Żłob Modular: Entropy Expander Patches by Andy Ortmann and Colored Noise Wind Emulation Demo

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DisappearHere
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Post by DisappearHere » Sun Aug 06, 2017 10:31 am

Just knocked up the MinEQ in about an hour. Easy build and does exactly what it should. Should also note that the international shipping was fast, and I was impressed with the packaging (and included stubby holder). Thanks Keven!

Jefro
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Post by Jefro » Fri Oct 27, 2017 10:31 am

I absolutely love your modules, onurkalaycioglu. Once that dual VCO is available, I'll definitely pick up one plus a VnIcursal VCA. I can't wait!

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onurkalaycioglu
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Post by onurkalaycioglu » Fri Mar 02, 2018 12:22 pm

been a while since ive posted here. thanks DisappearHere and jefro.

some of you might have seen this, as i posted on my site and in the euro sub forum. but maybe there will be more interest here. in the euro forum people seem to care more about a boba fett mult than what i spent probably a half a year working on(the dual vco)

Image

sorry no real picture yet

Built: $230
DIY kit: $145
pcb/panel:$35
(pcbs come with smd matched transistors pre-soldered, everything else is through hole)

The Dual VCO is a 4hp dual analog voltage controlled oscillator. Each VCO has square, triangle, and sine wave out, coarse and fine tuning controls, a control voltage input, and a switch for selecting exponential or linear cv in.

When a control voltage is inserted, the fine tune control becomes an attenuator for the incoming voltage. In exponential mode, when the attenuator is fully clockwise, the VCO will track around 5 volts per octave.

Each VCO runs from 5 seconds a cycle up to 18k hz

Very Stable, Temperature compensated

current consumption: +12v 20mA, -12v 38mA

45mm deep

There are two main flaws to this 8038 oscillator design

Below 300 hz the waveform symmetry is slightly off. triangle waves get a little uneven in the lfo range they are more asymmetrical, the sine is not completely perfect to begin with the bottom trough and in the lfo range it slopes slightly, and the square turns more trapezoidal above 1khz(see scope shot, a post down)

Also it doesn’t track 1 volt per octave perfectly. usually the 2nd and 4th octave will be a couple cents off.

Other than those idiosyncrasies, it is a powerful, stable dual oscillator in a small footprint with no cross talk between oscillators. It’s great for: drones and beating sine or triangle waves, cross modulating itself for interesting clocks/LFOs, creating complex waveforms/timbres through lin/exp frequency modulation.

also there will be an alternate "normal" silver aluminum panel with black screen print and no extraneous graphics coming out next month. im calling these panels the soul-less series...

Thonk will be getting kits and pcb/panels soon, in a week or so and Wurlys in Tokyo will be getting some built ones most likely this month. perfect circuit will get some built ones probably this month. modular addict and synthcube tbd. otherwise you can buy things direct.
Last edited by onurkalaycioglu on Mon Mar 05, 2018 10:20 pm, edited 1 time in total.
Żłób modules, pcbs, and kits available at:
http://zlobmodular.com/

My Eurorack compositions for vinyl "Tholins of Kharon" is out 11/23/19
http://zlobmodular.com/music/

Solo modular synth recordings using Buchla, Serge, and Eurorack:
https://onurzlobnicki.bandcamp.com/album/

Eps by my metal band
http://burningchurches.bandcamp.com/releases

mihozu
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Post by mihozu » Mon Mar 05, 2018 5:07 am

Really interested by this dual vco module! Wondering how it sounds
Would there be some audio demo available somewhere?

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onurkalaycioglu
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Post by onurkalaycioglu » Mon Mar 05, 2018 10:18 pm

mihozu wrote:Really interested by this dual vco module! Wondering how it sounds
Would there be some audio demo available somewhere?
just posted this short demo on my instagram

dual vco demo

heres some scope shots

Image
Żłób modules, pcbs, and kits available at:
http://zlobmodular.com/

My Eurorack compositions for vinyl "Tholins of Kharon" is out 11/23/19
http://zlobmodular.com/music/

Solo modular synth recordings using Buchla, Serge, and Eurorack:
https://onurzlobnicki.bandcamp.com/album/

Eps by my metal band
http://burningchurches.bandcamp.com/releases

basicbasic
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Post by basicbasic » Mon Mar 05, 2018 11:58 pm

Pretty amazing feat getting this into 4HP. Looks like the perfect little analog FM module i've been hoping for :tu:

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Cryaaa
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Post by Cryaaa » Tue Mar 06, 2018 8:15 am

Looks really nice and definately really handy for fm........ Do you know when the boards will be availible anywhere in Europe?

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degeneratedsines
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Post by degeneratedsines » Wed Mar 28, 2018 3:42 pm

They are available from Thonk, just got mine there :)

About the 8038, the BOM does not state whether to use ICL8038 or XR8038 and the suggested ebay seller has both.

Doing a search, ICL8038 seems to pop quite often on Muff compared to XR8038, so should I get ICL8038's?

mihozu
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Post by mihozu » Thu Mar 29, 2018 10:40 am

i got this dual vco built and running and i like it very much

onurkalaycioglu? i was wondering if there would be a procedure to calibrate something with the variable resistors (maybe the "squareness" of the square output)?

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onurkalaycioglu
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Post by onurkalaycioglu » Thu Mar 29, 2018 12:35 pm

@basicbasic
thanks

@cryaaa
sorry i missed this, i dont always get email notifications. but as degenerated pointed out they are at thonk.
degeneratedsines wrote:They are available from Thonk, just got mine there :)

About the 8038, the BOM does not state whether to use ICL8038 or XR8038 and the suggested ebay seller has both.

Doing a search, ICL8038 seems to pop quite often on Muff compared to XR8038, so should I get ICL8038's?
i use the icl version. i tried both versions and the xr didnt exhibit any improvements to the circuit.

@mihozu

the square wave is not square enough for you? or do you mean in the upper registers it gets trapezoidy?
Żłób modules, pcbs, and kits available at:
http://zlobmodular.com/

My Eurorack compositions for vinyl "Tholins of Kharon" is out 11/23/19
http://zlobmodular.com/music/

Solo modular synth recordings using Buchla, Serge, and Eurorack:
https://onurzlobnicki.bandcamp.com/album/

Eps by my metal band
http://burningchurches.bandcamp.com/releases

mihozu
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Post by mihozu » Thu Mar 29, 2018 6:10 pm

the square wave is not square enough for you? or do you mean in the upper registers it gets trapezoidy?
oh no it is quite square! sorry, my question should have been, what's the role of the trimmer resistors, which i found out in your build document!

but what would be the way to make the two oscillators more "identical" in their frequency range and v/oct response?

also weird thing, when in linear mode, the frequency decreases with increasing voltage (it behaves as expected in exponential mode)??

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onurkalaycioglu
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Post by onurkalaycioglu » Mon Apr 02, 2018 1:33 pm

mihozu wrote:
the square wave is not square enough for you? or do you mean in the upper registers it gets trapezoidy?
oh no it is quite square! sorry, my question should have been, what's the role of the trimmer resistors, which i found out in your build document!

but what would be the way to make the two oscillators more "identical" in their frequency range and v/oct response?

also weird thing, when in linear mode, the frequency decreases with increasing voltage (it behaves as expected in exponential mode)??
o sorry i misunderstood your question. yea the trimmers are for volt per octave and high frequency trimming for tracking.

ray wilson has some good videos on adjusting tracking and hf trim.

so i follow his method mostly
"before you start trimming voct stuff, set the hf trim for both oscillators as low as possible. meaning fully counter clockwise, which is going to be quite a few turns on a 25 turner. you should hear a tiny click when it reaches its minimum. now make sure the oscillator you are trimming is in exponential mode and the fine tuner/attenuator panel control is fully clock wise. there are different ways of setting the tracking with midi controllers and frequency counters but this is my method.

the main thing is you need something that can spit out reliable stable dc voltages to test the various octaves. i use pressure points coming out the sequenced outputs, and i set each step to 0v, 1v, 2v, 3v, 4v, 5v and measure that with a multimeter. i assume you could do the same with most sequencers. then i plug those voltages into the cv in on the oscillator and set it to a low pitch around 70-100 hz(the note C for example, but it can be any note) with 0v in. i use a free guitar tuner app on my phone that also measures hertz. so, then i start cycling through the 5 voltages ensuring each octave is double the hertz(ie the same note an octave higher).

you will notice between 0v and 1v that the notes might be off from each other, turn the voct trimmer so they are closer. the first pass of trimming will be a rough one, as once we reach 5v you will need to start injecting the voltage from the hf trim back into the circuit. once you reach the 5th octave you will notice the pitch to be around a step or so off from your target note. turn the hf trim to the right to tune up.

now return to 0v, you might notice the original target pitch has changed so tune that back to where it was with the frequency panel control. now repeat going through the octaves and trimming with the voct trimmer(you will notice the 1st and 3rd octaves will be a couple cents off from the target note, this is normal) get as close as you can. once you reach 5v you will most likely need to adjust the hf trim again.

you will have to repeat this process several times to reach the equilibrium between the voct trimmer and hf trim."

sorry thats long...

for now, the inverse linear response is normal operation. i plan to fix it in future revisions.
Żłób modules, pcbs, and kits available at:
http://zlobmodular.com/

My Eurorack compositions for vinyl "Tholins of Kharon" is out 11/23/19
http://zlobmodular.com/music/

Solo modular synth recordings using Buchla, Serge, and Eurorack:
https://onurzlobnicki.bandcamp.com/album/

Eps by my metal band
http://burningchurches.bandcamp.com/releases

zorglub76
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Post by zorglub76 » Tue Apr 03, 2018 8:35 am

Hey, Onur, is there a plan for making dual LFO in the near future?

I don't need a VCO atm, but a relatively slow LFO (something like 0.1Hz) would suit me great. Can it be done by modifying this Dual VCO (I have no EE knowledge, but in my head a LFO works with the same circuit as VCO, just with different values of certain capacitors and resistors)?

If that is possible, what parts should I experiment with?
Last edited by zorglub76 on Tue Apr 03, 2018 1:02 pm, edited 1 time in total.

mihozu
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Post by mihozu » Tue Apr 03, 2018 10:31 am

Thank you very much for the detailed calibration instructions!
Much appreciated!

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onurkalaycioglu
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Post by onurkalaycioglu » Mon May 07, 2018 1:57 pm

zorglub76 wrote:Hey, Onur, is there a plan for making dual LFO in the near future?

I don't need a VCO atm, but a relatively slow LFO (something like 0.1Hz) would suit me great. Can it be done by modifying this Dual VCO (I have no EE knowledge, but in my head a LFO works with the same circuit as VCO, just with different values of certain capacitors and resistors)?

If that is possible, what parts should I experiment with?
sorry i missed this, yes the 3hp skew fade lfo is coming out in a couple weeks. it can go 3 minutes and 30 seconds a cycle. but its not voltage controlled besides vc fade between skewable sine and square.

you can switch out the 0.01uf caps on the dual vco with bigger ones to go slower, but the waveform symmetry gets pretty off the lower you go.



Image

10% off site wide sale going on the month of May. make sure you get in touch before placing an order to work out the discount, its not easy to refund especially internationally without paying fees with paypal nowadays.
Żłób modules, pcbs, and kits available at:
http://zlobmodular.com/

My Eurorack compositions for vinyl "Tholins of Kharon" is out 11/23/19
http://zlobmodular.com/music/

Solo modular synth recordings using Buchla, Serge, and Eurorack:
https://onurzlobnicki.bandcamp.com/album/

Eps by my metal band
http://burningchurches.bandcamp.com/releases

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onurkalaycioglu
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Post by onurkalaycioglu » Fri Jun 29, 2018 10:30 am

Image

The SF-LFO is a 3hp all analog low frequency oscillator capable of a plethora of waveforms. It has three rate settings ranging from 3 minutes and 30 seconds a cycle up to audio range at 20 hz. Triangle waves can be skewed between saws and ramps, and square waves pulse width can be adjusted. The LFO's unique feature is voltage controlled cross fading between skewable sine and square waveforms. It can even be self patched(ie triangle into fade cv) for an extended pallet of waveforms. Bicolor led provides constant display of positive and negative voltage crossings.

available now
built $80, kit $50, pcb/panel $20

demos
[video][/video]

[video][/video]
Żłób modules, pcbs, and kits available at:
http://zlobmodular.com/

My Eurorack compositions for vinyl "Tholins of Kharon" is out 11/23/19
http://zlobmodular.com/music/

Solo modular synth recordings using Buchla, Serge, and Eurorack:
https://onurzlobnicki.bandcamp.com/album/

Eps by my metal band
http://burningchurches.bandcamp.com/releases

zorglub76
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Post by zorglub76 » Thu Aug 30, 2018 5:26 am

Just finished the Skew Fade LFO and I'm loving it.

Small - checked!
Easy build - checked!
50ms to 271s wavelength - checked!
Skiff friendly with 43mm depth - checked!
Nice, non-boring, cv-controllable wave shapes - checked!

Kudos onurkalaycioglu!

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onurkalaycioglu
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Post by onurkalaycioglu » Tue Sep 04, 2018 2:04 pm

zorglub76 wrote:Just finished the Skew Fade LFO and I'm loving it.

Small - checked!
Easy build - checked!
50ms to 271s wavelength - checked!
Skiff friendly with 43mm depth - checked!
Nice, non-boring, cv-controllable wave shapes - checked!

Kudos onurkalaycioglu!
thanks i appreciate that.


im hosting a beginner sdiy workshop at knobcon this year. we will be building passive attenuators the 4hp attenumixer and the 2hp miniatt.

workshops this saturday at 11am

more info here

Knurbcon Zlob Workshop

Image
Żłób modules, pcbs, and kits available at:
http://zlobmodular.com/

My Eurorack compositions for vinyl "Tholins of Kharon" is out 11/23/19
http://zlobmodular.com/music/

Solo modular synth recordings using Buchla, Serge, and Eurorack:
https://onurzlobnicki.bandcamp.com/album/

Eps by my metal band
http://burningchurches.bandcamp.com/releases

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onurkalaycioglu
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Post by onurkalaycioglu » Fri Sep 28, 2018 5:38 am

Doing another workshop this Sunday at the Dutch modular fest in The Hague. It's once again focusing on soldering easier passive modules(attmix and miniatt) although if anyone wants help soldering something more difficult come by Sunday the 30th 14.00-19.00.

Dmf Zlob workshop info

I'm also doing a short noise/drone set tonight at the festival if anyone is interested.
Żłób modules, pcbs, and kits available at:
http://zlobmodular.com/

My Eurorack compositions for vinyl "Tholins of Kharon" is out 11/23/19
http://zlobmodular.com/music/

Solo modular synth recordings using Buchla, Serge, and Eurorack:
https://onurzlobnicki.bandcamp.com/album/

Eps by my metal band
http://burningchurches.bandcamp.com/releases

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onurkalaycioglu
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Post by onurkalaycioglu » Wed Oct 31, 2018 3:35 pm

finally announcing the new revision of the entropy. 3hp expander coming soon.



Image




Entropy is an all analog random voltage and noise generator. It features sample/track and hold normalled to white noise with a toggle switch for selecting sample(switch right position) or track(switch left position) and hold function. There is also a pcb trimmer(at the top of the motherboard) to adjust the spread(gain) of random voltages out from “scalar” (low gain, counter clock wise) to large interval jumping(high gain, clock wise).

All analog white, pink, and brown(red) noise 10vpp~(dependent on white noise gain trim). Smooth(infra red) random cv out at 10vpp with 2 range settings from wiggley with (more events, switch in left position) to almost random rise and fall envelope behavior(less events, switch in right position). White noise pcb trimmer sets the amplitude of the white noise which in turn influences the rate of the infra out.

LED solder mask windows display positive(red) and negative(blue) voltage crossings

built $100
kit $70
pcb/panel $25

heres a short overview of the new entropy with gearslutz
[video][/video]

Happy Halloween
Żłób modules, pcbs, and kits available at:
http://zlobmodular.com/

My Eurorack compositions for vinyl "Tholins of Kharon" is out 11/23/19
http://zlobmodular.com/music/

Solo modular synth recordings using Buchla, Serge, and Eurorack:
https://onurzlobnicki.bandcamp.com/album/

Eps by my metal band
http://burningchurches.bandcamp.com/releases

BACH
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Post by BACH » Fri Dec 28, 2018 8:21 am

I got the new Entropy kit as a Christmas present. It was great fun to put together (I'm sort of new to this, this was my 8th build, I have put together bigger kits like a Hades and a lilErebus and also I have created some very simple modules myself, a mixer, a baby 10 sequencer and the like, simple stuff) but I'm afraid I made a mistake somewhere with this, because I can't get it to work properly.
I get noises from white, pink brown and also the infrared is working fine. But the sample/track and hold output is just a very low voltage until I feed a square into the Hold, then it jumps to 10v where it stays constant until I turn off the power on my bus board.

I have no idea of how to troubleshoot, so does anybody have any idea of where I should start looking for mistakes? Could it be wrongly placed resistors? Or perhaps a simple short-circuit somewhere? I tried replacing the two 10uF caps, because I thought I might had burned them, but that didn't do it.

Besides the stupid mistake I obviously have made, this was a great kit to solder. Very compact and great looking!

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onurkalaycioglu
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Post by onurkalaycioglu » Tue May 21, 2019 2:46 pm

@bach
sorry i missed this, did you figure it out?


seems like forever since ive posted here but have been busy with lots of new things coming out this year.

first major announcement is i have a new website! head over to zlobmodular.com to check it out.

second big announcement is i am now stocking right angle patch cables in 3 colors:

red, black, and glow in the dark

in 4 length to start
6", 12", 18", and 24" or (15cm, 30cm, 45cm, and 60cm)

for now im only selling 5 packs consisting of one color and one length. but eventually i will start selling mixtures of colors and lengths.

Image
Żłób modules, pcbs, and kits available at:
http://zlobmodular.com/

My Eurorack compositions for vinyl "Tholins of Kharon" is out 11/23/19
http://zlobmodular.com/music/

Solo modular synth recordings using Buchla, Serge, and Eurorack:
https://onurzlobnicki.bandcamp.com/album/

Eps by my metal band
http://burningchurches.bandcamp.com/releases

wanderer_00
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Post by wanderer_00 » Tue May 28, 2019 7:34 am

love Żłob modules, keep it coming :)

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drowld
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Post by drowld » Tue May 28, 2019 10:20 am

How are they different from tendrils cables ?
Except that they are in stock and available to buy which is a big + hehe

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onurkalaycioglu
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Post by onurkalaycioglu » Tue May 28, 2019 2:37 pm

@wanderer_00
thanks, they will be. lots of new modules coming out this year.
drowld wrote:How are they different from tendrils cables ?
Except that they are in stock and available to buy which is a big + hehe
they are not different, although they are manufactured at a different factory in china. ive never owned any tendrils cables but from some ive seen i think mine have a slightly different top to the cable. other than that, im based in chicago so shipping is cheaper(and faster than shipping from Australia) if youre located in the US, my overall prices are a bit lower than his, and he doesnt sell red or glow in the dark right angles.
Żłób modules, pcbs, and kits available at:
http://zlobmodular.com/

My Eurorack compositions for vinyl "Tholins of Kharon" is out 11/23/19
http://zlobmodular.com/music/

Solo modular synth recordings using Buchla, Serge, and Eurorack:
https://onurzlobnicki.bandcamp.com/album/

Eps by my metal band
http://burningchurches.bandcamp.com/releases

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