Eurorack Power Bus PCB - 18 connectors

The Bus 18 is a high-density power distribution board PCB for Eurorack synthesizers, designed to supply up to 18 modules.

Key Features

• Expanded Connectivity – Four additional connectors compared to the Bus 14, without increasing board size.
• Flexible +5V Supply – Can host an onboard linear regulator for +5V (optional, can be bypassed for PSU-powered +5V).
• Universal Placement – Fits in skiffs, travel cases, or large racks—ideal for high-density systems.
• DIY Friendly – All the components are Through Hole (THT).

Technical Specifications

PCB Dimensions

• Length: 20 cm (7.87″)
• Width: 5 cm (1.97″)

Power Input

The PCB is designed to be equiped with screw terminal connectors (top and bottom)

• Compatible with most Eurorack PSUs
• Allows daisy-chaining multiple buses

3 LED status indicators (one per rail: +12V, -12V, +5V):

• Confirm voltage presence
• Verify correct polarity

Module Connections

18 × 16-pin Eurorack headers

• Keyed design prevents reverse insertion (but always verify!)
• Standard Eurorack cable compatible

+5V Power Options

The Bus 18 supports two methods of supplying +5V to your Eurorack system:

1. Onboard +5V Generation
   The bus board can host a +5V regulator circuit to generate +5V from the +12V rail.
2. External +5V from Your PSU
   If your power supply already provides a +5V rail, you must bypass the onboard regulator and omit these components during assembly:

    

   • The +5V regulator (U1)
   • The two diodes (D4 and D5)
   • The two capacitors (C4 and C5)

   Feed the +5V into either the top or bottom screw terminal (the board accepts it on either side).

The PCB comes with no component.