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J3RK
Joined: Jun 05, 2006 Posts: 123 Location: Seattle
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Posted: Tue Mar 08, 2011 11:05 am Post subject:
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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
Audio files: 4
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beautyofdecay_
Joined: Aug 14, 2009 Posts: 38 Location: Netherlands
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Posted: Mon Mar 21, 2011 12:22 pm Post subject:
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That looks OK to me.
Good idea BTW!
. _________________ www.ecalpemos.nl |
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L-1
Joined: Dec 11, 2010 Posts: 39 Location: Belarus
Audio files: 4
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Posted: Mon Mar 21, 2011 1:47 pm Post subject:
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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: 1113 Location: Loss Angeles
Audio files: 3
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Posted: Tue May 24, 2011 1:59 pm Post subject:
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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... _________________ 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 Posts: 39 Location: Belarus
Audio files: 4
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Peake
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
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Posted: Wed May 25, 2011 12:21 pm Post subject:
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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... _________________ 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 Posts: 39 Location: Belarus
Audio files: 4
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Posted: Wed May 25, 2011 5:11 pm Post subject:
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Thank you Peake but I wait for my parcel this week with 49K9 and other parts for my builds. |
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L-1
Joined: Dec 11, 2010 Posts: 39 Location: Belarus
Audio files: 4
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Posted: Sat Jun 11, 2011 7:38 am Post subject:
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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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L-1
Joined: Dec 11, 2010 Posts: 39 Location: Belarus
Audio files: 4
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Posted: Sat Jun 11, 2011 7:44 am Post subject:
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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
Audio files: 4
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ericcoleridge
Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Sat Jun 11, 2011 10:17 am Post subject:
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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 Posts: 39 Location: Belarus
Audio files: 4
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Posted: Sat Jun 11, 2011 10:41 am Post subject:
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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: 564 Location: Argentina
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Posted: Sun Jun 12, 2011 9:24 am Post subject:
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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. _________________ Sebo
---------------------------------------
My Music:
https://www.facebook.com/cosaquitos/ |
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L-1
Joined: Dec 11, 2010 Posts: 39 Location: Belarus
Audio files: 4
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LFLab
Joined: Dec 17, 2009 Posts: 497 Location: Rosmalen, Netherlands
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Posted: Mon Jun 13, 2011 6:14 am Post subject:
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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 Posts: 564 Location: Argentina
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Posted: Mon Jun 13, 2011 8:46 am Post subject:
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Now I can open the PDF, thank you very much!!! _________________ Sebo
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My Music:
https://www.facebook.com/cosaquitos/ |
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L-1
Joined: Dec 11, 2010 Posts: 39 Location: Belarus
Audio files: 4
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L-1
Joined: Dec 11, 2010 Posts: 39 Location: Belarus
Audio files: 4
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Posted: Tue Jun 14, 2011 8:49 am Post subject:
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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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258 osc test.mp3 |
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Peake
Joined: Jun 29, 2007 Posts: 1113 Location: Loss Angeles
Audio files: 3
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Posted: Wed Jun 15, 2011 10:54 am Post subject:
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WOW
Beautiful build, beautiful panel, can't wait to hear more mp3s! _________________ 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 Posts: 39 Location: Belarus
Audio files: 4
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LFLab
Joined: Dec 17, 2009 Posts: 497 Location: Rosmalen, Netherlands
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Posted: Wed Jun 15, 2011 1:04 pm Post subject:
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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
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Posted: Thu Jun 16, 2011 8:58 am Post subject:
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Great work!!! |
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Snaper
Joined: Feb 28, 2014 Posts: 217 Location: Hungary
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Posted: Tue Aug 12, 2014 12:05 am Post subject:
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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
Joined: Aug 02, 2010 Posts: 659 Location: macedonia
Audio files: 46
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Posted: Thu Aug 14, 2014 2:55 am Post subject:
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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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