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 Forum index » DIY Hardware and Software
Buchla 218 VC-able Portamento - Works!
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probablyjoel



Joined: Aug 31, 2008
Posts: 11
Location: Seattle

PostPosted: Sun Dec 07, 2008 3:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks so much! This will really help, and I'm really excited to try it out!
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probablyjoel



Joined: Aug 31, 2008
Posts: 11
Location: Seattle

PostPosted: Sun Dec 07, 2008 3:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

I am assuming that the manual control is the power source to the V+... is that right?
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funkyfarm



Joined: Jan 21, 2007
Posts: 583
Location: France
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PostPosted: Tue Dec 30, 2008 2:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Shall we use 1N5224 2.8V Zener diode or 1N5233 6V, as stated in schematic ?

Thank you.
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neandrewthal



Joined: May 11, 2007
Posts: 672
Location: Canada

PostPosted: Tue Dec 30, 2008 10:31 am    Post subject: Reply with quote  Mark this post and the followings unread

I used 6v and it works fine.
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vtl5c3



Joined: Sep 08, 2006
Posts: 425
Location: PDX
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PostPosted: Tue Dec 30, 2008 11:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Use the 6V zener. I need to update my parts layout. Sorry for the confusion.
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funkyfarm



Joined: Jan 21, 2007
Posts: 583
Location: France
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PostPosted: Fri Feb 20, 2009 4:24 pm    Post subject: Re: Buchla 218 VC-able Portamento - Works! Reply with quote  Mark this post and the followings unread

vtl5c3 wrote:
I may have to do a bit of fine tuning... if nothing else I will try smaller cap values, since it's pretty easy to get way too much portamento going.


Can you get on/off effect with 5V steps from a sequencer ?
Buchla CV are 0-15V ?

Cheers,

ff
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funkyfarm



Joined: Jan 21, 2007
Posts: 583
Location: France
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PostPosted: Mon Mar 02, 2009 2:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

You can get on/off effect with 12V steps from an CGS step sequencer !
Slew pot fully ccw.

I've added a pot on cv input, and put 33kR in parallel with 68k input resistor to have a cool range curve.
But I have to invert the incoming cv signal because positive voltages reduce slew fx...

I've measured 0,002v offset at the worst potentiometer position !
I use it on v/o

Two midi transposed klee voices ; you can hear 218 slew on the higher one. oakley vco + hot input 291 and a lot of 292.
3 minutes, and maybe not the better sample as an illustration, but,
That rocks !

http://sslstudiodesign.free.fr/218/
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LektroiD



Joined: Aug 23, 2008
Posts: 1017
Location: Scottish Borders
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PostPosted: Fri Sep 17, 2010 11:38 am    Post subject: Reply with quote  Mark this post and the followings unread

Is there anything I can replace the 1N5233 with?
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neandrewthal



Joined: May 11, 2007
Posts: 672
Location: Canada

PostPosted: Thu Sep 23, 2010 10:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

I`m sure any 6V zener (or close enough) would work.
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RSFC



Joined: Sep 02, 2010
Posts: 63
Location: space lab

PostPosted: Fri Feb 25, 2011 3:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

Curious if these could be used to make a DIY pseudo buchla 255?
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ericcoleridge



Joined: Jan 16, 2007
Posts: 889
Location: NYC

PostPosted: Fri Feb 25, 2011 4:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

no, I'm sorry, that would break every DIY rule in the book. you can't use this vclag and an attentuverter to mimick the functionality of a 255.
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RSFC



Joined: Sep 02, 2010
Posts: 63
Location: space lab

PostPosted: Fri Feb 25, 2011 5:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

hahaha, no I wasn't asking for permission. I was just curious if my thoughts were correct, which it sounds like they are. Sometimes buchla descriptions of their own modules are cryptic. I wanted to make sure I was thinking about it in the right way.
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bubzy



Joined: Oct 27, 2010
Posts: 593
Location: United Kingdom
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PostPosted: Sat Feb 26, 2011 10:39 am    Post subject: Reply with quote  Mark this post and the followings unread

ericcoleridge wrote:
no, I'm sorry, that would break every DIY rule in the book. you can't use this vclag and an attentuverter to mimick the functionality of a 255.


what book?

surely theres no problem if the schematics are freely available.

incidentally i have used a 6.2v zener and it works ok.
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roman_f



Joined: Jul 03, 2007
Posts: 63
Location: Moscow
Audio files: 1

PostPosted: Wed Mar 21, 2012 5:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

i have it working but the only issue is that the working range of the pot is maybe 7-10. before 7 - nothing happens, then it starts slewing

did anyone experience that? should i put the negative rail instead of a 0 on the CCW lug?
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