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



Joined: Aug 25, 2007
Posts: 67
Location: France

PostPosted: Wed May 18, 2011 2:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

brother303 wrote:

Which 082 exactly? The lower one (next to the lp/bp/hp-outs) on the left side on Lucas´ v3-pcb?


Nope, it's the 82 which is on the middle of the left side of the pcb (U4 on the corrected schemo). The one which has three 200K resistors connected to its pin 3 on the pcb. That's the mix input section of the circuit and not the output.

You can compare to the wiring of the other 82 in the LP/BP/HP output section which is correctly connected (U5 on the corrected schematic): pin 3 should be connected to ground.
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brother303



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

PostPosted: Wed May 18, 2011 4:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi,

thanks mph,that`s what I needed to know.

thumright

Cheers!

Wink

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Greg
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Luka



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

PostPosted: Fri May 20, 2011 3:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

fixing the layout now

i didn't use the processor
should i replace it with another mixer / buffer arrangement?
it means if you use 2 or more boards you can run in parallel mode

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problemchild
melbourne australia
http://cycleofproblems.blogspot.com/
http://www.last.fm/user/prblmchild
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Luka



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

PostPosted: Fri May 20, 2011 3:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

here you go
v4

fixed the mixer section - didn't change anything else

it would be nice to completely redesign this pcb so it doesn't have all the wire links. i tried to maintain mark's filter section and it made it hard to add lots of extra circuitry without wasting space.


291_rev4.pdf
 Description:
291 with mods

Download
 Filename:  291_rev4.pdf
 Filesize:  745.76 KB
 Downloaded:  353 Time(s)


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problemchild
melbourne australia
http://cycleofproblems.blogspot.com/
http://www.last.fm/user/prblmchild
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brother303



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

PostPosted: Sat May 21, 2011 8:41 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi,

thanks for offering this update,cool!

No more bugs and kludges now?

Thank god,I didn´t etch the older version ´til now... Wink

Cheers.

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Greg
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Peake



Joined: Jun 29, 2007
Posts: 1109
Location: Loss Angeles
Audio files: 3

PostPosted: Sat May 21, 2011 11:19 am    Post subject: Reply with quote  Mark this post and the followings unread

I'd love to see a dual version like Verbos' but with the multiple output types, perhaps using a single buffer with switching for the Type. Of course, it's always nice to have independent outputs...
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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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Luka



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

PostPosted: Sat May 21, 2011 3:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

brother303 wrote:
Hi,

thanks for offering this update,cool!

No more bugs and kludges now?

Thank god,I didn´t etch the older version ´til now... Wink

Cheers.


cant be sure - i haven't tested it and wont have time until 2013 as i'm about to travel overseas for a few years - my studio is all packed up.

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problemchild
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http://cycleofproblems.blogspot.com/
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Peake



Joined: Jun 29, 2007
Posts: 1109
Location: Loss Angeles
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PostPosted: Wed Jun 29, 2011 3:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Danger! Don't etch this! Am having slight size alterations occur when going from photoshop to pdf, and ICs won't fit correctly. Huge apologies to anyone who might have done so; from now on I'll etch and confirm everything prior to posting. Embarassed

Needing ideas please...

I'm working on revising Mark Verbos' 291 filter dual layout because it's sized for Buchla systems (4" x nearly 6"). I like the idea of a single board, or even stacking two boards for a quad setup on a single width panel.

I've built and enjoyed the Stites/Luka/etc. modified versions of Mark's board, with the buffers for LP and HP, and had wanted that and a mixer either per filter or available in a quad concept for summing, or for merely adding LP and BP for variable notch response in any single filter, then summing, etc.

So, I've added Luka's adaptation of Ken Stone's DC mixer, as well as individual buffers for this particular board size, then went a little nuts and changed the mixer in the first filter to a slightly modified MXR distortion +. It would be nice to have something like a RAT per filter, but that's a 308 opamp, and I've just used the sections of a TL084 instead.

Now, the Distortion + uses a 741 with a 9V battery, and 4.5V into a 1M to the input. The 084 is of course using 15V bipolar rails and has several times the slew rate of the 741, meaning a crisper sound (not necessarily desirable here). I'm asking what proportion is required for the 4.5V section, with the main voltage nearly twice that of the original design. Just double it to 9V and it should be well? I wanted to ask before etching, although I'll likely just have to etch and tweak anyhoo.

Also, I have one unused opamp section in the one filter and wanted to see if anyone had any sweet ideas for it (HF boost/cut, etc.) in the available space. I can see how to further tighten the distortion layout to allow a little more room for that open opamp. "What would you do?"

Very Happy

Thanks to all who have brought this design to this point!! I haven't added a wiring diagram as the core is still unproven. Here is the Distortion +:

http://www.premierguitar.com/Magazine/Issue/2008/Dec/MXR_Distortion_Plus_Mods.aspx


291 Dual 2.pdf
 Description:

Download
 Filename:  291 Dual 2.pdf
 Filesize:  4.79 MB
 Downloaded:  251 Time(s)


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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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numbernone



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

PostPosted: Tue Aug 09, 2011 6:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

Assembled the third from my original 3 boards of 2007, has it really been so long?? WOW

So this one is again different from the other 2. Probably the most straitforward sounding of them the 3. HOWEVER this guy just wont go to the bottom like the other 2. I tend to the HP output and love to sweep the bass frequencies away and have them come rushing back with a WHOOMP. This one just. almost makes it but not quite. Mind you it will pass low frequencies, it just doenst not emphasize them like the other 2 will. Not really sure where to proceed to try and get some additional bottom.
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xi-boy



Joined: Dec 16, 2008
Posts: 18
Location: germany

PostPosted: Mon Aug 22, 2011 5:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Luka wrote:
here you go
v4

fixed the mixer section - didn't change anything else

it would be nice to completely redesign this pcb so it doesn't have all the wire links. i tried to maintain mark's filter section and it made it hard to add lots of extra circuitry without wasting space.


hi

i am a little bit confused about the potiometer values of the current version

its still
r47 100k lin
r7 resonance 5k
r47 fm level 50k lin
r37 initial cent freq 10k lin
r40 center freq 10k lin
r41 initial bandw 10k lin
r44 band mod level 10k lin
?

thanks a lot
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thermionicjunky



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

PostPosted: Tue Aug 23, 2011 8:11 am    Post subject: Reply with quote  Mark this post and the followings unread

xi-boy wrote:

hi

i am a little bit confused about the potiometer values of the current version

its still
r47 100k lin
r7 resonance 5k
r47 fm level 50k lin
r37 initial cent freq 10k lin
r40 center freq 10k lin
r41 initial bandw 10k lin
r44 band mod level 10k lin
?

thanks a lot


Those values work for me.
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xi-boy



Joined: Dec 16, 2008
Posts: 18
Location: germany

PostPosted: Tue Aug 23, 2011 10:41 am    Post subject: Reply with quote  Mark this post and the followings unread

great. thanks
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L´Andratté



Joined: Sep 23, 2012
Posts: 60
Location: Hamburg, Germany
Audio files: 5

PostPosted: Sun Mar 02, 2014 6:25 am    Post subject: Reply with quote  Mark this post and the followings unread

I have just breadboarded the circuit from the Scott Stites schematic and am positivly blown away by the beautiful sounds of it, I´m totally in resonance! cyclops

Now being a analog freak, I have to understand how it works, but altough I thought I had knowledge of the vc filter topologys, I´m kind of clueless with this one, it looks a bit like a heavily modified state variable...

Please is there anyone willing to Idea me?
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Snaper



Joined: Feb 28, 2014
Posts: 68
Location: Hungary

PostPosted: Thu Oct 09, 2014 3:33 am    Post subject: Reply with quote  Mark this post and the followings unread

Luka wrote:
here you go
v4

fixed the mixer section - didn't change anything else

it would be nice to completely redesign this pcb so it doesn't have all the wire links. i tried to maintain mark's filter section and it made it hard to add lots of extra circuitry without wasting space.

Have somebody wiring diagram for this one?
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