Building a better breakout board for ATX PSUs


Francesco Truzzi made a ATX Breakout board clone:

These are the features I packed into it

  • It has a 24-pin ATX connector
  • Voltage lines are all broken out individually on binding posts
  • LM317-based voltage regulator. Using a 300 ohm resistor and a 2K ohm potentiometer, voltage range is 1.25-9V
  • 2 USB ports based on the TPS2513 from Texas Instruments. They can automatically detect what device is connected and adjust resistance on D+ and D- lines as needed. This means full compatibility and maximum charging speed on both Apple and Android devices. One of them is connected to 5v_STDBY, so that it works even when the PSU is off
  • Pretty much everything can be fused. I left -12V out because it can only carry low amounts of current on most PSUs (mine is 500mA maximum)
  • Breadboard pin headers so that voltage lines can be connected to a breadboard using jumper cables
  • Voltmeter headers in order to know the LM317 output voltage
  • There is room for a 9W power resistor is your PSU needs it to stabilize output voltages. You can connect it either to the 5v rail or to the 12v one by jumpering the corresponding pads
  • Status LEDs on fused lines and USBs so you can check if everything works fine
  • Screw holes for standoffs
  • Breaking Bad art because yeah, this is science, bitch

You can get a ATX breakout board bench power supply for $14 at Seeed Studio.

Join the Conversation


  1. Beautiful work! I love it as is, but it would’ve been nice had it been designed to be mounted in a project box of some sort, but with 3d printing I’m sure I can make something that still does the job.

  2. That link in the bottom is quite misleading, that is for the original, not the one mentioned in this article..

    1. I see nothing misleading. One is a clone, one is the original. It’s clear as day. Turn down the sensitivity dial…

      1. sensitive what?
        I was hoping that i could buy it on that link, I have the original, but this one have some features that I really like, luckily it seems that the maker might have some pcb’s for sale at his site.

      2. Ha ha, okay the ‘clone’ bit is a bit rich. Problem is, DP uses this page template all the time, likes it too much, some of us are too used to this page template…

  3. Hi guys and thanks for reblogging!

    While I made these boards just for myself (10 was the minimum quantity), the response from the community has been great. Many people have emailed me already and I still have to read and reply to them but I don’t think there are any PCBs still available.

    While I didn’t earn anything from selling those PCBs (shipping from Italy is 2.50-4€ depending on where you are from), this has been an unvaluable learning experience and I was able to cover the manufacturing costs.

    I’m considering making another revision, without the bugs of the first one and some added features.

    Stay tuned!


    1. You can either take the Eagle files and get the boards made through one of the regular board fabs, or you could send an email to Francesco, the link is above and written on his board. It may be that he’s making another batch, I don’t know, you’d need to ask him.

Leave a comment

Your email address will not be published. Required fields are marked *

Notify me of followup comments via e-mail. You can also subscribe without commenting.