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funkyfarm
Joined: Jan 21, 2007 Posts: 583 Location: France
Audio files: 3
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Posted: Tue Feb 27, 2007 10:58 am Post subject:
Buchla VCO Subject description: Mark Verbos/ Buchla 258 style oscillator |
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Did anyone try Mark Verbo's adaptation ?
Can anyboby explains to me why there is no vactrol in the oscillator core circuit ?
http://www.simple-answer.com/DIY.html |
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toppobrillo
Joined: Dec 10, 2005 Posts: 766 Location: oakland, ca
G2 patch files: 1
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Posted: Tue Feb 27, 2007 11:40 am Post subject:
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heya-
haven't made it like Verbos', but i did build a version with a discreet OTA and NPN expo built with a transistor array IC. It works pretty well.
Quote: | Can anyboby explains to me why there is no vactrol in the oscillator core circuit ? |
I wouldn't use one anywhere in the core circuit. The only place you'd use it, maybe, is for cross-fading between waveshapes. The original circuit uses a FET. I had decent luck with the MPF-102 here. |
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andrewF
Joined: Dec 29, 2006 Posts: 1176 Location: australia
Audio files: 4
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Posted: Tue Feb 27, 2007 4:25 pm Post subject:
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I built mark's version.
at the time, it was the biggest p'n'p board i had tried and it took 3 goes before i got a working VCO. I still have the 2 stillborn PCBs in a box somewhere.
My plan had been to build two, a square and a saw version, as you can see on the panel. but, in the end there was just one.
That being said, this VCO is well worth having. its character is very different from anything else i have tried
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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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Posted: Tue Feb 27, 2007 4:42 pm Post subject:
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Beautiful front panel _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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andrewF
Joined: Dec 29, 2006 Posts: 1176 Location: australia
Audio files: 4
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Posted: Tue Feb 27, 2007 8:29 pm Post subject:
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v-un-v wrote: | Beautiful front panel |
Thanks -but it was a shame i made the panel before the circuits, all the 258 Saw sockets are unconnected.....sigh! finish it one day... |
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mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
Audio files: 212
G2 patch files: 60
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Posted: Tue Feb 27, 2007 8:49 pm Post subject:
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You did the right thing. Buchla always designed the front panel before the circuits. _________________ --Howard
my music and other stuff |
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mono-poly
Joined: Jul 07, 2004 Posts: 937 Location: Rotterdam, Netherlands
Audio files: 2
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Posted: Wed Feb 28, 2007 5:04 am Post subject:
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I heard this vco isn't that good.
His vcf is a nice and good one! |
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v-un-v
Janitor
Joined: May 16, 2005 Posts: 8933 Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1
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Posted: Wed Feb 28, 2007 6:32 am Post subject:
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mosc wrote: | You did the right thing. Buchla always designed the front panel before the circuits. |
A very wise move imo. _________________ ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN. |
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toppobrillo
Joined: Dec 10, 2005 Posts: 766 Location: oakland, ca
G2 patch files: 1
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Posted: Wed Feb 28, 2007 4:12 pm Post subject:
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Quote: | I heard this vco isn't that good.
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you mean the Verbos version? in what terms? |
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mono-poly
Joined: Jul 07, 2004 Posts: 937 Location: Rotterdam, Netherlands
Audio files: 2
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Posted: Thu Mar 01, 2007 8:57 am Post subject:
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In terms that it doesn't sound as good as the orgional.
But his vcf is damn good! |
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toppobrillo
Joined: Dec 10, 2005 Posts: 766 Location: oakland, ca
G2 patch files: 1
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Posted: Thu Mar 01, 2007 11:40 am Post subject:
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Quote: | In terms that it doesn't sound as good as the orgional. |
it's basically the same.. the only difference is the use of an integrated OTA [as opposed to the discreet of the original, used here as a current-controlled current source] and an op-amp integrator. everything that contributes to what becomes audible sound is the same, including the sine shaper, which works well enough, in my opinion. |
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23isgood
Joined: Nov 18, 2006 Posts: 236 Location: San Francisco, CA bay area
Audio files: 13
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Posted: Fri Mar 02, 2007 12:29 am Post subject:
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I agree really nice looking panel. How did you do it? |
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andrewF
Joined: Dec 29, 2006 Posts: 1176 Location: australia
Audio files: 4
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Posted: Fri Mar 02, 2007 5:41 am Post subject:
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this description is on my homepage -
'The panels were cut from a sheet of aluminium and hand-drilled. i created the panel templates in Front Panel Designer, printed them out and used the prints as a drilling guide. The labels are a printable clear 'contact film' (some with inbuilt glitter). To get the image and labelling on i ran them thru the printer twice, 1st for the image, 2nd for the labelling. Then stuck the contact film to the panels and covered them with an 'industrial strength' (read - thick) contact as protection."
more pix of similar panels here too
http://www.sdiy.org/pinky/box/
I have only seen the printable clear 'contact film' on sale in Japan, needs a laser printer too. It isn't so strong on its own hence the extra layer of thick contact.
These days i use the same technique but just use photo quality paper, stick it to the panel with double sided tape and contact film over the top.
All the panel hardware helps keep it in place too.
my minisyn has such panels-
http://www.sdiy.org/pinky/MINISYN.html
its quick, cheap and cheerful but good enough for me. |
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mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
Audio files: 212
G2 patch files: 60
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Posted: Fri Mar 02, 2007 8:05 am Post subject:
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Tell us about that mannequin...
_________________ --Howard
my music and other stuff |
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andrewF
Joined: Dec 29, 2006 Posts: 1176 Location: australia
Audio files: 4
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Posted: Fri Mar 02, 2007 11:04 pm Post subject:
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meet pinky -
http://www.sdiy.org/pinky/pinky.html
"pinky has mostly CGS boards - gate sequencer, with preset and cv add-ons, analog shift register, digital wavetable with numitron display, Harry's morph lag, digital noise, 2 vcas, steiner vcf, 2 bandpass filters, passive ring modulator, envelope generator, joystick-nipple, super psycho lfo, psycho lfo and dc mixer. Also Paia dual VCOs and modulator" |
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mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
Audio files: 212
G2 patch files: 60
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Sat Mar 03, 2007 7:11 am Post subject:
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andrewF wrote: | meet pinky |
Right
Pinky seems to have good set of controls to tweak
(and sounds good as well) _________________ Jan
also .. could someone please turn down the thermostat a bit.
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funkyfarm
Joined: Jan 21, 2007 Posts: 583 Location: France
Audio files: 3
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Posted: Sat Mar 03, 2007 7:48 am Post subject:
Re: Buchla VCO Subject description: Mark Verbos/ Buchla 258 style oscillator |
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Quote: | Can anyboby explains to me why there is no vactrol in the oscillator core circuit ?
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Vactrol ain't no accurate device ?
a VCO circuit design can't be designed around a single resistive element (for control) ?
expo response ?
Cheers |
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Jerry L
Joined: Dec 13, 2006 Posts: 34 Location: u.s.a.
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Posted: Thu Mar 08, 2007 11:19 am Post subject:
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Hi
Maybe I am confused, but isn't the matched pair(ssm2220)
in the wrong way round in Mark's layout?
By that I mean are not the collectors and emitters
reversed? Has anybody used this layout?
Jeri |
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andrewF
Joined: Dec 29, 2006 Posts: 1176 Location: australia
Audio files: 4
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Posted: Fri Mar 09, 2007 12:29 am Post subject:
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yes he does, luckily I used a 2SA798 dual pnp.
I had some other issue with this board, can't remember exactly...
note- the component placement picture is viewed from the bottom. |
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Jerry L
Joined: Dec 13, 2006 Posts: 34 Location: u.s.a.
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Posted: Fri Mar 09, 2007 6:42 am Post subject:
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Hi
Thanks!!!!!
The from the bottom component view sort
of put me off also. I have not found any other
obvious errors.
I was thinking of building one of these,
Any input would be appreciated.
Jeri |
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tourist
Joined: Mar 15, 2007 Posts: 2 Location: france
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Posted: Thu Mar 15, 2007 3:48 pm Post subject:
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Hi everybody!!
I'm new on this site. looks great!
I finished recently one of M. Verbos adaptation of Buchla 258 (saw version).
Makes sounds but doesn't sound like i expected.
How does the waveshape control act? I think it must move from saw to sine.
Mine produces saw waves and i can distort it with waveshape control to produce something else (not sine). Of course, i tried many combinaition of trims but nothing like a sine.
Could anybody give me some audio samples of this VCO (for exemple A440Hz with waveshape control moving slowly from sine to saw/square)?
Thanks!!
Please don't pay attention on mistakes, I'm french and it's hard for me to write... |
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toppobrillo
Joined: Dec 10, 2005 Posts: 766 Location: oakland, ca
G2 patch files: 1
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mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
Audio files: 212
G2 patch files: 60
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Posted: Thu Mar 15, 2007 6:44 pm Post subject:
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Topp, that is a GREAT link to old Buchla pics and schematics.
_________________ --Howard
my music and other stuff |
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tourist
Joined: Mar 15, 2007 Posts: 2 Location: france
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Posted: Fri Mar 16, 2007 12:04 am Post subject:
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Thanks a lot Topp...
I didn't use the pcb of M. Verbos. I did it by soldering components together.
So I made 2 or 3 errors during the manufacturing period. I must have burnt some key components of the sine shaping.
Now, I know how it is suppose to work!! |
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