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 Forum index » DIY Hardware and Software » Rob Hordijk DIY Designs
Show your Benjolin / Zeitgeist
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macumbista



Joined: Sep 12, 2007
Posts: 384
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PostPosted: Tue Mar 18, 2014 8:10 am    Post subject: Reply with quote  Mark this post and the followings unread

A Static Environment for Complementary Instabilities from macumbista on Vimeo.



A Static Environment for Complementary Instabilities

++dual butterfly benjolin++chaotic feedback++
++symmetrical patching++high resonance++
++total harmonic distortion++
++no changes++no cuts++
++get hypnotized++

18 march 2014

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fluxmonkey



Joined: Jun 24, 2005
Posts: 705
Location: cleve

PostPosted: Thu Jan 29, 2015 1:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

steve from Telecult Powers got my first Zeitgeist, and the wife appropriated my Benjolin, so i had to replace 'em. The modules, not the friends & family.

b


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Repeater



Joined: Mar 19, 2011
Posts: 13
Location: Rochester

PostPosted: Wed Feb 04, 2015 5:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's my Double Benjolin.
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Blue Hell
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Joined: Apr 03, 2004
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Location: The Netherlands, Enschede
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PostPosted: Wed Feb 04, 2015 5:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

Repeater wrote:
Here's my Double Benjolin.


looks nice! the Green vs Blue I guess.

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modulator_esp
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Joined: Feb 04, 2005
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PostPosted: Wed Feb 04, 2015 6:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

very nice
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Starspawn



Joined: Jun 14, 2013
Posts: 73
Location: Oslo

PostPosted: Mon Feb 16, 2015 11:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Heres my Benjolin in Euro.
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With most of the Caspar mods. [/img]
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L´Andratté



Joined: Sep 23, 2012
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PostPosted: Sun Mar 15, 2015 12:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

fluxmonkey wrote:
steve from Telecult Powers got my first Zeitgeist, and the wife appropriated my Benjolin, so i had to replace 'em. The modules, not the friends & family.

b


Laughing

Looking cool (the others also!)

Those three pots to the left are they extra cv attenuators?
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fluxmonkey



Joined: Jun 24, 2005
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PostPosted: Sun Mar 15, 2015 12:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

L´Andratté wrote:
Those three pots to the left are they extra cv attenuators?


yes, external CV ins for both oscillators and the filters. the osc. inputs are normaled to the opposing oscillator triangle outputs, for cross-modulation if nothing's patched in to them.

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L´Andratté



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PostPosted: Sun Mar 15, 2015 1:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

transformer

Nice.I´m currently planning on building a dual benjolin in a nice metal box I found. Will bring out all inputs and outputs to the front.

I figured stuff like if both 4021s are chained in series and clocked from the same osc, the output of the 2nd 4021 will be a delayed version of the first, could yield interesting arabesques. And much more. Inspiring circuit!

EDIT: actually Rob describes just that in this threadhttp://electro-music.com/forum/topic-41489.html
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fetideye



Joined: Jun 22, 2015
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PostPosted: Sat Oct 10, 2015 2:37 am    Post subject: my benjolin
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here's my benjolin i build (a while ago)
I rewired it yesterday, because the header pin wires were failing, those were very thin wires!

replaced the 7809 as well.

now all is well again Smile
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L´Andratté



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PostPosted: Thu Jan 07, 2016 12:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Surprised Fetideye- what happend to your connector? And regulator too?
Nice looking box you have there. I´m still building my double benjolin (that will live in an old east german toolbox) and are interested in your xperiences happy smoker

Macumbista- Your butterfly benjolin is killer. And letterstamped is so beautiful if done well, I could never achieve that when I tried, maybe I should try again...
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macumbista



Joined: Sep 12, 2007
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PostPosted: Thu Jan 07, 2016 12:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

L´Andratté wrote:
Macumbista- Your butterfly benjolin is killer. And letterstamped is so beautiful if done well, I could never achieve that when I tried, maybe I should try again...


Thx! It is very time consuming. I've been CNCing them lately, but that also isn't the quickest process in the world!

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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fetideye



Joined: Jun 22, 2015
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PostPosted: Thu Jan 07, 2016 2:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

L´Andratté wrote:
Surprised Fetideye- what happend to your connector? And regulator too?
Nice looking box you have there. I´m still building my double benjolin (that will live in an old east german toolbox) and are interested in your xperiences happy smoker


i etched the pcb myself. the holes for the regulator were a bit too small and i couldn't get a fitting regulator. because of this, I had some problems with the power (only 1 side worked sometimes)

i wired the headers with dupont wire (with connectors) , that was a bad choice.

ps: a a synth meeting I met a guy who had modded his benjolin with multiturn pots (as fine frequency control) . I think i'm going to do that too!
(wired over the existing frequency pots)
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macumbista



Joined: Sep 12, 2007
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PostPosted: Fri Jan 08, 2016 6:05 am    Post subject: Reply with quote  Mark this post and the followings unread

fetideye wrote:
i etched the pcb myself. the holes for the regulator were a bit too small and i couldn't get a fitting regulator. because of this, I had some problems with the power (only 1 side worked sometimes)


This could also be because of the regulators themselves. Rob recommends putting reverse-biased diodes just after the regulators to prevent this, it's written somewhere in the documentation Wink


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L´Andratté



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PostPosted: Sun Feb 14, 2016 7:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Here´s my Twinjolin, labeling will be following with old school Dymo- I just love the rundown industrial look...

Thanks Rob, a lot of fun already!
And thanks Macumbista for inspiration Very Happy

a few mods:
-switch for loopx1/off/loopx2
-switch for loop lenght, 6/8 steps on rungler 1, 7/8 steps on rungler 2
-switch for crossfeed of selected output bits rungler 1 into data in on rungler 2 (and vice versa for weird canons)
-ext. clock inputs on both runglers for syncing the runglers etc.
-Hp/Bp outs added (especially love the Hp)
-internal resonance trimmer (parallel to R28) for max.Q up to self oscillation (which is actually not desirable as s.o. is frequency dependent and sets in with high squealing, but you can trim resonance to the edge, for for even more wet/pingy sound than given circuit)

Powersupply is MFOS circuit, jacks are 3,5mm type high quality

Dual Zeitgeist will be following! I found the pcb layout on muffwiggler-

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macumbista



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PostPosted: Mon Feb 15, 2016 9:15 am    Post subject: Reply with quote  Mark this post and the followings unread

L´Andratté wrote:
Here´s my Twinjolin, labeling will be following with old school Dymo- I just love the rundown industrial look...

Thanks Rob, a lot of fun already!
And thanks Macumbista for inspiration Very Happy

a few mods:
-switch for loopx1/off/loopx2
-switch for loop lenght, 6/8 steps on rungler 1, 7/8 steps on rungler 2
-switch for crossfeed of selected output bits rungler 1 into data in on rungler 2 (and vice versa for weird canons)
-ext. clock inputs on both runglers for syncing the runglers etc.
-Hp/Bp outs added (especially love the Hp)


Looks great! Love the metal toolbox enclosure!

I'd be curious to see what you did for the loop length mod. Also, the HP/BP outputs are just tapped from different places in the filter architecture, or did you need to buffer them, etc?

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L´Andratté



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PostPosted: Tue Feb 16, 2016 1:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks!

Loop lenght: really simple, put the node of R16/R17 on the middle lug of a switch, and put the bit out pins of the 4021 on the outer lugs...
You could use 3throw switch for all possibilities, but I used 2 throw...

It would probably be good practice to buffer the filter outs, but I think it is not necessary with any sane load impedance (just as the original lp out).

The crossfeed feature is a winner, btw. With the runglers synced, benj2 plays the pattern of benj1 with eight step delay, trhat ties everything together nicely, I recorded a little piece, that I will upload asap (I record on cassette) cyclops
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