My Rack

When I received my order from 3u Shop there was a extra module in the package. This multiple was one of the first modules I build with my reflow oven. It was small enough to test the oven and with me having to spend a lot of money on parts. Any multiple in your rack can be nice but this one is buffered. Meaning it can also be used for multipling pitch CV’s. I work straight out of the oven…

Well oh well this is a special one. It’s also still in the prototyping fase. The module is a random acid generator and can (also) be used to create basslines. I’m testing this module out and want to thank Budgie for sending me one of these. I still want to do a full build report and review on it. Hopefully I can find the time for that somewhere. Some explanation and demo can be found here https://youtu.be/q4RDT-eKImU (by Budgie Synths)…

I got this filter from a fellow designer. It’s still in the prototype fase and I’m one of the lucky ones to test it. It’s a really nice filter. It resemble the MS-20 filter when listening to it. It have to double check with Budgie is it’s based on that design. It has low pass, band pass and high pass output’s. It can overdrive the resonance quite a lot. I like this one and when it hits the stores be…

I got this filter from a friend of mine. He just send the pcb’s and panels and a link for the bom. As we where both building it we found it had some error’s. After he emailed Cagey we discoverd he accidentally uploaded the old files and our board where made based on that. Knowing what the problems where we finally could build it. I was quite interested in this filter. It uses a chip that not many filters use…

open for offers I build a few of these. When I was working with a Windows machine I could just use one of them. On a Mac I can use all of them. They are for intergration of de DAW with my rack. But since I bought a ES-9 I hardly use them anymore. Posted on December 12, 2021 by Quinie Difficulty to build: Medium, the atmel needs programming

I like the sound of this one. It sometimes remind me of the 303 acid sound. It isn’t quite the same but it can lean to that specific sound. It was a small disaster to build. Lot’s of parts and I just don’t like it when the resitors are standing up. But just because of the sound I might build a second one. This module is open source and on github. https://youtu.be/gA3WmvU1QJ8 (not my video) https://github.com/erica-synths/diy-eurorack Difficulty to build: Hard

It’s been awhile since I’ve build this one. I don’t use it that often in patches. I do need more effects in my rack so it’s kinda strange I don’t use this that much. I have to look it up if it still needs calibrating but the sound it makes doesn’t really get to me. Maybe I will update this post if I have played with it more or when i sold it. Maybe I need to change the led’s…

I build a few of these and what a buggers to build. Still one of them won’t operate as it should. The components are quite dense and prone to make mistakes. But when the do work it’s a nice ADSR. I would not recommend them just because of the poor layout of the pcb’s. I do have a few of them in my rack though. https://github.com/erica-synths/diy-eurorack Difficulty to build: Hard

These mixers I use a lot. I have a few of them all scattered in my rack. With two output they tend to be quite handy. These one I really like and use a lot. Building these is not that hard to do. https://github.com/erica-synths/diy-eurorack Difficulty to build: Easy

I have used this output module a long time before I bought a Expert Sleepers ES-9. It’s still in my rack and I’m still using it some times. It routes all sound to my amp and speakers and sometimes my headphones. It was not a difficult module to build. https://github.com/erica-synths/diy-eurorack Difficulty to build: Medium, Easy

It’s a nice sounding filter. The build is not that difficult and can all be done on one pcb. It has a low pass and a bandpass. It’s not my favorite filter but it does the job it needs to do. https://github.com/erica-synths/diy-eurorack Difficulty to build: Medium/Easy

You can’t have enough VCA thay all said. Well this one is a dual VCA with a mixed output. The VCA it self I do like and use it a lot in my patches. This was one the the DIY version of Erica product I did like to build. The spacing of the components is fine one this one. I have four or five of them in my rack. Not a lot to say it’s a good VCA. https://github.com/erica-synths/diy-eurorack Difficulty…

I just finished building the VCO and did a little bit of testing on it. I might update this post when I have used it a bit more. But first impressions it sounds really good. I like the FM and pulse input and have been playing with those CV inputs and lfo’s a bit and can imagine I would use this in some patches. https://github.com/erica-synths/diy-eurorack Difficulty to build: Hard /Mediumprone to make mistakes on. I did 🙂

I don’t buy that many modules (unless it’s MFB) but this one I made a exception. I needed a good way to combine my rack with my DAW and this module is in my opinion the best to do so. I bought it second hand and only scratched the surface so far but recording my rack has never been so easy. The quality of the recordings is just amazing. I planning on using it to make some recording for the…

I was in need for a sequencer. Then I found this module by Extralife. It’s a nice step sequencer that I use a lot. Maybe also because at this moment it’s the only sequencer I have in my rack. I build two of these. You can but this module build but the files to DIY are available on Github also. As I figured I didn’t need more then two I traded the spare pcb’s and panel for other pcb’s. I…

Oh this one I love so much. Still think about building a second one. These delay is something special. During the build I feel in love with how they have made the manual. Even if your not building this check it out I think it’s one of the best way to make a build manual. The sound this thing can produce is amazing. All depends a bit on how you calibrate it. It can be very clean but also take…

This is a modules based on a famous mixer. As feedback modules tells us: Sound design channel strip based on a famous late eighties small mixer used mostly for the well known TB303 distortion sound. Well indeed it does. It can overdrive your sound but still makes it sound awesome. I believe this was the one where you need to match you transistors. https://feedback-modules.myshopify.com/collections/modules/products/pre-cr YouTube review on Pre CR, KM and BX Difficulty to build: Medium. Has a great build…

This module is based on a famous mixer. As feedback modules tells us: Sound design channel strip based on a famous late seventies small mixer used by many electronic music bands. I like this one as it can overdrive drum sounds quite nicely. The chip it needs can be hard to find. https://feedback-modules.myshopify.com/collections/modules/products/pre-km YouTube review on Pre CR, KM and BX Difficulty to build: Medium. Has a great build manual. Has multiple pcb’s, need a rare part HA1457

I bought this after the 1bit delay cause I was loving there build manuals and I was in need for some noise. Well this modules just makes some noise. From white to pink and dark and digital. If you are in need for noise I can recommend this module. Its also available as a build module. I build the THT version but there is also a SMD version. What more can I say about it.. it’s noise https://feedback-modules.myshopify.com/products/static YouTube Review…

Open to offers I bought the book from Thomas Henry online at Lulu, it was a very good read and it has the MPS explained in it. I always wanted to have this module. And one day Harald had contacted Thomas Henry and got permission to design a pcb and panel for it and release it on the internet. Making this module available for me to build I was stoked. Harald’s design had banana jack and driven by 15volts. I…

Oh I like this one. It sound really good. Harald based this design on the Moog ladder filter. It has mutliple outputs and feeding the 12db output into the second input it can even function as a sine vco. This filter is quite big in size but I tend to use it quite a lot. https://www.haraldswerk.de/Filter/Ladder_24dB_Euro/Ladder_24dB_Euro.html Difficulty to build: Hard

Another filter from haraldswerk. This time a 36db one that can also be used as a sine VCO when plugged in from the 12db output into the second input. I haven’t used it much I just finished calibrating the bad boy. Have to update this post when I have played a bit more with it. https://www.haraldswerk.de/Filter/36dB_Euro/VCF_36dB_Euro.html Difficulty to build: Hard

I have build a few of these and use them quite a lot. I have some spare pcb’s and panels in my drawers to build even more of these. (If you looking for a set contact me). The ADSR does what it should do and like most of Haralds design it very well designed. Harald based his ADSR on an Elektor Formant ADSR schematic. It has pretty good spec’s, if you want to know more about this one be sure…

Open for offers This module is like the normal multiple but it does need power where the normal one doesn’t. It buffers the input and routes it to the seven outputs. The buffering can be important when working with a input that has to be exactly the same on the outputs like pitch. You don’t want your CV input to lose voltage when routing it to seven VCO’s. For trigger or gates it doesn’t have to be important (use the…

I use this module to transpose pitch in some of my patches. But the description on Haraldswerks site says it can do a lot more. Maybe I have to play with it a little more just to test all of that out. I does what the name says it will do, move CV. Harald also release a Quad version to pair with the LFO and VCA. Didn’t build that one yet. https://www.haraldswerk.de/Utilities/CV_Mover_Euro/CV_Mover_Euro.htmlhttps://www.haraldswerk.de/Utilities/Quad_CV_Mover/Quad_CV_Mover.html Difficulty to build: Easy

This mixer I tend to use as my final mixer before sending it to a output module like the Erica Synths Output or my Expert Sleepers ES-9. The nice thing about this module is has a led indicator. The led turns on when there is to much signal going into the mixer. The mixer also has an inverted output and is DC couple so it can be used for audio and CV signals. for panel gerbers: https://www.quinie.nl/panel-haraldswerks-dc-coupled-mixer-with-volume-indicator/ https://www.haraldswerk.de/Mixer/Mixer_Euro/Mixer_Euro.html Difficulty to…

Open for Offers I have a few of these. These are the most simple modules to build and handy to have in your rack. It is just duplicating the input to the seven outputs. It doesn’t need power and if you want to start building a module and never touched a soldering iron this is one to start with more information on building one: https://www.quinie.nl/building-haraldswerks-passive-multiple/And if you are looking for the panel files: https://www.quinie.nl/panel-harladswerks-passive-multiple/ https://www.haraldswerk.de/Utilities/Passive_Multiple/Passive_Multiple.html Difficulty to build : Very…

Open for offers Nice little module that can add signals together. I use this to add pitch signals. Run a sequence in it and then transpose the sequence once in a while. From Haralds website: It can be used in different ways: As three independent adders, as buffered multiple, adding a modulation source simultaneously to all three outputs, adding two, three or four voltages precisely and a few more, depending on your patch. I havve a few of these so…

I build two of these. I changed the capacitor values on one of my build to give me a really slow LFO. I like these LFO’s they end up in a lot of my patches. The module itself is a bit big a takes up quite some space but you never have to switch between outputs like on most other LFO’s where a switch sets the waveform. The waveforms are available straight on the panel. The led’s give a good…

You can never have enough VCA’s in your rack and this module has four of them. I still find this one a bit tricky to calibrate. Maybe I should take it out of my rack and give it a second or third try to calibrate. I don’t use them as much as my other VCA’s (don’t know why). Depending on the build it can be DC or AC coupled. I believe mine is DC but have to double check that.…

This mixer is great for mixing CV sources. I use it to mix LFO’s. I has a offset with negative 5 volt or positive 5 volts. A switch for attenuation (6db) a summing output and a inverted summing output. Handy little tool to have. It’s a bit difficult to calibrate unless you have the right gear, you will need a precise multi meter. https://www.haraldswerk.de/Mixer/Utility_Mixer_I/Utility_Mixer_I.html Difficulty to build : Medium, but you do need a good multi meter and some center…

I mainly use this module to tune my VCO’s. But paired with the precision adder it can also be use to transpose pitch. This module outputs octaves and semi tones. I had to do a little trick to make the headers fit. Maybe will do a build report on this one, so others can do the same cause I still don’t know how the header should fit without this trick. Difficulty to build: Easy /Medium

A big name for a module “Trapezoid quadrature through zero VCO”. Well as you can see from the picture it is a big module for sure. I still need to calibrate this one and haven’t tested it a much as I would like too. I just needs some time with it to really tell something about it. For more background information be sure to check out Harald’s website. https://www.haraldswerk.de/VCO/Trapezoid_Euro/Trapezoid_Euro.html Difficulty to build: HardHave you seen it size, lots of parts calibration…

This is my goto Bass drum. It was one of my first builds. It’s bassed on a 808 bass drum. Has CV inputs for pitch, decay and distortion. Overall it has a nice sound and it can be distorted. Great for techno bassdrums. http://www.hexinverter.net/mutant-bassdrum Difficulty to build: Medium to hard, has multiple pcb’s and takes some time to build.

After the bass drum I build the hi-hats. These are also based on the 808. I really like the fade switch. This can close the open hi hat when the closed one is hit or can leave it open, or somewhere in between. It has a great effect on the decay of the open hi hat. It takes external noise if you want to. I’m a big fan of this hi-hat. the one think I would change is the panel…

For some people it is the best snare they have. I don’t like this one that much. Maybe I need to do some calibration on it again. I read more diy version are difficult to calibrate. It should be a 808 snare and like the Hihat and bassdrum it is designed on the 808. So don’t know why I don’t really like it but it is what it is. Difficulty to build: Medium to hard, Has multiple pcb’s and can…

This module is a Mutable Instruments Clouds on steroids . I haven’t build this module myself. When Beads came out these came on the second hand market for quite acceptable prices. So I bought one. I’m still figuring out how and when to use it. But I know I really like the reverb on it. It’s build by Lotek_HQ that I could only find a Instragram page of. But the design for the typhoon is done by Jakplugg. I changed…

This is a nice and small ASR module. Normally you would call this a ADSR module but Kassutronics left out the decay part and knob. He uses the ADSR in a way where the decay and release are often set the same. Therefor Kassutronics combined these two under one knob. The ASR can also loop and can be used as a sort of LFO. It’s a nifty little module. Again with the white panel made from wood. I have had…

This was one of my first filers. It’s based on the famous Korg MS 20 design. I believe it’s based on the late design by Korg. I’ve been looking into filter designs a lot lately and this one is really nice. A good description can be found on Kassutronics site: https://kassu2000.blogspot.com/2019/07/ks-20-filter.html He based the filter on a design by René Schmitz. René did a lot of reverse engineering to find out how the filter in the Korg worked. Most of…

Just another 3340 VCO. This chip is used in a lot of VCO these day’s. The CEM3340 chip was achip used in a lot of older synths like the Roland SH-101, the Sequential Prophet 5 (Rev.3) and more. Electricdruid.net has some schematics and more background information on that online https://electricdruid.net/cem3340-vco-voltage-controlled-oscillator-designs/ The CEM3340 VCO chip has been re-released. It has also been cloned by CoolAudio as the V3340 and by Alfa as the AS3340. You can put any of these in…

After DIY-ing a few modules I bought this as my first non DIY eurorack module. I just love MFB and I was in need for a good filter. While this fitted all my needs. Bought it second hand on a pretty good deal. https://youtu.be/kUepRppcW4A (not my video) Difficulty to build: No DIY. Bought it.

This is not a DIY module. Most of my rack is DIY, but I’m a big sucker for anything MFB. I bought this module second hand. It’s my go to bass drum. Punchy, it has a lot of CV options and just my favorite kick/bass drum. They can only be bought second hand because MFB isn’t making them anymore. For some sound demo’s check YouTubehttps://youtu.be/dlGyh8TWp2g (not my video) Difficulty to build: No DIY.

Like the MFB Bassdrum this module can only be bought. The isn’t a DIY version for these 522 modules. I bought this to match the bass drum and really like the sound of this clap module. But then again I’m just a MFB fanboy. Still looking to buy the others in the 522 range. If you have those and want to sell them please let me know. https://youtu.be/8moHTCmufX0 Difficulty to build: No DIY

I bought this LFO mainly because of the reset function. I really enjoy using this LFO in my patches. I think it’s one of the best LFO out there, but hey I’m a MFB fanboy. The switch can be used to trigger the second LFO from the first one. The options this LFO got are missing on a lot of other LFO’s https://youtu.be/OEa18OEaMfI (not my video but some patch tips with this LFO) Difficulty to build: No DIY. Bought it

Many people use this as a master clock module. As I have a few LittleBens in my rack I tend to feed it a external clock and use it as a drum trigger sequencer. It show how many possibles this modules has for a eurorack setup. I was my first clock module before I build my own clock. The only part I didn’t like about this one when using it as a clock was that I could not read the…

I bought this module a few years back. It’s a great digital oscillator with a few trick up it sleeve. It has a Teensy on the back loaded with the firmware. I bought it when it was still made with thruhole parts nowaday it comes as a SMD version. I should still be possible to build by hand. If your looking for a new osccillator be sure to check this one out and not be fooled by being on the…

The doorbell rang today and there was the mailman with a package. The side-chain I posted earlier new revision was in the packages. So I just can not wait to build and test it. Hopefully I don’t have to make another revision. If everything is alright it will be in the shop this weekend or next week or so. Just hope to find the time to build it. After some good feedback on the blank panel there where also some…

Well I can write a lot about this module, but I already did on different parts and topic on this site. I made this module myself based on Hagiwo design. Used his schematic, changed the DAC chip to a thru-hole type and made pcb’s and panel for it. It’s a nice little quantizer with slide function. You can find more information on it on this website. If you want to build your own be sure to check out the shop.…

Another one of my own designs. I was in need for a master clock that would display the BPM and could be adjusted with a knob. There aren’t that many out there that fitted my needs. So I made Littleben. It started out as a simple clock with 4 clock outs and 4 reset outs. Running on a Arduino mini the firmware grew and now it can do a lot more. It can divide clock, calculate a incomming clock and…

open for offers on build modules Another one of my own designs. The original design is made by Mutable Instruments and called Grids. It’s a drum trigger sequencer. When starting into eurorack I started out with a lot of drum modules. But had nothing to trigger them. I designed the Nanogris of the Grids schematics but used all thruhole parts and a Arduino Nano. It was quite the journey. I did some pcb’s design before but this took a while…

I just finished one of these. I found his post by accident on modwiggler. After seeing it I went into a rabbit hole for a few days. This baby is a small Daisy patch and open source. If you don’t know what a Daisy patch is… well these days a lot of modules come out that use a Daisy on the back of them. Daisy is kinda like a Arduino nano but build for audio DSP. This makes it a…

This module I build a few months ago. I’m still experimenting with it. It makes great bassline’s. I don’t know yet if I have calibrated it enough but it sound awesome even without. When I have played enough with it I will surely update this post. But if you are looking for a module that can produce deep basslines, give this one a try.https://www.skullandcircuits.com/big-bass-machine/ Difficulty to build: Hard, because it has a lot of parts.

Another filter based on the LM13700 chip. A lot of filters use this chip and have similair designs. I have to double check the schematics on the skullandcircuits.com but this could be based on the MS 20 design by Korg (didn’t check yet when posting this). It has it’s own sound that’s one reason to put this in your rack. It has lox pass, band pass and high pass outputs that enable mixing them together with a mixer. https://www.skullandcircuits.com/vcf-3/ Difficulty…

Open for offers I love these Braids VCO. The original design is by Mutable Instruments. Soundforce.nl have made it into a THT version with a 12bit DAC. The DAC does sound great for being only 12 bits. It functions like the normal Braids, it even looks the same but is far less hard to build, no SMD parts on this one. It needs a blue pill (Arduino on steroids) . It does requeir some skill to program it. I build…

After building the 3uShop Multiple in my reflow oven I went on a reflowed this module. It’s a dual LFO by ST modular. It’s small and compact with two LFO. It can go pretty fast. Everything depends on the values you choose for the capacitors driving the LFO’s. I like this one because it so small and I can fit it nearly anywhere in between in my rack. The only thing I really hate is the support forum for this…

This is one of the modules I always wanted to have. Just because I have read the book from Thomas Henry before I started on my DIY eurorack journey. This module is designed by Timo Rozendal based on the Thomas Henry design from his book. From the little contact I had with Timo he really seems a nice guy. This module can deliver anything from bassdrum’s to tom sound and anything in between. https://soundcloud.com/timorozendal/demo-of-thomas-henry-bass-module https://www.timorozendal.nl/ Difficulty to build: Easy to…

I started out my eurorack with drum modules. It was more a drum machine then a synth. But when the hexinverters clap failed to startup and the snare wasn’t what I tough it would be I started building other modules. But I found myself always looking for more drum sounds. The snare and clap where missing quite a long time from my setup until Weston released the AD110. This would surely fit my needs for a good clap and snare,…

A bass drum and a bass voice all in one. This one was nice to build I has multiple pcb’s but it’s well ordered. The manual is not the best but also not the worst. I need to use this module more then I do right now. I had it in my rack for a while not calibrated. Took it out just a week ago and did calibrate it. I had some trouble getting the sweet spots maybe it’s better…