News and Builds

Evaton Technologies AModulator – DIY Build

Evaton Technologies AModulator - DIY Build

The Evaton Technologies AModulator SDIY kit is a companion module to the RF Nomad voltage-controlled shortwave receiver. What does that mean though?

In crude form the AModulator is a RF amplitude modulator that produces a micro-power radio-frequency signal which the RF Nomad can decode. 

Still not making sense? It’s ok, it didn’t make sense to us until we dove a little more into this sidecar module. 

Simply put, the AModulator allows you to encode any audio signal into an amplitude modulated RF signal, which the RF Nomad can then decode back to audio, with all the artifacts of vintage shortwave sound.

The AModulator SDIY kit consists of two printed circuit boards and thru hole components required to complete the kit. One circuit board contains the actual electronics of the module, and the other circuit board serves as both the faceplate of the module, as well as a touch-plate antenna. 


Neutral Labs NERMAL – DIY Build

Neutral Labs NERMAL - DIY Build

In the world of modular synthesis, there are many companies that offer distortion modules, but few of them really stand out. The Neutral Labs NERMAL is a destructive 3 layer distortion module that is able to modulate frequencies in the audio range to produce some rather unexpected harmonics. 

Known primarily for the desktop synth ELMYRA, the NERMAL is Neutral Labs first stab at eurorack and from what we can tell, it won’t be their last. We were anxious to get our hands on this build and learn all about its unique abilities. 

The Kit and where to get it (in the U.S.)

After seeing a few demos of the NERMAL, we knew we had to track one down. We ordered up from our friends over at Synthcube and within a few days it arrived safe and sound. Upon cracking the box open we were shocked to see the care in separating the components into “sections” or smaller packaging.

Neutral Labs really made it easy to keep the parts from getting all mixed up. They even state on their build document that one needs to go through one bag of parts at a time so that you won’t lose parts or have to double check resistor values. This was pretty rad that they were thinking of the builder.


Erica Synths SWAMP – DIY Build

Erica Synths SWAMP - DIY Build

The Erica Synths SWAMP is a random CV and audio generator inspired by the famous Wiard Wogglebug module; it’s often the heart of self-generating patches and brings controllable randomness to any modular system.

Synthrotek did the world of DIY builders a solid by putting together these hard to find discontinued kits, and we have been wanting to get our hands on the SWAMP for a long time…and now you can too!

Purchase Quick Links: 

Erica Synths SWAMP – DIY KIT

Erica Synths SWAMP – Fully Assembled

Erica Synths SWAMP – Panel/PCB/IC

Before hoping straight into the build, let’s take a step back and highlight what separates this module from the original Wobblebug. 

The Erica Synths SWAMP module introduced numerous modifications and improvements to extend the potentiometer range. It added an audio input, which, when connected, replaced the internal Tone oscillator, and the expensive dual vactrol.

The S&H (sample and hold) circuit was build around the Riga S&H IC (AS1100CK2) and ES added audio waveform selection switches, CV output configuration jumpers and much more. All of these are reasons to have just one in your rack!

To sum everything up, the Erica Synths SWAMP is an advanced multi-level kit that can pose a few challenges for even the experienced builder. Packed and distributed by Synthrotek, the entire DIY line of modules is now available for you to take on! (so we had to)


Erica Synths Dual VCA II – DIY Build

Erica Synths Dual VCA II - DIY Build

Completed Rear - Dual VCA II

On with the build....

Fresh off the build table comes Erica Synths Dual VCA II. The module itself is apart of the open source DIY kits that are available via the Erica Synths Github.

Our friends over at Synthrotek have painstakingly taken it upon themselves to part out these kits and package them up to make them accessible by all DIY enthusiasts. VCA’s or voltage controlled amplifiers are modules that every rack contains.

This module is a Polivoks-inspired VCA that is 35mm deep, skiff friendly, has solid mechanical construction and doesn’t require wiring.  Who could pass this one up? We couldn’t! 

In the end, the Erica Synths Dual VCA II is like all other kits in that the BOM is comprised of the basics … resistors, diodes, capacitors, pots and jacks. There might be a few other surprise components in there, but all in all, these are what make up the kit.

Start by laying out all of the components and the x3 boards. This kit contains a control board and a logic board so you will be going back and forth between the two boards when placing components. Resistors, diodes and ferrite beads are first up.

Diodes have polarity so prior to tacking these down, you have to make sure they are placed in the correct orientation. We used top down soldering to make quick work of these.