Tag: module

Reverse Landfill Pentamix – DIY Build

Reverse Landfill Pentamix - DIY Build

Reverse Landfill’s unique approach to modular synthesis is something that they are becoming known for. Their cryptic silkscreens on their panels also makes for some interesting patching if one is unfamiliar with the modules. The Pentamix is one of Martijn’s newer modules that helps bring all of the other Reverse Landfill modules together.

A 5-channel audio mixer, the Pentamix’s real magic happens when you patch the inverted output and use the another output to send out to an effect and then back again into the Pentamix.

With its 555 pentagram, this mixer brings a new dimension to ones rack… but enough about the module, let’s get onto the build… 

Resistors and Diodes...

Start with the resistors on this build. There are not very many of them (12 to be exact) and their polarity doesn’t matter. Each resistor set is marked so its easy to figure out what goes where if you can read a BOM.  You can find all of the Pentamix’s documentation on the Reverse Landfill website for quick reference. 

Diodes are next and one thing we love about Martijn’s modules is the extra power protection. The diodes (x2) will protect your module if the power is reversed for any reason. The 2x resistors next to the diodes are there for extra protection. One thing to know about diodes is that their polarity does matter. You want to be sure that the black line on the diode lines up with the silkscreen on the PCB. A quick tack down of these and its time to move onto the IC sockets and caps. 


Waveform Magazine Catwalk – DIY Builds

Waveform Magazine Project 4 - Catwalk - DIY Build

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Catwalk - Project 4 - Arrival

As the latest Waveform Magazine hit both the digital and home mailboxes, we were anxious to see the gang had come up with for their latest DIY module. We had the opportunity to build, review and share all of the previous Waveform Magazine projects in previous months and needless to say our curiosity was struck by the new packaging of Project 3 – The Switchenator.

As you can see in our Switchenator build photos, the header card/packaging of the module listed all 3 of the previous projects (PT2399 Delay, Gateway Oscillator and The Switchenator)… but the card had another listing. What could the Catwalk be? Was the Catwalk the notorious “Project 4”? Could this be a clue to the next module or DIY project this amazing magazine has developed? The simple answer is yes! Ladies and gentlemen, Waveform Magazine has presented us with Project 4 – The Catwalk.

The Catwalk? What the?….


Waveform Magazine PT2399 Delay – DIY Build

Waveform Magazine Project 1 - PT2399 Delay Module - DIY Build

When it was announced that there would be a magazine dedicated to modular synthesis, you can imagine the feedback from the modular community. Waveform Magazine was born in the summer of 2019 and upon its release it created a following.

To much of everyones surprise, not only was this a magazine that reviewed modules, manufacturers, artists, etc.. it also contained its very own DIY projects.

Project #1 was a upcycled karaoke reverb PCB that would be transformed into a eurorack delay. Otherwise known as the PT2399 Delay or Waveform Magazine Project #1, this little 5HP module inspired a whole new group of DIYers due to its new found glory of being published.

Waveform Magazine PT2399 Delay Module

PT23.. what?

At the heart of Waveform Magazine Project #1 is the PT2399 chip. The PT2399 is a CMOS echo/delay processor developed by Princeton Technology Corp.

This digital chip includes an ADC (Analog to Digital converter), 44Kb of RAM to store the samples and a DAC (Digital to Analog converter). This chip was created as a simple solution to add delay/reverb/echo to karaokes and set-up entertainment systems. Pretty rad eh?

The PT2399 is readily available and has a minimum delay of 30ms and a maximum of 340ms (that could be extended up to 1 second at the expense of sound quality) which makes it perfect for delay, echo and reverb effects.

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Waveform Magazine Switchenator – DIY Build

Waveform Magazine Project 3 - The Switchenator - DIY Build

Front Completed Switchenator

Issue 3 of Waveform Magazine (Winter 2020) is chock full of reviews, interviews, gear and even a new DIY Project. For their third DIY project, Waveform have provided us with another utility module that requires zero power and allows attenuation and signal toggling on the fly.

Waveform Magazine Project 3 is known as the one and only Switchenator!

We were thankful to take this build on and see what this module was all about!

To sum it up, the Switchenator is a dual passive attenuator and dual switch for Eurorack systems…. and it’s a little 4HP beast.

What’s this Waveform Magazine again?

Waveform logo yellow

As previously mentioned in our Gateway Oscilloscope write up, Waveform Magazine is the first and only publication dedicated to modular synths. With that being said, we were stoked to receive the Winter 2020 edition of Waveform earlier this month partially due to all of the new gear reviews and industry news that they provide.

One of our favorite features is interviews with the modular synth manufacturers. It’s really cool to get to read about their journeys into modular synthesis and how they started their businesses. The interviews are so well written, it almost makes it feel like you know the owner of the modular company upon completing the article.

Note: In case you missed the opportunity to get the first three issues of Waveform, you can still pick them up over at the Waveform site (which we HIGHLY recommend you do!)


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