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 Forum index » DIY Hardware and Software
Buchla 208 Random PCB
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funkyfarm



Joined: Jan 21, 2007
Posts: 583
Location: France
Audio files: 3

PostPosted: Mon Dec 22, 2008 1:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

sorry, i meant, assuming this 208 pseudo random thing to be driven by a VC-CLOCK (-10v into any vco), if you use the same signal (1V/oct, velocity...) for controlling both clock rate and Portamento/ 218 slew cv input, you have correlation between speed and slew.

sounds are sharper as rythm increases.
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funkyfarm



Joined: Jan 21, 2007
Posts: 583
Location: France
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PostPosted: Fri Mar 13, 2009 5:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's what i mean (the fx is a little excessive) :

208 218 lfo saw control sample on http://sslstudiodesign.free.fr/218/

A descending ramp (saw lfo) controls both clock rate (wogglebug NE555) and CV IN on 218 slew.
First 208 output is processed trough this latter.

There is four sequences, i've cut control for 218 on the last. (ie all notes are fully slewed even at high clock rate)

I'm sure you could get cool patches with one or two (oncoming) Dunsel circuits here...
------------------------------------------------------------------------
208 outputs have a big big range ; it can be too much if you processed them via reversible attenuator (half curse) or use them for VCO.
I've put two voltage dividers (for 5V or so) on the two first outputs.
The two last are used for buchla (292 cv in, vactrol panner/xfader...)

Thank you for these pcb vtl5c3 Smile
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vtl5c3



Joined: Sep 08, 2006
Posts: 423
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PostPosted: Sat Mar 14, 2009 7:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi FUnky,

What is the Dunsel circuit?

Vtl.5c3
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Photon



Joined: Mar 22, 2005
Posts: 363
Location: Boston
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PostPosted: Sun Mar 15, 2009 9:15 am    Post subject: Reply with quote  Mark this post and the followings unread

TLN-861 Dunsel:
http://www.tellun.com/motm/diy/tln861/TLN-861.html
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funkyfarm



Joined: Jan 21, 2007
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PostPosted: Sun Mar 15, 2009 10:10 am    Post subject: Reply with quote  Mark this post and the followings unread

you can get the positive part of any signal on a socket, and the negative part on another separate output socket Smile (with no 0,7v drop...)
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Funky40



Joined: Sep 24, 2005
Posts: 875
Location: Swiss
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PostPosted: Sun Mar 15, 2009 12:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Photon wrote:
TLN-861 Dunsel:
http://www.tellun.com/motm/diy/tln861/TLN-861.html


wow, i wish to have such a board,
what's missed is -A +5V,
has anybody n advice how to do this
ahh ok, i think i just have to come with +A instead of -A for the offset block, right ? ( see A+5 schematic top right )
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funkyfarm



Joined: Jan 21, 2007
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Location: France
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PostPosted: Sun Mar 15, 2009 1:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

Smile

yes !

A-5 = - (-A+5) = -(-A)-5
A+5 = - (-A-5) = -(-A)+5
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Scott Stites
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Joined: Dec 23, 2005
Posts: 4121
Location: Mount Hope, KS USA
Audio files: 96

PostPosted: Sun Mar 15, 2009 9:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
you can get the positive part of any signal on a socket, and the negative part on another separate output socket (with no 0,7v drop...)


What you've just described is an ideal diode circuit. This is an exceedingly useful device for synth circuit design. If anyone hasn't already, be sure to check out Jim Patchell's write-up on it here:

http://www.uni-bonn.de/~uzs159/diode_tutorial/index.html

I used it to derive the output permutations in the original design of the Appendage. Lately, I've used it as a building block in a design I've been absorbed in.

This is a scope shot of a few outputs of the project. The top triangle wave is one octave below the fundamental - it was derived by means other than an ideal diode. The bottom triangle wave, however, was obtained through the use of ideal diode circuits - it's two octaves above the fundamental. Both waveforms are simultaneous from the same VCO.

Cheerios,
Scott


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Tasmanian Alkaloid



Joined: Jun 29, 2008
Posts: 116
Location: Isle De Mort

PostPosted: Sun Mar 15, 2009 10:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Romeo,
i'm planning to build 2 of these, but as i wrote up a parts list, i was unsure what 'FB' stands for (on the parts layout pdf).
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numbertalk



Joined: May 05, 2008
Posts: 980
Location: Austin, TX
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PostPosted: Mon Mar 16, 2009 6:25 am    Post subject: Reply with quote  Mark this post and the followings unread

Tasmanian Alkaloid wrote:
Hi Romeo,
i'm planning to build 2 of these, but as i wrote up a parts list, i was unsure what 'FB' stands for (on the parts layout pdf).


Ferrite Bead?
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vtl5c3



Joined: Sep 08, 2006
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PostPosted: Mon Mar 16, 2009 8:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Yep. Ferrite Bead.

numbertalk wrote:
Tasmanian Alkaloid wrote:
Hi Romeo,
i'm planning to build 2 of these, but as i wrote up a parts list, i was unsure what 'FB' stands for (on the parts layout pdf).


Ferrite Bead?
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Tasmanian Alkaloid



Joined: Jun 29, 2008
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PostPosted: Mon Mar 16, 2009 7:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks guys!
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funkyfarm



Joined: Jan 21, 2007
Posts: 583
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PostPosted: Wed Mar 18, 2009 4:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Scott Stites wrote:
Quote:
you can get the positive part of any signal on a socket, and the negative part on another separate output socket (with no 0,7v drop...)


What you've just described is an ideal diode circuit. This is an exceedingly useful device for synth circuit design. If anyone hasn't already, be sure to check out Jim Patchell's write-up on it here:

http://www.uni-bonn.de/~uzs159/diode_tutorial/index.html


That's it ! IDEAL diode with no voltage drop.

I've build Patchell's too, with a -VBreak pot ; but i can remember outputs need to be buffered for multiple use.
Or maybe my two LED drivers need to be buffered...

The Dunsel module also have a FWR from these two outputs !?
Don't think about its use already...

Very Happy
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LetterBeacon



Joined: Mar 18, 2008
Posts: 454
Location: London, UK

PostPosted: Tue Jun 30, 2009 7:34 am    Post subject: Reply with quote  Mark this post and the followings unread

What type of capacitors would be appropriate for this circuit? I was planning on just using ceramics throughout as I have a lot of 0.1uF ceramics lying around. That should be fine, shouldn't it?
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vtl5c3



Joined: Sep 08, 2006
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PostPosted: Tue Jun 30, 2009 8:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Yep, ceramics should be fine. They're mostly there for supply decoupling, which ceramics do pretty well. The board has spots for 10uF caps at the supply inputs, but you can probably leave those out.

Romeo

LetterBeacon wrote:
What type of capacitors would be appropriate for this circuit? I was planning on just using ceramics throughout as I have a lot of 0.1uF ceramics lying around. That should be fine, shouldn't it?
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LetterBeacon



Joined: Mar 18, 2008
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PostPosted: Tue Jun 30, 2009 8:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Great, thanks a lot!
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Photon



Joined: Mar 22, 2005
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PostPosted: Sat Aug 08, 2009 6:35 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.

Finished this recently. The most fun per rack unit in my whole system. thanks Romeo, Scott, and of course Mr. B.
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vtl5c3



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PostPosted: Sat Aug 08, 2009 9:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the photo. Makes me feel warm and fuzzy on the inside seeing that!
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pcp2020



Joined: Dec 25, 2007
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PostPosted: Sun Aug 09, 2009 2:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

I noticed that Scotts schematic wants 15 volts. would this work on 12?
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Photon



Joined: Mar 22, 2005
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PostPosted: Sun Aug 09, 2009 5:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's a quick sample. Nothing fancy. The module is feeding 3 VCO's. Its being clocked by an LFO, the frequency of which is being occasionally goosed by an EG triggered by the Blacet Event Generator.

p.


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davemoog



Joined: Feb 23, 2008
Posts: 52
Location: Vancouver

PostPosted: Tue Nov 03, 2009 11:13 pm    Post subject: 4015 locking up? Reply with quote  Mark this post and the followings unread

Has anyone had problems with the 4015 locking up and then no random CVs are produced? Powering off then on again will restart.

Thanks Dave
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fluxmonkey



Joined: Jun 24, 2005
Posts: 696
Location: cleve

PostPosted: Tue Nov 17, 2009 11:22 am    Post subject: Reply with quote  Mark this post and the followings unread

i have a couple extra boards coming from ExpressPCB... if anyone would like them at cost + postage please drop me a PM with your email address.

thx
bbob

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jooks



Joined: Mar 18, 2009
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Location: sweden

PostPosted: Tue Nov 17, 2009 2:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
have a couple extra boards coming from ExpressPCB... if anyone would like them at cost + postage please drop me a PM with your email address.

PM sent.
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valis



Joined: Sep 16, 2008
Posts: 121
Location: Oregon, USA
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PostPosted: Thu Nov 19, 2009 9:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

bbob wrote:
i have a couple extra boards coming from ExpressPCB... if anyone would like them at cost + postage please drop me a PM with your email address.

thx
bbob


I sent you a PM yesterday..
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janvanvolt



Joined: Nov 24, 2005
Posts: 285
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PostPosted: Fri Nov 20, 2009 3:36 am    Post subject: Reply with quote  Mark this post and the followings unread

also PM sent.
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