Tag: Eurorack Module

Erica Synths Polivoks VCO – DIY Build

Erica Synths Polivoks VCO - DIY Build

ES VCO - Boards 1

Erica Synths have been around for awhile and while most of their previous offerings in the modular world were fully built modules, they do have some DIY kits. The Erica Synths Polivoks VCO or Voltage Controlled Oscillator is one of those modules. 

The core of this VCO is borrowed from the famous Russian synth Polivoks VCO, and original matched transistor IC is the same of that was used in Polivoks. These two things give this VCO a very well rounded and beefy sound. (We liked it so much we have 2 of these). 

The gang over at Synthrotek have made these kits available in all their entirety. They have several options available to purchase (links below), including a fully assembled module if you do not feel like building anything. We opted for the full DIY Kit as usual and began warming up or irons!


Synthrotek Crossfader (CF) and 2hp Buff Mult – DIY Builds

Synthrotek Crossfader (CF) and 2hp Buff Mult - DIY Builds

In December 2021, we highlighted a few smaller modules produced by Synthrotek. These modules included the Power Pak, Adapt 1/4 and a Stereo Buffered Mult. The new Crossfader Module (CF) and the new Buffered Mult from Synthrotek are two new modules that join their line of utility modules and we had the opportunity to put them on the build table. 

Just like the previous utility modules, the Crossfader module is a quick and easy build. There are very few hole-through components to complete the module. The Buffered Mult on the other hand, has SMD components and requires finesse when assembling. A novice builder would want to steer away from the SMD soldering until they have had some practice. 

One thing remains true about both of these modules though. Being that both of these modules have a very small footprint in your rack, it is a no-brainer on why they both are“must haves”. Let’s get on with the builds. 

Synthrotek Logo

Synthrotek AstroNoise – DIY Build

Synthrotek AstroNoise - DIY Build

Inspired by 80’s chip tune drum machines, the Synthrotek AstroNoise contains 3 different vintage tones that can give your track something its been missing. Originally released as a DIY project for Knobcon, the AstroNoise came into the world of modular last year in all of its nostalgic glory.

Since we could not make it to Knobcon 2021, we were thankful that this kit made it into the wild. Let’s get on with the build!

The Build...

Upon cracking open the kit, the novice builder could be overwhelmed by the number of things going on. Multiple ICs, bags of LEDs and switches and pots that are not labeled. Synthrotek includes the BOM with their kit and it also available online if that is easier to access. This is essential in building this kit, as well as having a way to test resistors in case any of them got shuffled in the packing or shipping. First things first; start by separating everything (make sure to keep the LEDs in their bags until you get to that part of the build)


Waveform Magazine The Sound of Mewsic (Project 7) – DIY Build

Waveform Magazine Mewsic Box (Project 6) - DIY Build

Sound of Mewsic - Kit

Have you ever found yourself wanting to hear a quick sample of a new module or have your speaker for your “on-the-go” case? Well, the Sound of Mewsic module from Waveform Magazine is exactly what you need. 

(You are probably asking yourself … What is it?) 

It is a small and versatile 10hp speaker module that is a quick and easy build even for the novice builders. For our latest build, we take on Waveform Magazines DIY Project 7… the Sound of Mewsic!

Consisting of a panel, speaker, a pot, a single jack, a tiny PCB and a few other components, the Sound of Mewsic took about 20-30min to complete. 

Let's get on with the build already.... the PCB

Start by placing the power header on the backside of the PCB and tacking it down, making sure you line the notch up with the silkscreen.  Next, place the potentiometer and the audio jack on the topside of the PCB and carefully flip the board over to solder everything into place. Attach the completed PCB to the panel by the jack nut.