A simple linear adjustable power supply for modular synthesizers in the Eurorack format.
It's easy to build and outputs more than 1A at +12V, -12V and +5V each.
Eurorack_PSU v0.1.0
I designed this power supply for use in my own modular synthesizer projects. Thought i'd share the board with other synth builders. (Gerber files in the repo can be directly uploaded to your pcb manufacturer of choice. Interactive BOM for easy assembly included.)
DANGER OF DEATH: Do not attempt to build this project if you do not fully know what you are doing!!!
The build requires wiring a transformer to mains voltage, which can easily end in a deadly accident if done incorrectly!
CAUTION: This project is not suited for beginners! Use the files in this repository at your own risk!
If you do know what you are doing and want to build the PSU:
I will do my best to test everything, but the occasional bug might still find its way into the project files. Don't hesitate to report found bugs or share ideas on how to improve the board.
The main branch of this repository holds the current tested version of the board. All potentially breaking changes will be done on the develop branch and the build will be tested before merging. Images in this README do not necessarily show the most recent version of the board, though all images will have version numbers in their title.
- KiCad
- For standard +12V, -12V, +5V power (±15V should also be possible by adjusting the potentiometers but was not yet tested).
-
$\approx 1.3A$ per rail (regulators are rated$1.5A$ abolute maximum) - Three LEDs indicate the rails being powered.
- Little heat generation
- Fuses on both secondary windings
Designed to work with the Eurorack_Bus_Board, but can also be used in conjunction with other bus boards.
M3 screws and PCB spacers can be used to mount the board to the back of a case.
Regular 6.3mm flat connectors are used for connecting to both transformer and bus board.
Use a toroidal transformer with split secondaries at 15VAC and choose one capable of driving enough current to meet your needs!
(Both positive rails are powered by the same transformer winding.)
Both secondary windings of the transformer are connected on one side of the board. Eurorack power is output on the other side.
Use a voltmeter to adjust the individual voltages by turning the trimmer potentiometers. if you wan't to be extra precise you can attach a suitable load resistance and adjust the voltages when drawing the same amount of current your modules would do.
Upload the .zip in the gerber_files/ folder to your PCB manufacturer's website to order.
An interactive HTML BOM is available in the bom/ folder. Just open it in a browser and tick off sourced/placed components.
Also shows where on the board components should be placed.
HINT: Use good quality solder/flux and clean the board thoroughly after soldering!
No unobtainium in this project. All components should be easily sourced, at least in europe.
Feel free to recommend more easily available parts if you can think of any worth replacing.
Any questions?
🡢 contact[at]butchwarns.de
(TODO: Find appropriate open-hardware license!)
Until otherwise stated here, the project is default licensed as proprietary.
Build as many of these boards as you want for personal use, but please make it obvious if your build has modified the project files in any way to avoid confusion!
My name and any logo of mine that might be present on the board design are copyrighted and are not free to use.
You are free to share the images in the pictures/ folder of this repository with correct attribution or a link to the project.
Copr. 2021, Butch Warns