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

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onurkalaycioglu
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Post by onurkalaycioglu » Wed Aug 03, 2016 1:05 pm

falafelbiels wrote:Well that panel design looks like it is going to be GORGEOUS...
thanks mr biels.

the run of red panels came in and the tolerances are all over the place they look cool but im having my guys rerun them because 90% of them are bad. but heres a sneak peak of more of what they will look like besides that crappy screen shot above. so im hoping to have a better run of them in a couple weeks.

Image


also i have some new blank designs in 2hp for $2.50 each and 4hp for $3 each.
the designs are based on a turkish carpet motif representing ram horns: a symbol of power...

Image


and other news. the panel design for the 3 new 2hp modules are coming together. i have to do another run of protoypes fixing a couple layout things. but if you want a v1 prototype at a discount, get in touch.

also the sale is still going on until the end of august
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

monoopti
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SVF Trimmers?

Post by monoopti » Tue Aug 16, 2016 2:33 pm

I'm going to build a T.H. SVF kit soon. I have some experience building modules, but I've never built a filter before. Can someone please explain how I should set the two trimpots? Thanks!

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onurkalaycioglu
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Re: SVF Trimmers?

Post by onurkalaycioglu » Wed Aug 17, 2016 5:04 pm

monoopti wrote:I'm going to build a T.H. SVF kit soon. I have some experience building modules, but I've never built a filter before. Can someone please explain how I should set the two trimpots? Thanks!
one trimmer is for 1v/oct. you can get fancy with a midi cv converter and a keyboard to trim. or i actually just trim by ear by putting the filter in self oscillation by turning the resonance past 3oclock. i tune a C for example with 0 volts into the voct input and then give it 1 volt from pressure points and trim accordingly to get a C an octave above. you can do this in different ranges/octaves/notes to get a more accurate 1v/oct. this also depends on which revision you have as the rev doesnt use a 2sa798(matched transistor)

the rez trimmer is for attenuating the resistance in the feedback path. this depends on the shunt setting on your filter. up is max, and down trim. i put the filter in self oscillation(like mentioned above) and trim until i get a "stable sine" wave.

this would probably interest you too mr monopoti. the new run of aluminum panels are in for the svf and they are finally right. im selling them for $7 each for current owners of th svfs. pm me if you want one. not sure why its so big...

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

trip
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Post by trip » Wed Aug 17, 2016 6:10 pm

I'm still having some trouble with my th svf, I ended up replacing the transistor pair with a 2sa979 after having a fake 2sa798 crap out on me. The filter works, but doesn't self oscillate and is kind of noisy (for the most part in a good way). The resonance only really seems to kick in around 1-2k hz, and it's like there's a constant low level hum around 2k no matter where the cut off is. I'll record a shitty video on my phone tomorrow to try and demonstrate, it's just kind of weird - it's 75% working, just something off with the resonance. I've double checked all joints and they all seem fine, jumper is on max rez, but on either position it doesn't seem to make a difference, and the trimmer only very slightly alters the amount of resonance (which if I view on the scope with massive voltage multiplier I can see at a very low level). Any ideas where to poke around to fix the resonance? It does resonate, but no way near enough to self oscillate. Part of me just thinks I'll build another and keep this chaotic squawky thing, it screams at max rez when the input signal and cutoff are at a similar frequency - but forking out for another matched transistor is kinda putting me off.

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Post by Grumskiz » Thu Aug 18, 2016 7:40 am

I have a similar problem and I think someone else also reported it. I have a suspicion that it's the capacitors (in the actual filter, not the decoupling caps), but I'm not sure.

trip
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Post by trip » Fri Aug 19, 2016 9:22 am

Yeah, I seem to remember someone else posting about this problem as well, strange as I can't see any problem with my build at all, I wonder if you're right and it's the type of caps we used or something? I haven't had chance to look over the schematic yet, onurkalaycioglu could you point us towards where the res might be going wrong in the circuit?

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onurkalaycioglu
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Post by onurkalaycioglu » Fri Aug 19, 2016 10:32 am

@trip

looking back at some pics, you cant put a 100ohm resistor in parallel with a 100k pot like that. you are most likely overloading the tl071, transistors, and giving the ota the wrong amount of current.

and yes what capacitors you use effect the overall sound of your filter. especially the ones in the integrators. i notice you were using the kind of cheap ceramic kind. i use mlcc, i have the mouser numbers on my site.


@grumskiz
you have the very first revision of the filter, which is probably not ideal. i noticed you hacked together your own sort of exponential converter with 2 transistors. which should work fine but could also effect the sound/operation of your filter. also not sure about the quality of the caps youre using in your filter from the pics couple pages back.


im happy sell you guys both new filter mother boards for $10 and with the anniversary discount(so $8.5) and i can throw in whatever parts you need, that you dont have, like 100ohm trims or the caps i use. pm me.

o and by the way. the new revision of the filter doesnt use a 2sa798. it just uses 2 normal pnp transistors.
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

trip
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Post by trip » Fri Aug 19, 2016 11:06 am

Thanks, I've since swapped out the trimmers for the correct values now, and changed the ics when I put in the new transistor but essentially still had the same behaviour, which looks like this [video][/video]

That's with the trimmer on max res, res knob all the way up doing a slow sweep of cutoff - that lf hum is there as soon as the cutoff gets above that frequency.

So I guess it must be the caps then? I hadn't seen the mouser #'s on your site before, just spotted it now.

Would you mind telling me which are the caps in the integrators? I think I have mlcc caps for all those in the bom and I could try swapping them out.

Thanks for the offer of the new board, definitely going to want to build another at some point but would like to get this one working as it should be as well if possible :tu:

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Post by ImNotDedYet » Sun Aug 21, 2016 12:51 pm

I'm about to finish up my vcIncursal VCA, and it's got a panel I've not seen before. I purchased the kit from Control, and it appears to have a marbled white/blue panel. I noticed someone mentioning taking a sticker off theirs, but this doesn't _appear_ to be a sticker. Were any panels made that sound similar to this?

Am I good to screw everything together, or am I missing something?

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Post by ImNotDedYet » Sun Aug 21, 2016 7:14 pm

ImNotDedYet wrote:I'm about to finish up my vcIncursal VCA, and it's got a panel I've not seen before. I purchased the kit from Control, and it appears to have a marbled white/blue panel. I noticed someone mentioning taking a sticker off theirs, but this doesn't _appear_ to be a sticker. Were any panels made that sound similar to this?

Am I good to screw everything together, or am I missing something?
I just kept it on if it is a sticker. I like the look better than the straight blue. If it actually is a sticker that I can't seem to separate from the panel, it will come off eventually and have "character."

BTW, fantastic module! 6 VCAs in 8 hp, works great on audio and CV! Really digging it. Thank you!

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onurkalaycioglu
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Post by onurkalaycioglu » Thu Aug 25, 2016 5:46 pm

trip wrote:Thanks, I've since swapped out the trimmers for the correct values now, and changed the ics when I put in the new transistor but essentially still had the same behaviour, which looks like this [video][/video]

That's with the trimmer on max res, res knob all the way up doing a slow sweep of cutoff - that lf hum is there as soon as the cutoff gets above that frequency.

So I guess it must be the caps then? I hadn't seen the mouser #'s on your site before, just spotted it now.

Would you mind telling me which are the caps in the integrators? I think I have mlcc caps for all those in the bom and I could try swapping them out.

Thanks for the offer of the new board, definitely going to want to build another at some point but would like to get this one working as it should be as well if possible :tu:
yea thats interesting behavior. the filter should self oscillate almost too easily. usually you have to put the resonance past 3 oclock and then wiggle the cutoff to get it going. the integrator caps are the 330pf ones, and id also change out the 10pf ones to mlccs. both the mouser numbers are on my site.

@imnotdedyet
sorry i missed this. it is indeed tape on the panel to prevent the panel from getting burned up when lasering through. you have to scratch at it a little bit to remove it, and i rub the the finer parts off with a cloth and alcohol. thanks.


also the %15 off sale ends 8/31
and the 3 new 2hp modules should be coming out soon. along with a new prototype panel for the dual vca. featuring led push switches to trigger the vca in 2hp.
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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Post by onurkalaycioglu » Tue Sep 27, 2016 3:45 pm

minimix is a 2hp simple 3 channel dc mixer. its capable of mixing audio or cv based on the potentiometers used. the ic,trimmer, and power filtering caps are smd, the rest are through hole components. there is a trimmer on the pcb to adjust the overall gain close to line level if needed.

built:$70
kit:$40
pcb/panel:$10

the bom is here
https://zlobmodular.com/minimix/


the other two 2hp modules(mineq,miniswitch) will be available for machines in music in a couple weeks as well as the push version of the dual vca and a 2hp dual vclfo hopefully.


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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Post by Grumskiz » Wed Sep 28, 2016 3:04 am

2hp mixer looks great :)
Recently I was looking for the 2hp S&H. Is that one still available or coming back?

I managed to fix the SVF by replacing the 330pf caps in the filter core with polystyrene ones. The other ceramics are NP0.

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Post by Addam » Tue Oct 11, 2016 7:40 am

Apologies if this was previously stated but I didn't find it in the thread or the BOM. Does anyone have a mouser part number for the small B100K pots as needed for the mineq (which I think is the plastic shaft type used in the minimix)?

I don't think a build guide is necessary but photos of these boards stuffed might be helpful, too. Thanks!!

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templar
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Post by templar » Tue Oct 18, 2016 4:01 pm

Hey, I have question about the 6 trimmer resistors on the VnIcursal VCA

Can anyone tell me if they need to be specifically single turn or multi-turn?

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Post by EATyourGUITAR » Tue Oct 18, 2016 4:51 pm

Can i see the min mix from the back?
WWW.EATYOURGUITAR.COM <---- MY DIY STUFF

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Post by Silver » Fri Oct 28, 2016 11:52 am

Hello! Just to jump on the bandwagon, I'd also love to see some Mouser part numbers (or even better a cart).
A picture of the backs of the mineq and minimix would be helpful too.

In particular, I'm having a hard time finding the 10u 0805 polarized caps. Can I use MLCC caps??? :despair:
http://www.mouser.com/Search/ProductDet ... 61E106KA3L

or do I have to get that from Jameco?
Even on Jameco, this was the closest thing I could find...
http://www.jameco.com/z/EEE-1VA100WR-Pa ... 84048.html

Any guidance would be much appreciated.
Thanks!

ImNotDedYet
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Post by ImNotDedYet » Fri Oct 28, 2016 12:02 pm

templar wrote:Hey, I have question about the 6 trimmer resistors on the VnIcursal VCA

Can anyone tell me if they need to be specifically single turn or multi-turn?
I would imagine single turn would be sufficient. I bought a full blown kit, and don't know if the trimmers were single or multi, but having adjusted them I can say there wasn't a whole lot of trimming needed.

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templar
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Post by templar » Fri Oct 28, 2016 1:44 pm

nice one, thanks for the info ImNotDedYet

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onurkalaycioglu
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Post by onurkalaycioglu » Wed Nov 02, 2016 3:09 pm

@grumskiz
great. glad you figured out your filter. i will mention on my site to use better quality integrator caps. yep the s/h is still available although im working on a revision.
Addam wrote:Apologies if this was previously stated but I didn't find it in the thread or the BOM. Does anyone have a mouser part number for the small B100K pots as needed for the mineq (which I think is the plastic shaft type used in the minimix)?

I don't think a build guide is necessary but photos of these boards stuffed might be helpful, too. Thanks!!
so far the mineq doesnt have a bom because its the same circuit as the T.H. EQ and theres a bom for that. but there are a extras and a couple different things so i will put one together soon. mainly smaller 1uf caps from jameco(part no. 94161) and you need a 10mm spacer along with two m3 5mm long screws, i use nylon flat heads from mcmastercarr.

but to answer your question erthenvar sells the b100k song huei trim pots. but thonk or the manufacturer are the only places to get the b500k pot. i mention on my website, but you can order the b500k from me or also if you can deal with the smaller shaft trims with no indicator tayda sells the alpha version of the b500k.

@addam
multi turns would work fine, but as someone else mentioned the trim to "zero" is a really small turn on a normal trim towards negative volts. although if you are looking to trim all your vcas to the exact same dB a multiturn would be what you want.


@eatyourguitar

heres a pic of an early prototype, so this one doesnt have a smd trim on the back. the chip is on the other side between in 3 and the sum out. also the 10uf power filtering caps on the back arent the right size. i assume your wondering how i made my "shitmix" in such a small package.

Image



@silver
and speaking of the minimix. sorry for the confusion about the smd pads, as you can see in the pic you solder through hole parts to the smd pads for the chip and power filtering, although you would probably wanna make the 0.1ufs legs shorter. like in the pic a standard 10uf package would fit but i use these from jameco as they are 4x5mm, part no. 94212. i have some mouser carts floating around but they are for older modules. i have most of my important mouser #s on my site. in the bom it also tells you where to buy the parts, but i think you know that.

Image


i guess i havent announced the mineq over here, so here it is...

The Żłob Modular Mineq is a simple 3 band equalizer which boosts or cuts the low, mid, or high frequencies of your audio source. It passes sound relatively un-altered with each band set at noon. This is not a filter, and full cut settings of all bands will not fully eliminate your source.This EQ is AC coupled so it’s best for audio although it’s possible to eq cv with some interesting results. The Mineq is a 2hp version of the Żłob T.H. EQ.

Image


also on a side note, i have a couple new modules coming out that have been mentioned. i have a illuminated push button version for the dual vca at the fab and miniswitch, a dual passive 2hp attenuator with toggle switches should be out soon depending on how the new prototypes work.

and im about to pull the trigger on a run of alluminum panels for 2 other modules. im getting the minimix and the VnIcursal vca made in red on black. so look out for those in a month or so...
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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Silver
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Post by Silver » Wed Nov 02, 2016 4:05 pm

Thanks Keven
VERY excited about the new aluminum panels!!!
what will the illuminated push button on the dual vca's do?

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Post by Addam » Wed Nov 02, 2016 4:39 pm

Great, thanks for the update. Attenumix was just about as easy a build as there could be and super useful

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Post by maltemark » Thu Nov 03, 2016 5:37 pm

I have a question regarding the TH VCF - on my PCB I can't see the 2SA798s marked, but I do see markings for 2 2N3906. Are these supposed to be used instead on this revision (rev iv)

Or am I just missing the obvious thing? :)

Cheers

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Post by onurkalaycioglu » Fri Nov 25, 2016 2:45 pm

maltemark wrote:I have a question regarding the TH VCF - on my PCB I can't see the 2SA798s marked, but I do see markings for 2 2N3906. Are these supposed to be used instead on this revision (rev iv)

Or am I just missing the obvious thing? :)

Cheers
sorry i missed this. the new version, doesnt have a 2sa798 anymore. just normal pnps. had a problem with my chinese distributor of the matched pairs, and they are not exactly cheap either.


been laying low lately on some releases. but a couple things are coming out soon as well new aluminum panels and pcb panels.

first. i have finally figured out(actually david from bubblesound generously shared his method) how to get my rather complicated graphics into a pcb software, in turn being able to create gerbers and printed circuit board panels of my designs. the test subject was the attmix and they turned out better than imagined in black and white. so pcb panels will be coming(slowly) for most all designs not already made in aluminum. but i still have to get some prototypes made in black pcb with red silkscreen.

second. svf and minimix red on black aluminum panels are in the process of being fabricated and should be delivered some time in december. a couple more designs are hopefully soon to follow.

third.a new version of the dual vca is coming out. this version has illuminated push buttons to essentially turn each vca on or off. there are no cv ins. just 2 separate channels and a sum out of the 2 vca outputs. will post a vid soon. but am waiting to get aluminum panels made for this one before release.

fourth. i made a new version of the miniatt with the switches at the bottom of the pcb instead of the last design which became a little cluttered when all patched up. miniatt is a 2hp dual passive attenuator with toggle switches to activate or kill each channel, both channels are also summed together.

fifth. there is a new version of the clk dv that fixes the minor problems with the last version and also adds some features. mk II is now a musical divider, meaning all the outs go high when reset. the build is also simplified with through hole chips and jumpers oriented on the top and bottom of the pcbs. sending out some test subjects to a couple people.


i know its black friday. and i would have put on a sale, but trying to only get new stuff out there that has either pcb panels or aluminum ones. but if you want some stuff at a discount for today, pm or email me. i can give %15 off.



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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Post by daynehacks » Sat Nov 26, 2016 10:23 pm

Just ordered a TH SVF! excited! One thing I noticed is the BOM looks to be an older rev as it shows 2sa798 which you said isn't used any more.

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