Category: Media

Synthrotek OBEY – DIY Build

Synthrotek OBEY - DIY Build

OBEY - Completed Front

Coming in hot this month is our build of the Synthrotek OBEY eurorack module. This dual-function module is one half envelope follower and one half attenuverter or offset generator.

On one side of the module, the OBEY can take inputs from piezos, guitars, drum machines and even microphones to trigger an envelope or gate into your eurorack system. The other side of the Synthrotek OBEY can attenuvert voltage sources in both positive or negative values (up to 2x times), giving this tiny module some hell of an impact on your performance/recordings.

Born from the Synthrotek nano series of modules, the OBEYs footprint is only 4HP wide. It has 4x LED sliders that control the various two sides of the module. Now, judging by our description, it seems overwhelming and complicated to use. It is not. Synthrotek has provided a lot of documentation and there are several YouTube videos out and about that show the OBEY being utilized.

NOTE: You can access the build docs and the manuals below in our “Quick Links” section below. 

Let’s get on with the build shall we?

Upon unpacking the module, you will notice that it comes with 2x PCBs and 1x panel. Set the smaller of the PCBs aside (it’s the control board that you mount jacks, sliders, etc to) and pick up the logic board. This is where we will start the build process.

fin Divider

Division 6 CEM3340 VCO – DIY Build

Division 6 CEM3340 VCO - DIY Build

Completed CEM3340 Front

Summer is in full swing and we were craving some new oscillators to add to our modular rack. This need was fulfilled by Division 6 labs and Synthrotek with the new Division 6 CEM3340 VCO.

This voltage control oscillator is based off the famous Curtis 3340 IC which has been around for quite some time and have been utilized in many legacy synths.  Our build of the Division 6 CEM3340 was a quick and easy build and is recommended for anyone just getting into modular DIY. 

What is the Curtis 3340 IC?

Many synths today utilize chips that mimic the famous Curtis 3340. While this chip is no longer manufactured in mass volume, there is a few places that still sell the chip. What makes this chip so special is it is a self contained, precision voltage controlled oscillator. 

NoteThe chip used in this kit is not an original Curtis 3340 IC, but it’s damn close!  

It features both exponential and linear control scales and up to four buffered output waveforms. ( triangle, sawtooth, square and pulse). They do not require a temperature compensation resistor because they provide their own compensation. Multiple control voltages can be mixed within itself.  


Rat King Modular GATES – DIY Build

Rat King Modular GATES - Eurorack Modular Build

As summer draws near and the hot weather rolls into California, it’s an optimal time to stay inside and catch up on some DIY modular kits.

When we heard that Rat King Modular was releasing a new module named GATES, we immediately hit up our friends at Synthrotek and ordered one up as soon as the kits were available. (The module had been released as a fully assembled version about a month prior and we were anxious to finally get our hands on the kit version).

Within a few days, the kit arrived and it was time to get busy building the Rat King Modular GATES!

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Completed Gates with Bag

Horstronic Cable Tester – DIY Build

Horstronic Cable Tester - DIY Build

As a DIY modular enthusiast, we are always looking for ways to help improve our efficiency when we are building modules. We recently ran into an issue where upon receiving a modular kit, the power cable wasn’t included. Now, this normally wasn’t a big deal, but it was rather annoying.

With that being said, we decided why not just make cables and sell them to our customers… so thats what we did. We knew that taking this on would be a fun endeavor and we needed to ensure that our cables were fully tested to protect modules from shorting. Finally after scouring the internet for a few hours, we came across the Horstronic Cable Tester.

Horstronic Kit Complete

After reading about the Horstronic Cable Tester over on the Muffs forum  we decided to order one up. There was only one problem though; there were none in stock anywhere. Stock notifications were signed up for everywhere so that we could order one up as soon as it arrived, somewhere.

A couple months had pass and then randomly we received an email that our friends over at SynthCube had a couple kits in stock…


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