ATX PSU Dev Board

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ATX PSU Dev Board

Release status: Working

A board to break an ATX power supply connector into terminals.
Creative Commons Attribution-ShareAlike 3.0
CAD Models
External Link

This board is inspired and based on . It has wider traces to carry more current. Source at


  • Fuse1 11A M FR1100
  • Fuse2 5A M FR500
  • Fuse3 5A M FR1100
  • Fuse4 5A M FR500
  • Fuse5 5A M FR500
  • Header Pin1 1X02
  • Header Pin2 1X06
  • LED1 Green LED3MM
  • LED2 Green LED3MM
  • Resistor1 30R 5Watt HPS923
  • Resistor2 22R CA4050
  • Resistor3 1Kohm
  • Resistor4 1Kohm
  • Pad X2 MSTBA10


What's in the box

Bag Layout



The following tools and materials are required to assemble the ATX PSU Dev Board:

  • Soldering Iron
  • Solder
  • Flush/diagonal cutters

Additional tools that might be helpful, but not required:

  • Lead bender (some 3D printable ones can be found online)


If you do not have prior experience soldering, we recommend checking out a few of the following websites for tutorials.



Use attached file to etch File:Atxpsudevboard 0-1b.pdf

Board Orientation

The components of this board will be inserted on the side with the outlines.

Correct Side

Step 1

Begin by inserting the two 1k ohm resistors and the LEDs into the board. The LEDs should have the longest lead in the hole facing the resistor. If they are inserted incorrectly they will not work. This is because they are diodes. Diodes only allow current to flow in one direction. Resistors are not polarized components, so they can be inserted in any orientation.

Step 1

Step 2

Next flip over the board and solder the components in. You may need to slightly bend the leads to prevent the componets from falling out of the board.

Step 2

Step 3

Now that the components are soldered in and secure, you can cut the leads.

Step 3

Step 4

The fuses will be inserted next. They have a coating that slightly descends down the leads as shown below.

Resetable Fuse

In order to make a good connection the fuses should slightly hover over the holes. This is so the coating on the leads does not interfere with soldering. You want to bring the fuse above the board. This can be done with RepRap filament or something else, such as a long screw. The orientation of the fuses does not matter.

Step 4

Step 5

You will need to remove the filament before continuing.

Step 5

Now is a good opportunity to inspect the solder joints. Since the connectors and fuses on this board might carry as much as 10 amps you want a good solder connection. You can check the quality of the solder joint by looking at the other side of the leads. A good connection is shown on the left lead, with a potentially weak one on the right lead. Add some flux and reheat the joint to touch-up the connections if needed.

Solder Joint

Step 6

Next you will want to solder in the remaining resistors. Again, orientation does not matter for resistors.

Step 6

Header Pin Preparation

Next locate the header pins in the parts bag. You will need to break them into a strip of 6 and 2 as shown below. This can be done with flush cutters.

Split header pins

Step 7

Solder the header pins as shown.

Step 7

Step 8

Add the recieving end for the pluggable headers.

Step 8

Step 9

Next you will want to add the ATX connector. It has barbs on the housing that should clip onto the circuit board. Make sure the connector is well seated before soldering.

Step 9

You have now completed assembly of the ATX PSU Dev Board!


In order to turn the power supply on, a jumper between "PS ON" and "GND" must be added. Optionally, this can be connected to a micro controller.

PS_ON Jumper

When an ATX power supply is connected to the board and turned on the "PW OK" and "5V" light will turn on. Otherwise if not turned on but connected, just the "5V" light will be on.

Testing a power supply

Finally you can connect the pluggable headers into the board and power your project!

Pluggable headers inserted


The source for the ATX PSU Dev Board can be found in the UltiMachine repositories on at


Product support inquiries can be directed to [email protected]. In the event there is an error in the documentation or problem with the board, please report the issue to the bug tracker at