Category: Products

Synthrotek TURN Eurorack Module DIY Build

Synthrotek TURN - Power Management Module DIY Build

Synthrotek TURN - Instagram photoAre you having power issues with your Eurorack system?  Do you ever experience flashing lights of doom when you power on your system? The Synthrotek TURN might have you covered!

Let’s face it … rack systems draw and use a lot of power. Whether this be on start up or whether it be through a sustained time period (during recording, tinkering, performing, etc). Much like the Windows screen of death or the Mac spinning rainbow wheel; rapid blinking lights or no lights upon startup of a rack system can be VERY stressful. This is something that we can all face from time to time and trying to find the source of the issue can be a real task. Things like flipped power cables, bad solder joints and overloaded power rails can all be culprits. With all of these potential issues causing power draws, the gang out at Synthrotek have come up with a solution to tackle power management upon startup. Introducing the Synthrotek TURN.

We were one of the many that were having startup issues from time to time and spent countless hours going through and testing each module/cable only to find that nothing was wrong with our rack. We emailed Synthrotek and come to find out the Synthrotek TURN was under development. Upon its release, we picked one up and decided to take on the build. With all that being said, lets get onto the build…

Synthrotek TURN - Time Lapse Build

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A relatively inexpensive module; the TURN can be a headache saver. The build itself was also a painless task for anyone with a small level of soldering knowledge. During our build which lasted roughly 30-45 min (a little longer because we had a dirty iron…which we had to clean), we used two different sizes of solder for the various connectors and jacks. With all resistors, we used a smaller gauge wire (0.4mm) and a slightly larger gauge solder for jacks and knobs (0.8mm). With only two resistors, 2 LEDs, 2 switches and 4 molex adapters, we were finished before we knew it.

Upon completion, we quickly placed the TURN into our performance case and instantly powered on the main power. Toggled a switch and the next set up modules powered up. It was flawless and provided us with some peace of mind with regard to over amping the system. One thing to note is that the Synthrotek TURN can be used with Synthrotek power/bus boards via the supplied Molex cables or 3rd party power/bus boards via Molex adapter cables, adding more versatility to the TURNS already usefulness. Hands down, this is a must have for any rack.

Synthrotek TURN - Build Gallery

Synthrotek TURN - Module Specifications

TURN Detailed Features:
Module width: 4HP

Module depth: 50mm (with cables plugged in)

Max current draw: 8mA

Synthrotek TURN - Additional Information

BONUS: If you are in the need of saving valuable HP, you can install the TURN switches in the side of your case! The TURN can be purchased as a PCB without a panel; when mounting into your case, the LEDs and standoffs are not needed, so only two holes are necessary (for the switches). This is pretty rad!

Supplemental Photos and Wiring Diagrams

If you have any questions about the build process or if you would like to send us suggestions, please feel free to contact us!

~ f i N

4MS Atoner Eurorack Module DIY Build

4MS Atoner Eurorack Module - DIY Build

For our latest eurorack build, we take on the mystical Atoner by 4MS Company. This little beast is only available as a kit that can either be ordered from 4MS directly or through other DIY module shops. We picked up ours from the gang out at SynthCube and dove right into the build.

As for the build itself, it was relatively straight forward thanks to the extensive BOM and assembly guide that were provided with the 4MS Atoner kit. Where the build can wonder into the intermediate build category is with the tight ground wiring and navigation of confined spaces (see photos). With that being said, make sure your iron is clean and primed correctly as you don’t want to go into this build with a dirty iron or a dull tip. As for aesthetics, we loved the graphic design on the panel but didn’t care for the knobs that were supplied with the kit. They looked like generic cheap knock off Davies clones, so we chose our own orange Davies Clones to give our 4MS Atoner a little more flavor.

4MS Atoner - Time Lapse Build Video

So what exactly is the 4MS Atoner and what can it do for your rack? According to the companies website the 4MS Atoner is a “unique and versatile device used for creating quantized melodies tuned to an input frequency”. It can also generate poly-rhythmic clock and trigger outputs and be also used as a pitch shifting module based on harmonics. The companies site also goes on to state that it is used for “general mischief and mayhem” which from what we have experienced with it, is true.

4MS Atoner - Build Gallery

4MS Atoner - Features and Specifications

Features of the 4MS Atoner according to the website:
“Harmonics are extracted from an on-board oscillator or external audio signal and outputed as audio or clock pulses. The Position knob sets the cut-off frequency, under which all frequencies will be stepped downwards along a harmonic sequence (octaves, 5ths, 3rds, etc) all the way to sub-audible clicking sounds. Thus, a scale or clock signal can be generated from a single tone.

Two CV inputs and their respective +/- Vary Amount knobs modulate the Position cut-off. The mix of the two CV inputs plus the Position knob is outputted on a CV jack, and another CV output jack provides a steady +10V clock pulse that is jumper-selectable to be a clock division of the audio output (/1, /2, /32, /64, or non-linear division).”

Module Details:
Manufactured by: 4MS
Model: Atoner
Type: Frequency extractor+clock/rhythm generator

Power Draw: 60mA
Depth: 34mm (1.33″)
Height: 3U
Width: 16HP

4MS Atoner - Audio Samples

Additional Build Notes

At first glance and first use, the module can seem very overwhelming, but thanks to 4MS, they have also created a very detailed little cheat sheet for you to start out with. You can view it by clicking here

We look forward to spending more time with our 4MS Atoner and plan on putting it to vast use with our current rack setups.

If you have any questions about the build process or if you would like to send us your comments or suggestions, please feel free to contact us.

~ f i N


Fonitronik Ps3100 Triple Vactrol Resonator – Time Lapse Build

Fonitronik Ps3100 Triple Vactrol Resonator - Time Lapse Build

In our latest build we take on the Fonitronik Ps3100 Triple Vactrol Resonator – A clone of the lovely triple resonator from the rare 1977 Korg Ps3100 polyphonic modular.

What we have here is basically a module combining three bandpass filters (vactrol based filter core from the PS3100) with a simple resettable LFO and some clever CV and signal routing.  The LFO is normalized to the common CV input, which is normalized to the 3 single CV inputs. the 3rd CV channel can be inverted.

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The build itself was a timely one and it took great patience and a skillful hand to complete.  As they stated in the description “Not for the beginner”, remained true.  We don’t recommend this kit to anyone just getting started in the Eurorack DIY realm as it can easily be overwhelming and a simple soldering mistake can cause feelings of anxiety and let down. 

Now, if you successfully complete the module as we did, the module itself can be a prize possession in your rack.  The triple vactrols do exactly what they say they will do and resonate some of the warmest sounds from the 1970’s.  Hence, another reason why this module is special.  The warmth of the analog audio is something that is rare to find in today’s Eurorack systems.  

If you are down for a challenge and are needing some much provided warmth in your rack, this might just be the perfect module for you!

Fonitronik Ps3100 Triple Vactrol Resonator Specifications:

Module Description:

– 3 single audio inputs + a common audio input,

– 3 single audio outputs + sum audio output

– 3 single CV inputs with attenuators + a common CV input

– LFO output, LFO reset input

Module Dimensions:

Height – 3U

Width – 20HP

If you have comments or questions about the Fonitronik Ps3100 Triple Vactrol Resonator, please feel free to contact us!

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