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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 Aug 03, 2009 3:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

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

far left module
(its a dual 291)

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problemchild
melbourne australia
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Scott Stites
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Joined: Dec 23, 2005
Posts: 4121
Location: Mount Hope, KS USA
Audio files: 96

PostPosted: Mon Aug 03, 2009 7:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Luka and Photon,

Those are both really nice looking modules!

Cheerios,
Scott

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adambee7



Joined: Apr 04, 2009
Posts: 420
Location: united kingdom

PostPosted: Mon Aug 03, 2009 9:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

Very nice system you have there. Very Happy Very Happy
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Photon



Joined: Mar 22, 2005
Posts: 363
Location: Boston
Audio files: 1

PostPosted: Tue Aug 04, 2009 5:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Luka--nice looking panels. Very Happy Did you wind up etching them?

Thanks Scott. I appreciate you sharing your tap points and input mixer. cheers!
Here are a couple more pics:

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


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



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

PostPosted: Tue Aug 04, 2009 6:11 am    Post subject: Reply with quote  Mark this post and the followings unread

no i got a bit tired of using pnp, it really wasnt being reliable enough
so i started using lazertran
so much better imo

tho i might start etching more when ive finished my synth

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problemchild
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ericcoleridge



Joined: Jan 16, 2007
Posts: 885
Location: NYC

PostPosted: Sun Aug 09, 2009 11:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

99% done with my 291. This is the original Verbos dual layout. I need to re-wire it, it's a rats nest right now... but I was anxious to get it up and running:


IMG_1868.JPG
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IMG_1868.JPG



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IMG_1861.JPG


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numbertalk



Joined: May 05, 2008
Posts: 980
Location: Austin, TX
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PostPosted: Mon Aug 10, 2009 5:27 am    Post subject: Reply with quote  Mark this post and the followings unread

ericcoleridge wrote:
99% done with my 291. This is the original Verbos dual layout. I need to re-wire it, it's a rats nest right now... but I was anxious to get it up and running:


Looks great!
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frenchyinmunich



Joined: Jun 23, 2009
Posts: 105
Location: Germany

PostPosted: Sat Sep 05, 2009 8:58 am    Post subject: Mark verbos 291 clone component list Reply with quote  Mark this post and the followings unread

Hello,

Somebody here knows where I could find a component list of the Mark Verbos PCB 291 clone?

Regards,

F
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Luka



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

PostPosted: Sat Sep 05, 2009 6:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

i think it is somethign like this
this is for a single filter so double everything


1r / FB 2
47k 2
62k 1
1.5k 4
15k 2
68r 1
1m 1
100k 1
10k 4
4m7 1
6k8 4
68k 1
1k 3
220r 1
2m2 1
10m 2
100k trim 1
5k trim 1
5k6 1
33k 2
4k7 2
470r 1

100uf 50v 2
10uf 50 1
470p 1
220p 1
901p 1
47p 1
22p 1
22n 2
470n 1

tl082 1
tl084 1
5534 1
vtl5c3 4
2n3566 2
1n4148 1
1n5228 1

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problemchild
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frenchyinmunich



Joined: Jun 23, 2009
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PostPosted: Sun Sep 06, 2009 4:21 am    Post subject: Merci Reply with quote  Mark this post and the followings unread

Hi,

Perfect!!

Thank you very much!

F
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frenchyinmunich



Joined: Jun 23, 2009
Posts: 105
Location: Germany

PostPosted: Sun Sep 06, 2009 10:35 am    Post subject: 1r fb2 Reply with quote  Mark this post and the followings unread

Thanks again for the list.

But, what means the 1r FB2?

Thanks,

f
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frenchyinmunich



Joined: Jun 23, 2009
Posts: 105
Location: Germany

PostPosted: Sun Sep 06, 2009 10:55 am    Post subject: 291 component list Reply with quote  Mark this post and the followings unread

Again... The 910 pf...

Seems there's a problem...
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Scott Stites
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Joined: Dec 23, 2005
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Location: Mount Hope, KS USA
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PostPosted: Sun Sep 06, 2009 12:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

A 1000 pF (1 nF) will do you just fine.

Cheerios,
Scott

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KrIVIUM2323



Joined: Jan 01, 2009
Posts: 42
Location: Besancon/France/EU

PostPosted: Mon Sep 07, 2009 4:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
But, what means the 1r FB2?



1 ohm resistor or a ferrite Bead. You can use either resistor or ferrite bead type (two needed )(ferrite bead allow better filtering if you have 'noisy' modules on the same supply).
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Scott Stites
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Joined: Dec 23, 2005
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Location: Mount Hope, KS USA
Audio files: 96

PostPosted: Mon Sep 14, 2009 6:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

Super Yikes! I was just asked a question about the input mixer, and was shown that section of the schematic I'd uploaded - long story short, U4A and U4B (input mixer) was put into the schematic upside down! I found the schematic I drew (dated 2006) and corrected that part.

Many apologies to anyone who may have been led down that path....

Embarassed Embarassed Embarassed Embarassed

Here's the corrected version. Thanks, Photon.

Cheerios,
Scott


Modified_Buchla_291_corrected.JPG
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Corrected input mixer drawing.
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Luka



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

PostPosted: Mon Sep 14, 2009 6:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

oh i thought i pointed that out awhile ago
to anyone with my pcb version this correction was made

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problemchild
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Scott Stites
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PostPosted: Mon Sep 14, 2009 6:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm sure you did and I missed that part of the thread (I drift in and out of consciousness now and then); I'm glad it didn't zap you in any case.
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LetterBeacon



Joined: Mar 18, 2008
Posts: 454
Location: London, UK

PostPosted: Fri Dec 18, 2009 4:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

To Luka and Photon:

I just want to confirm that Luka's PCB layout works as in, with no modifications needed?

Thanks!
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Luka



Joined: Jun 29, 2007
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Location: Melb.

PostPosted: Fri Dec 18, 2009 5:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

my layout needs a couple of kludges in the mod section unfortunately but the core section works
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problemchild
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numbernone



Joined: Aug 16, 2006
Posts: 477
Location: new york city

PostPosted: Sat Dec 19, 2009 11:04 am    Post subject: Reply with quote  Mark this post and the followings unread

My 2 291s, which were built about a year apart behave completely different from one another. The first is quite tame and nice, while the second is a wicked beast that just loves to overload and distort in the worst/best fashion. Gonna be building the last one in 2010, and hope that I can dial it in to be very much on the money with Buchla, then I will have 3 kick ass filters from the same design.

It looks like by the end of next year there will be a lot more Buchla cloning than anyone previously imagined possible. Cant wait.
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Luka



Joined: Jun 29, 2007
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Location: Melb.

PostPosted: Sun Dec 20, 2009 1:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

same here

one is really aggressive the other is a bit more timid, i might change the vactrols the timid one

LetterBeacon i might be etching some more 291s next year so ill change the layout a little to fix the kludges and change the mods a little. i didnt use the processor, instead i set up opamp to buffer and mix the filters to run in parallel model, perhaps making a vero board arrangement might be more handy

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LetterBeacon



Joined: Mar 18, 2008
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PostPosted: Sun Dec 20, 2009 3:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Luka wrote:
LetterBeacon i might be etching some more 291s next year so ill change the layout a little to fix the kludges and change the mods a little. i didnt use the processor, instead i set up opamp to buffer and mix the filters to run in parallel model, perhaps making a vero board arrangement might be more handy


Excellent, I'll hold off etching the current PCB for a bit then.
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thermionicjunky



Joined: Dec 07, 2006
Posts: 72
Location: san francisco

PostPosted: Mon Dec 21, 2009 11:11 am    Post subject: Reply with quote  Mark this post and the followings unread

I also built a dual filter using Luka's layout. I'm pretty new to DIY and the project, including the kludge in the output buffer, was pretty easy. I love this filter. My filters behave quite similarly, with maybe a bit of difference in the gain trimmer settings. With the LP and HP taps, this is my ideal multimode. I knew that I wanted a vactrol-heavy modular, but now my appetite is insatiable. I want to build the Music Easel balanced modulator and I'm still hoping that someone will do a layout of a properly functioning vactrol panner.

Thanks to Luka, Scott, Mark and Don for the 291!
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LetterBeacon



Joined: Mar 18, 2008
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PostPosted: Mon Dec 21, 2009 12:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thats interesting to know. Are the kludges needed documented anywhere?
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thermionicjunky



Joined: Dec 07, 2006
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Location: san francisco

PostPosted: Mon Dec 21, 2009 12:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

LetterBeacon wrote:
Thats interesting to know. Are the kludges needed documented anywhere?


Luka sent out a diagram to the people using his boards. I believe that it was a simple matter of swapping pins 2 and 3 on the buffer IC. I suppose that you might as well wait for the layout to be redrawn, but it's not a big deal to correct it yourself if you can't wait.
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