TWO59 COMPLEX VCO (by FEEDBACK)

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strat-1
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TWO59 COMPLEX VCO (by FEEDBACK)

Post by strat-1 » Sun Oct 16, 2016 10:28 pm

UPDATE : The FEEDBACK Store is online now :
www.feedbackmodules.com

Image

PLEASE USE THIS THREAD FOR QUESTIONS RELATING THE PROJECT AND THE KITS, USE THE DEDICATED THREADS FOR TROUBLESHOOTING AND TECHNICAL QUESTIONS. THANK YOU.

TWO59 is a complex oscillator consisting of 3 modules : two identical triangle core vco's (one main vco and one for modulation) and a shaper module.
You have the option to use the VCO independently or two VCOs in conjunction with the shaper module as a complex oscillator.

Because of the triangle core, the VCO's work very well for FM modulation.

TWO59 is not a clone of the original 259, but an enhanced adaptation of the classic circuit to eurorack format with many additional features.
Also our goal was to replace most obsolete parts with current products where possible, to make parts sourcing less problematic. Of course there are a few places where the original parts were essential for correct functionality.


Some of the features:
-standalone eurorack modules, so if you want you can only build and use the VCO
-4 independent buffered outputs that can be used simultaneously with the shaper module
-more stable core using THAT340 matched pairs transistors which provides a higher correct octave range than the original circuit
-more trimming options added in the shaper section to make tuning easier


This is a highly complex project, it is not recommended to beginners. You need some skills and experience with previously built projects.
Also this project involves many expensive parts. Before deciding to build it we recommend to consult the BOM list and the build docs to have a better idea about the complexity of the project.
An oscilloscope, a multimeter and a frequency meter are essential to make the building and calibration process easy. Calibrating by ear is not an option if you want the complex oscillator to work correctly.

We tried to make the documentation as detailed as possible and we added a comprehensive calibration section.

Even if you are an experienced builder with good electronics knowledge we recommend to take a look at the
manual in the process of building, it contains details that can ease your build.

The project is divided in three threads:

- This thread for details about availability and ordering. The main post of the project.
- the VCO thread including the building docs.
viewtopic.php?t=169991
- the SHAPER thread including the building docs.
viewtopic.php?t=169992


As previous FEEDBACK projects, I will not sell the pcbs without front panels.

FOR ORDERING PLEASE SPECIFY THE QUANTITY OF EACH TYPE OF MODULE (EX. IF YOU WANT A FULL UNIT :2XVCO KIT?, 1XSHAPER KIT?)
THE VCO CAN BE BOUGHT SEPARATELY AND THIS WILL CREATE CONFUSION IF YOU DON'T SPECIFY THE TYPE OF MODULE YOU WANT.

VCO KIT1: 2PCBs + Front Panel 25EUR (20pcs.)
VCO KIT2: 2PCBs + Front Panel 35EUR (20pcs.)
+ 2XPN3565 (matched)
+ 2N5457 preselected for correct sine shape (limited stock)
+ 2 resistors preselected for correct sine shape
VCO KIT3: 2PCBs + Front Panel 55EUR (10pcs.)
+ 2XPN3565 (matched)
+ 2N5457 preselected for correct sine shape (limited stock)
+ 2 resistors preselected for correct sine shape
+ 8Xjack sockets, 5X9mm pots (10KB, 20KB, 50KA), 4X Cream Knobs 1900h type, 1X big cream Knob 1510 type
+ 1x14 way header MALE, 1x14 way header FEMALE

KIT1 :

Image

KIT2 :

Image

KIT3 :

Image

SHAPER KIT1: 3PCBs + Front Panel 35EUR (10pcs.)
SHAPER KIT2: 3PCBs + Front Panel 55EUR (10pcs.)
+ 2XPN3565 (matched)
+ 2XLF13331 (tested)
+ 1X2N3958 dual fet (tested)
+ 1X79L06 (hard to get in some places)
SHAPER KIT3: 3PCBs + Front Panel 80EUR (5pcs.)
+ 2XPN3565 (matched)
+ 2XLF13331 (tested)
+ 1X2N3958 dual fet (tested)
+ 1X79L06 (hard to get in some places)
+ 6Xjack sockets, 6X10KB 9mm pots, 4X Cream Knobs 1900h type, 2X big cream Knob 1510 type
+ 2x2 way header MALE, 2x2 way header FEMALE
+ 1x8 way header MALE, 1x8 way header FEMALE
+ 2X10 way header MALE, 2x10 way header FEMALE
+ 1x20way2row Header MALE, 1x20way2row Header FEMALE

KIT1 :

Image

KIT2 :

Image

KIT3 :

Image

You can find all the kits and full modules to : www.feedbackmodules.com


Audio demos :

The sound clicks are from computer latency, not from the modules :)
Somehow I forgot to record the ramp wave. I will record it soon.

https://soundcloud.com/strat1/two59-square
https://soundcloud.com/strat1/two59-triangle
https://soundcloud.com/strat1/two59-sine
https://soundcloud.com/strat1/two59-shaper-basics
https://soundcloud.com/strat1/two59-shaper-modulations
https://soundcloud.com/strat1/two59-two59s-on-the-bread

This demo uses 2 Full modules and one additional VCO (5VCO's in total). For this I didn't used extreme modulations, it's a demo to demonstrate how good is the tracking of VCOs on notes.
It was recorded real time.
-The starting bass line panned to the left speaker is a triangle wave passing to a jupiter8 filter module, to know how will sound affected by a VCF.
-The second line panned more to the right is the ouput of one shaper directly to a VCA. I turn the timbre slowly in various points of the song.
-For the other two lines I used some spring reverb.
-The ending is with pitch (fm) modulation ON.
-All the VCO's stayed in tune for a period of 3 hours until I closed the system.

Image

[video][/video]

Other Feeback projects you can build :

CP3+ Mixer :
viewtopic.php?t=158439
SmArTT verter :
viewtopic.php?t=158691
106 Chorus :
viewtopic.php?t=158257
PRE CR :
viewtopic.php?t=163228
PRE BX :
viewtopic.php?t=163224
PRE KM :
viewtopic.php?t=163227
106 Chorus :
viewtopic.php?t=166892
Last edited by strat-1 on Wed Jul 19, 2017 8:36 am, edited 12 times in total.

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GryphonP3
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Post by GryphonP3 » Sun Oct 16, 2016 10:37 pm

Oh heeeeeell yeah!!! Been waiting on this forever!!

Will take a Kit2 please!
My cat can eat a whole watermelon ...

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gwaidan
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Post by gwaidan » Sun Oct 16, 2016 11:36 pm

Looks great!

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mush
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Post by mush » Sun Oct 16, 2016 11:42 pm

Kit 3 please.

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Isaiah
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Post by Isaiah » Mon Oct 17, 2016 12:11 am

These look ace! Well done!

What sort of range are the CV inputs expecting? 0~5V? 0~10V? +/-5V?
What are the output levels of the VCOs, still Buchla level or amplified?

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strat-1
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Post by strat-1 » Mon Oct 17, 2016 3:11 am

Isaiah wrote:These look ace! Well done!

What sort of range are the CV inputs expecting? 0~5V? 0~10V? +/-5V?
What are the output levels of the VCOs, still Buchla level or amplified?
0-10V cv signals with pots to minimum (SYMMETRY, ORDER) only positive voltage.
Attenuverted inputs accept negative voltage input.
Outputs are 4Vpp.

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strat-1
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Post by strat-1 » Mon Oct 17, 2016 3:18 am

FOR ORDERING PLEASE SPECIFY THE QUANTITY OF EACH TYPE OF MODULE (EX. IF YOU WANT A FULL UNIT : 2XVCO KIT?, 1XSHAPER KIT?)
THE VCO CAN BE BOUGHT SEPARATELY AND THIS WILL CREATE CONFUSION IF YOU DON'T SPECIFY THE TYPE OF MODULE YOU WANT.

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Post by Jarno » Mon Oct 17, 2016 3:48 am

Fantastic work, and I still think that build doc with that background is tres cool, the only thing missing is the crease in the middle for the wider pages :D
It is tempting to buy the full thing, but I still have two spare 258j boards I'd like to use so for me:

I'd like 1x Shaper KIT2 (the KIT2 without the headers, just the hard to get silicon).


By the way, there's a typo in the ordering for the SHAPER, the kit with the headers is KIT3 I presume, and right now it says KIT2.

acilator
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Post by acilator » Mon Oct 17, 2016 3:53 am

interested in;
VCO Kit2 2x
Shaper Kit2 1x

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djamsia
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Post by djamsia » Mon Oct 17, 2016 4:50 am

HELLO

interested in;
2x VCO Kit2
1x Shaper Kit2

THANKS!!!

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synthetek
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Post by synthetek » Mon Oct 17, 2016 5:40 am

Interested in

2x VCO Kit 2
1x Shaper Kit 2

Thanks :bananaguitar:

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strat-1
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Post by strat-1 » Mon Oct 17, 2016 6:02 am

Jarno wrote:Fantastic work, and I still think that build doc with that background is tres cool, the only thing missing is the crease in the middle for the wider pages :D
It is tempting to buy the full thing, but I still have two spare 258j boards I'd like to use so for me:

I'd like 1x Shaper KIT2 (the KIT2 without the headers, just the hard to get silicon).


By the way, there's a typo in the ordering for the SHAPER, the kit with the headers is KIT3 I presume, and right now it says KIT2.
I corrected the mistake. Thank you,

You have to connect 258 VCOs at the back of the module with connectors - 4Vpp exact signals (you need to scale them if they are not right).

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astroschnautzer
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Post by astroschnautzer » Mon Oct 17, 2016 6:16 am

interested in:
2x vco kit2
1x shaper kit2

negate
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Post by negate » Mon Oct 17, 2016 1:22 pm

Hi.

This is all great, but where to get the VTL5C3/2 Vactrols?

Cheers.

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fuzzbass
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Post by fuzzbass » Mon Oct 17, 2016 1:38 pm

106 Chorus was a smash! I would take:
4x VCO Kit3
2x Shaper Kit3

Thanks,
Wired for weird

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strat-1
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Post by strat-1 » Mon Oct 17, 2016 1:55 pm

negate wrote:Hi.

This is all great, but where to get the VTL5C3/2 Vactrols?

Cheers.
It's all noted in the BOM list.
You can buy Xvive versions from Thonk (tested in the project).
Or you can find Perkin Elmer old ones on ebay.

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audiohawk
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Post by audiohawk » Mon Oct 17, 2016 6:57 pm

:wookie:
2xVCO Kit2
1xSHAPER Kit2

Thank you!

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nurbivore
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Post by nurbivore » Mon Oct 17, 2016 8:40 pm

awww yiss

2x VCO Kit 2
1x Shaper Kit 2

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paterursus
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Post by paterursus » Mon Oct 17, 2016 9:01 pm

Hi,
Interested in
2x VCO kit 2
1x shaper kit 2

Thanks much for this!

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sduck
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Post by sduck » Mon Oct 17, 2016 10:35 pm

I like it! I want 2 VCO kit 2. and 1 shaper kit 2.
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Willzyx
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Post by Willzyx » Tue Oct 18, 2016 12:32 am

Looks very cool, I am in for
1x Shaper Kit 2

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strat-1
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Post by strat-1 » Tue Oct 18, 2016 3:33 am

Unfortunately all the SHAPER kits are out of stock.
I still have 12 VCO boards in stock for those who want to build just the VCO or want to build the VCOs in advance.

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sduck
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Post by sduck » Tue Oct 18, 2016 11:50 am

Then put me on the waiting list for when you get more!
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sanders
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Post by sanders » Wed Oct 19, 2016 7:26 pm

Yeah, I'd like to be on the list for a Shaper kit 2

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spneca
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Post by spneca » Wed Oct 19, 2016 9:43 pm

Could you put me on the list for 2x VCO kit 3 and 1x Shaper kit 3, please?

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