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 Forum index » DIY Hardware and Software
Buchla VCO
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J3RK



Joined: Jun 05, 2006
Posts: 99
Location: Seattle

PostPosted: Tue Mar 08, 2011 11:05 am    Post subject: Reply with quote  Mark this post and the followings unread

I admire board etchery. That was purely a diagnostic comment/question. I very nearly bought all the items to do it, but I currently have a time-deficit, so I just get small proto-batches done of things usually.
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L-1



Joined: Dec 11, 2010
Posts: 39
Location: Belarus
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PostPosted: Mon Mar 21, 2011 10:52 am    Post subject: square-saw switch Reply with quote  Mark this post and the followings unread

I think to install SP3T switch for square-saw selecting. Correct me if I draw wrong.


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beautyofdecay_



Joined: Aug 14, 2009
Posts: 38
Location: Netherlands

PostPosted: Mon Mar 21, 2011 12:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

That looks OK to me.

Good idea BTW!

.

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L-1



Joined: Dec 11, 2010
Posts: 39
Location: Belarus
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PostPosted: Mon Mar 21, 2011 1:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

It pleases. Will try.
I'm going to build a block of six VCO's with common 10-turn frequency pot and a mixer.
I think to draw own layout and use BC857BS/BC847BS transistors pairs similar to Bergfotron VCO's. It will much cheaper.
Will post the results...
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Peake



Joined: Jun 29, 2007
Posts: 1109
Location: Loss Angeles
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PostPosted: Tue May 24, 2011 1:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

I have had a clone designed of the 258B (not the "C") and can confirm that L-1's 3PDT switch concept works just fine. Thank you! You posted it at the perfect time for my project. A very, very clever observation! I've stared at the 258 schemos for years and never noticed that.

Note that my "clone" is not approved by Don Buchla for public release. He just didn't want anyone to use original artwork, so I had someone CAD up the old schemo plus a few new bits. Not, unfortunately 1V/Octave, but I'm considering it. Could just get a few Plan B Model 15s...

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"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
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L-1



Joined: Dec 11, 2010
Posts: 39
Location: Belarus
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PostPosted: Wed May 25, 2011 3:24 am    Post subject: Reply with quote  Mark this post and the followings unread

i'm very glad that switch work. Thank you Peake for good news. I have made six boards as described above but still wait for 49K9 resistors from shop and not tested yet.


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Peake



Joined: Jun 29, 2007
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PostPosted: Wed May 25, 2011 12:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow...Outstanding. I look forward to hearing your finished boards!

I have hundreds of 49K9 resistors if you want me to mail you some (from America, could take a while). I bought a huge batch of them because they are so weird and show up in Buchla designs...

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"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
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L-1



Joined: Dec 11, 2010
Posts: 39
Location: Belarus
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PostPosted: Wed May 25, 2011 5:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you Peake but I wait for my parcel this week with 49K9 and other parts for my builds. Very Happy thanks
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L-1



Joined: Dec 11, 2010
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PostPosted: Sat Jun 11, 2011 7:38 am    Post subject: Reply with quote  Mark this post and the followings unread

I have finished 3 oscillators. Everything works as excepted. I post docs and photos. Maybe it will be interesting to someone.


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3 of 6 are ready
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L-1



Joined: Dec 11, 2010
Posts: 39
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PostPosted: Sat Jun 11, 2011 7:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Waveforms, v/octaves and finally pcb design.


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waveforms from saw to sine
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waveforms from square to sine
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v/octaves are perfect for 5 octaves
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L-1 258.pdf
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L-1



Joined: Dec 11, 2010
Posts: 39
Location: Belarus
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PostPosted: Sat Jun 11, 2011 9:15 am    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.
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.
This is scope shots from original vintage Buchla258C.
http://buchlatech.blogspot.com/2009/01/funny-waveshapes.html
This is Mark Verbos shots.
Mine are very similar.
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ericcoleridge



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

PostPosted: Sat Jun 11, 2011 10:17 am    Post subject: Reply with quote  Mark this post and the followings unread

L-1 wrote:
Waveforms, v/octaves and finally pcb design.


This is truly inspiring work L-1, thanks for posting all of this info. Will you post the PCB etch layout also (without the parts overlay)?
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L-1



Joined: Dec 11, 2010
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PostPosted: Sat Jun 11, 2011 10:41 am    Post subject: Reply with quote  Mark this post and the followings unread

PDF file contains 3 pages, second is etch layout, third is etch layout for transistor pairs 'IC'.
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Sebo



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Sun Jun 12, 2011 9:24 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi:
I etched the Mark Verbos layout, but never build it, I want to see what differences have with your layout, but I can't open the PDF (the archive is damaged error).
Thank you.

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L-1



Joined: Dec 11, 2010
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PostPosted: Mon Jun 13, 2011 3:26 am    Post subject: Reply with quote  Mark this post and the followings unread

I optimized file for 5 version of Acrobat. My layout is for BC857BS / BC847BS transistor pairs.


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LFLab



Joined: Dec 17, 2009
Posts: 191
Location: Rosmalen, Netherlands

PostPosted: Mon Jun 13, 2011 6:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Like the idea of the daughterboard solution for the double transistors, but those BC847/857BS aren't exactly abundant, where did you buy them?
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Sebo



Joined: Apr 27, 2007
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PostPosted: Mon Jun 13, 2011 8:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Now I can open the PDF, thank you very much!!!
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L-1



Joined: Dec 11, 2010
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PostPosted: Mon Jun 13, 2011 9:12 am    Post subject: Reply with quote  Mark this post and the followings unread

I have ordered at Farnell. They are much cheaper then DIP case pairs (SSM2220 etc.) and work very good.
BC847BS
http://ru.farnell.com/nxp/bc847bs/transistor-dual-npn-sc-88/dp/1081234RL
BC857BS
http://ru.farnell.com/nxp/bc857bs/transistor-dual-pnp-sc-88/dp/1081247
2K temco
http://ru.farnell.com/jsp/search/productdetail.jsp?SKU=1174312
1k tempco
http://ru.farnell.com/jsp/search/productdetail.jsp?SKU=1174311
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L-1



Joined: Dec 11, 2010
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PostPosted: Tue Jun 14, 2011 8:49 am    Post subject: SOUNDS Reply with quote  Mark this post and the followings unread

Device is ready. Here is some photos and sound, it is dry oscillators without effects, eq and compression. 1,2,3 osc left, 4,5,6 right channels, I play some notes from keyboard, saw wave, first 2 osc then 4 then 6 together.


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Peake



Joined: Jun 29, 2007
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PostPosted: Wed Jun 15, 2011 10:54 am    Post subject: Reply with quote  Mark this post and the followings unread

WOW Very Happy

Beautiful build, beautiful panel, can't wait to hear more mp3s!

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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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L-1



Joined: Dec 11, 2010
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PostPosted: Wed Jun 15, 2011 12:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

Of course!
This is six osc's through two lopass gates, little bit eq and compression. NO EFFECTS, any delays and reverb. I just play some notes from keyboard.


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LFLab



Joined: Dec 17, 2009
Posts: 191
Location: Rosmalen, Netherlands

PostPosted: Wed Jun 15, 2011 1:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Looks and sounds great L-1! Superb idea with the BC double bjt's as well, saves a bundle!
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shawn



Joined: Dec 13, 2005
Posts: 209
Location: savannah

PostPosted: Thu Jun 16, 2011 8:58 am    Post subject: Reply with quote  Mark this post and the followings unread

Great work!!!
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Snaper



Joined: Feb 28, 2014
Posts: 65
Location: Hungary

PostPosted: Tue Aug 12, 2014 12:05 am    Post subject: Reply with quote  Mark this post and the followings unread

L-1 wrote:
I have ordered at Farnell. They are much cheaper then DIP case pairs (SSM2220 etc.) and work very good.
BC847BS
http://ru.farnell.com/nxp/bc847bs/transistor-dual-npn-sc-88/dp/1081234RL
BC857BS
http://ru.farnell.com/nxp/bc857bs/transistor-dual-pnp-sc-88/dp/1081247
2K temco
http://ru.farnell.com/jsp/search/productdetail.jsp?SKU=1174312
1k tempco
http://ru.farnell.com/jsp/search/productdetail.jsp?SKU=1174311

I'm not familiar (unfortanetly) with SMD, is there any replacement for this?
(DIP array or matche pairs?)
Thanks in advance!
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vladosh



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PostPosted: Thu Aug 14, 2014 2:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Snaper you can use SSM2220 in the v/oct expo converter and use matched 2N3904 for the other as it's in the original Mark Verbos pdf somewhere on this thread if it isn't removed just gotta watch for the pinout ,thanks L1 for sharing the layout ,it is a great VCO ,i wonder what is the best choice for initial freq pot ,my 258 sounds great to me but the init freq pot can act bit weird when moving from zero ,and soldering those SMD isn't much of big deal ,they are really tiny , but it is actually easy once you try few times
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