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 Forum index » DIY Hardware and Software
Scott Stites/Buchla 291 adaptation
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Luka



Joined: Jun 29, 2007
Posts: 1002
Location: Melb.

PostPosted: Mon Dec 21, 2009 1:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

yeh there isnt anything too big to fix, if you want to etch them now let me know via pm and ill send through the files
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Luka



Joined: Jun 29, 2007
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PostPosted: Sat Dec 26, 2009 5:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

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 Smile

<removed>

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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
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Location: London, UK

PostPosted: Sun Dec 27, 2009 4:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Brilliant, thanks for the Christmas present!
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TekniK



Joined: Aug 10, 2008
Posts: 1062

PostPosted: Wed Nov 03, 2010 4:26 am    Post subject: Reply with quote  Mark this post and the followings unread

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

PostPosted: Wed Nov 03, 2010 8:31 am    Post subject: Reply with quote  Mark this post and the followings unread

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...


b291_1.jpg
 Description:
Buchla 291 PCB component side
 Filesize:  72.32 KB
 Viewed:  151 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

b291_1.jpg



b291_3.jpg
 Description:
Buchla 291 PCB traces
 Filesize:  73.25 KB
 Viewed:  160 Time(s)
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b291_3.jpg



b291_2.jpg
 Description:
Buchla 291 front panel back
 Filesize:  58.11 KB
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b291_2.jpg


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TekniK



Joined: Aug 10, 2008
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PostPosted: Wed Nov 03, 2010 12:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Beauty!
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Peake



Joined: Jun 29, 2007
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Location: Loss Angeles
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PostPosted: Tue Feb 22, 2011 1:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

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.

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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
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PostPosted: Tue Feb 22, 2011 6:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

ill check mine when i get a chance but im pretty sure both my 291s will cut off completely in all modes
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Luka



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PostPosted: Wed Feb 23, 2011 1:54 am    Post subject: Reply with quote  Mark this post and the followings unread

no wait im making stuff up
you are correct mike

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questionable



Joined: Aug 27, 2006
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Location: southern california

PostPosted: Wed Feb 23, 2011 9:59 am    Post subject: Reply with quote  Mark this post and the followings unread

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!

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Peake



Joined: Jun 29, 2007
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PostPosted: Wed Feb 23, 2011 12:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Luka wrote:
no wait im making stuff up
you are correct mike


I don't want to be correct! Think, what to do? Cool

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!

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arnoid



Joined: Aug 23, 2009
Posts: 55
Location: Belgium

PostPosted: Thu Feb 24, 2011 3:44 am    Post subject: Reply with quote  Mark this post and the followings unread

I also gonna build this one, after building the 292 I really like the "vactrol" sound Smile

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 ?

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Scott Stites
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PostPosted: Thu Feb 24, 2011 5:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

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!

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arnoid



Joined: Aug 23, 2009
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Location: Belgium

PostPosted: Fri Feb 25, 2011 12:29 am    Post subject: Reply with quote  Mark this post and the followings unread

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 Smile

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kupfer_m



Joined: Oct 14, 2010
Posts: 48
Location: Belgium

PostPosted: Wed Mar 23, 2011 6:42 am    Post subject: Reply with quote  Mark this post and the followings unread

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
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Location: Melb.

PostPosted: Wed Mar 23, 2011 10:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

the orientation is reverse from normal - this is from mark verbos' layout
you can orientate yourself from the IC layout

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Peake



Joined: Jun 29, 2007
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PostPosted: Mon Mar 28, 2011 12:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

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.

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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
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Location: Belgium

PostPosted: Sun May 08, 2011 6:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Finished a dual 291 vcf Smile 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.

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mph



Joined: Aug 25, 2007
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Location: France

PostPosted: Tue May 10, 2011 4:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

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
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PostPosted: Wed May 11, 2011 2:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

they are part of the processor circuit. i added them there to avoid having them flying between CV input and processor potentiometers

see here:

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

sorry about the mistake
ill try fix it up asap

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mph



Joined: Aug 25, 2007
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PostPosted: Wed May 11, 2011 3:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

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
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PostPosted: Thu May 12, 2011 2:52 am    Post subject: Reply with quote  Mark this post and the followings unread

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

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mph



Joined: Aug 25, 2007
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PostPosted: Sat May 14, 2011 4:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

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 Cool
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brother303



Joined: Nov 02, 2010
Posts: 139
Location: ruhr-area/germany

PostPosted: Tue May 17, 2011 12:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

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 Lucas´ v3-pcb?

Thanks and kind regards
Greg

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Peake



Joined: Jun 29, 2007
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PostPosted: Wed May 18, 2011 12:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

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?
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