
Edit: I don't remember if the 291-style BPF on my old Buchla 212 closed more than this build; I do remember it whoomping into the bass due to the non-linear response curve. Thanks Luka! _________________ We are selling emotions, there are no emotions in a grid. -mwagener
"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog |
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arnoid
Joined: Aug 23, 2009 Posts: 57 Location: Belgium
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Posted: Thu Feb 24, 2011 3:44 am Post subject:
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I also gonna build this one, after building the 292 I really like the "vactrol" sound
Luka wrote: |
i left the processor on there, it can be turned into a normal mixer pretty easy |
How ? Can you explain this a bit plz ? _________________ http://www.soundcloud.com/arnoid
http://www.facebook.com/arnoid |
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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 Feb 24, 2011 5:53 pm Post subject:
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Quote: | I do remember it whoomping into the bass due to the non-linear response curve. |
I've wondered about that for years....thanks for mentioning it! _________________ My Site |
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arnoid
Joined: Aug 23, 2009 Posts: 57 Location: Belgium
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Posted: Fri Feb 25, 2011 12:29 am Post subject:
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arnoid wrote: | Luka wrote: |
i left the processor on there, it can be turned into a normal mixer pretty easy |
How ? Can you explain this a bit plz ? |
Ignore this dumb question it's already in your layout _________________ http://www.soundcloud.com/arnoid
http://www.facebook.com/arnoid |
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kupfer_m
Joined: Oct 14, 2010 Posts: 48 Location: Belgium
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Posted: Wed Mar 23, 2011 6:42 am Post subject:
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Hi,
One question regarding Luka's layout:
Are the components in the parts view viewed from the copper side instead of the usual top view most of us use... or do I miss something? |
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Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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Peake
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
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Posted: Mon Mar 28, 2011 12:13 pm Post subject:
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There is definitely an issue here- I note that the Buchla 291 front panel lists a frequency range from 30Hz up. My builds are not closing to 30Hz.
Edit: Got some 910pf caps as spec'd in the original and replaced the .001 I had been using. Also swapped power in resistors to the 1R as indicated on the original Verbos design. Now closes nicely. _________________ We are selling emotions, there are no emotions in a grid. -mwagener
"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog Last edited by Peake on Tue May 10, 2011 2:11 pm; edited 1 time in total |
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arnoid
Joined: Aug 23, 2009 Posts: 57 Location: Belgium
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Posted: Sun May 08, 2011 6:05 am Post subject:
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Finished a dual 291 vcf Very nice/versatile sounding filters...
A note for other builders I used the V3 layout of luka and there's a litlle kludge: pin 2 and 3 of the tl082 are mixed up so you have to cut the traces to these pins and solder wire's to have a working mixer section. _________________ http://www.soundcloud.com/arnoid
http://www.facebook.com/arnoid |
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mph
Joined: Aug 25, 2007 Posts: 87 Location: France
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Posted: Tue May 10, 2011 4:55 pm Post subject:
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I'd like to build this filter since I've seen this topic, but some things are not clear for me (still too noob ).
You're right about the pin 2 and 3 of the 082 in the mix section... here a small redesign could be great: using the three 200K resistors as jumper above the -V track to allow the 100nF cap to be connected to ground isn't it?
but what is the purpose of the two 100K resistors near the psu connector? |
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Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
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Posted: Wed May 11, 2011 2:32 pm Post subject:
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they are part of the processor circuit. i added them there to avoid having them flying between CV input and processor potentiometers
see here:
sorry about the mistake
ill try fix it up asap _________________ problemchild
melbourne australia
http://cycleofproblems.blogspot.com/
http://www.last.fm/user/prblmchild |
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mph
Joined: Aug 25, 2007 Posts: 87 Location: France
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Posted: Wed May 11, 2011 3:13 pm Post subject:
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Thanks Luka
do you have a full schematic with this mod included? I've checked again thru the 7 pages of this topic and I've only seen the redrawn version from Scott Stites which does not show the CV processor.
That would be very helpful for me to figure out the whole wiring.
And just to be sure, R47 should be a trimmer even if it appears as a fixed resistor on Scott's version isn't it? |
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arnoid
Joined: Aug 23, 2009 Posts: 57 Location: Belgium
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Posted: Thu May 12, 2011 2:52 am Post subject:
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mph wrote: | That would be very helpful for me to figure out the whole wiring. |
You can use the wiring from the schematic luka posted it's the same.
mph wrote: | Thanks Luka
And just to be sure, R47 should be a trimmer even if it appears as a fixed resistor on Scott's version isn't it? |
yep _________________ http://www.soundcloud.com/arnoid
http://www.facebook.com/arnoid |
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mph
Joined: Aug 25, 2007 Posts: 87 Location: France
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Posted: Sat May 14, 2011 4:01 pm Post subject:
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Thanks arnoid,
concerning the wiring, I was just thinking there could be some interconnections between the voltage processor and the rest of the circuit... but it appears it's not the case indeed. Sorry for that stupid request |
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brother303
Joined: Nov 02, 2010 Posts: 139 Location: ruhr-area/germany
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Posted: Tue May 17, 2011 12:04 pm Post subject:
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Hi Arnoid,
arnoid wrote: | A note for other builders I used the V3 layout of luka and there's a litlle kludge: pin 2 and 3 of the tl082 are mixed up so you have to cut the traces to these pins and solder wire's to have a working mixer section. |
Which 082 exactly? The lower one (next to the lp/bp/hp-outs) on the left side on LucasĀ“ v3-pcb?
Thanks and kind regards
Greg _________________ Best regards
Greg |
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Peake
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
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Posted: Wed May 18, 2011 12:40 pm Post subject:
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In the above pic of the original PCB, I note a pair of silver mica caps in each filter. Wonder if those are the .022s? _________________ We are selling emotions, there are no emotions in a grid. -mwagener
"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog |
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