How to power Eurorack modules?

How to power Eurorack modules?

1- A Comprehensive Guide to Powering Your Eurorack Modules:

Eurorack modular synthesis offers an expansive universe of sonic possibilities, allowing musicians and sound designers to craft unique sounds and textures. However, amidst the excitement of assembling your dream modular system, it's crucial not to overlook the fundamental aspect of powering your Eurorack modules. In this guide, we'll walk you through everything you need to know to ensure that your modules receive the proper power supply for optimal performance and longevity.


2- Understanding Power Requirements:

Before diving into the intricacies of powering your Eurorack modules, it's essential to understand their power requirements. Most Eurorack modules operate on standardized power rails, typically +12V, -12V, and sometimes +5V. Each module will specify its voltage and current requirements, which you'll need to consider when selecting a power supply.

You can recreate your system on to easily calculate the total power consumption.


3- Choosing the Right Power Supply:

Selecting a suitable power supply is the foundation of a stable and reliable Eurorack system. Power supplies come in various form factors and power ratings, so it's crucial to choose one that can meet the demands of your modules. Consider factors such as total power output, number of power rails (including 5V rail or not), and compatibility with your Eurorack case.


Common formats:

  • Bus board with on-board power supply [example]
  • Modules often in 4hp (ideal for small cases) [example]
  • Mains voltage transformer (ideal for big systems) [example]


4- Installing the Power Supply:

Once you've chosen a power supply, follow the manufacturer's instructions to install it in your Eurorack case. Ensure that the power supply is securely mounted and connected to a reliable power source, such as a grounded outlet.

Proper installation is key to ensuring safe and stable power distribution to your modules.


5- Bus Boards:

 After the power supply is installed we need to distribute the power to the modules, for this we need a bus board, that gets fixed inside the case, or a “flying Bus cable” to connect the Power supply to the standard Eurorack Power cables.

When searching for bus boards, keep in mind the total number of connections you need, and the width of your case or space available inside the case.


6- Connecting Power Cables:

With the power supply and bus board in place, it's time to connect your modules using Eurorack power cables. These cables typically feature standard connectors, such as 10-pin or 16-pin headers, which plug into the power distribution board on your modules. Pay close attention to the polarity and orientation of the connectors to avoid damaging your modules.



7- Troubleshooting:

If you encounter any issues with power distribution or module performance, don't panic. Double-check your connections, ensuring that all cables are securely plugged in and that the polarity is correct. Verify that your modules are receiving the proper voltage and current, and consider consulting with experts or online communities for additional assistance.



Properly powering your Eurorack modules is essential for unlocking their full potential and ensuring long-term reliability. By understanding power requirements, choosing the right power supply, and following best practices for installation and connection, you can create a stable and efficient Eurorack system that inspires endless exploration.

Happy patching!

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