If you find your Eurorack modular synthesizer setup becoming too cluttered and the numerous patch cables making it difficult to adjust your knobs, then theres an innovative new solution on the horizon. Meet the Euroknob, a unique control knob that cleverly integrates a concealed patch cable jack, potentially changing the way musicians interact with their equipment.

Initially, when we first encountered the Euroknob demo board, we were somewhat perplexed by its appearance. The design seemed straightforward, resembling nothing more than a standard PCB-mount potentiometer or perhaps an encoder affixed with a knob. As we observed it in action, we saw that twisting the knob would light up a series of LEDs on the board, creating an engaging visual effect. While visually appealing, it didn't seem particularly groundbreaking, especially considering the high standards we expect from the innovative mind behind it, [Mitxela].

However, our perception quickly changed when [Mitxela] demonstrated one of the Euroknob's most surprising features. With a simple twist, he removed the knob from the board, unveiling a 3.5-mm audio jack lurking beneath the surface. This was no ordinary knob; it was cleverly designed to be attached to a mating plug that served as its axle. This ingenious setup transforms the functionality of the knob entirely.

What makes the Euroknob truly remarkable is the technology hidden within it. Beneath the audio jack lies an AS5600 magnetic encoder, a sophisticated sensor that tracks the position of the knob. Additionally, a tiny magnet is embedded in a specially milled slot at the tip of the audio jack. This means that when the knob is placed back into the jack and turned, users gain manual control over their modular synthesizer modules. If they choose to unplug the knob and connect a patch cable instead, they can then send control voltage signals from another module to manipulate their sounds. The design is nothing short of ingenious!

To achieve this mechanical feat, [Mitxela] had to employ a creative engineering solution. He included a spacer board mounted on top of the main PCB, featuring a large cutout that accommodates the sensor chip. This design ensures that the magnet can rotate freely without any obstructions. Additionally, a CH32V003 microcontroller is utilized to manage the encoder and control the LEDs, providing users with real-time feedback on their adjustments.

While the Euroknob is currently just a proof of concept, its potential is undeniably exciting. It stands alongside [Mitxela]s previous innovative projects, such as his fluid-motion simulation pendant and dual-wielding soldering irons, showcasing his commitment to pushing the boundaries of what is possible in electronic music technology. For those interested in modular synthesis, the Euroknob represents a significant advancement that could streamline workflows and enhance creativity.

Check out the demo video below to see the Euroknob in action!