in electronics, PCBs

Hello everyone, I’ve got some good news today!

I released a newer version of my ATX Breakout Board. After receiving a lot of requests, I also printed some PCBs (10x blue, 10x red) and will print more after thorough testing of the current revision.

Features and additions added from the older version:

  • Thickened many traces, removed pin headers in the middle of the board and added one behind each binding post (up to 5 output pins per voltage line, with no risk of burning any traces).
  • Added resistors to the USB ports (on the back of the board). You may want to use them for USB identification, as they are cheaper and easier to find than the TPS2513. Adafruit link for more info:
  • Moved LM317 so that you can mount it horizontally + used a footprint with longpads, should you want to solder wires to an external voltage reg + heatsink.
  • Prototyping area added at the top left of the board. Not sure if it will ever come useful, but I had some empty space there. You have easy access to the 3V3 and 5V lines.
  • Moved/rearranged several parts (pot, switch, LEDs) in order to draw shorter and cleaner traces.

New parts list:

  • C1, C3: 0.1uF 0805 SMD capacitors.
  • C2: 1uF 0805 SMD capacitor.
  • F1, F2, F3, F4: 1812 SMD PTC resettable fuses. (Littelfuse ones should work just fine, I used Bourns instead which are a bit larger).
  • J1: 24-pin ATX connector.
  • JP1, JP2, JP3, JP4, JP5, JP6: 5-pin headers, male or female as you prefer.
  • JP7: 3-pin header (voltmeter output).
  • LED1, LED2, LED3, LED4, LED5, LED6, LED7: 0805 SMDs, choose the color you want but make sure to use appropriate resistors. You may not want full brightness and sure enough you don’t want magic smoke.
  • R1, R3, R4, R5, R7: 3.3K ohm, 0805.
  • R2: 330 ohm, 0805 (value may change – double check LM317 voltages or calculate your own).
  • R8: 10k ohm, 0805.
  • R9: 9/10W power resistor, not needed in my case.
  • R6: 1.2k ohm, 0805.
  • R10, R15: 43k ohm, 0805.
  • R12, R14, R17, R19: 51k ohm, 0805.
  • R11, R16: 75k ohm, 0805.
  • T1, T2, T3, T4, T5, T6: binding posts with 4mm hole. You may want some red ones for the positive lines and a black one for GND.
  • U1: LM-317, through hole.
  • U2: TPS2513 from Texas Instruments. If you don’t have it, install resistors R10-R19 for the same functionality (not both!).
  • VR1: 2k ohm, PCB mount potentiometer, 9mm (click)
  • X1, X2: USB female connectors, through hole.
  • SW1: 8x8mm pushbutton (got mine from Tayda.)

I bought all of my components from Tayda Electronics, except for the ATX connector and the PTC fuses (check Sparkfun or eBay!)

Time for some pictures:

Sexy, aren't they?

Sexy, aren’t they? Also, colors!

The whole batch.

The whole batch.

And here’s a fully assembled one (terrible soldering on fuses and LM317 because I recycled them from a previous build):

An assembled board.

An assembled board.


PCBs will be available in the store and on Tindie soon.



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    • Thanks! I’m happy you like them.

      I uploaded a picture of my assembled unit, but I think female headers would be the better choice.

      • I also prefer female headers, that reduces the possibly accidental short circuit… 😛
        Happened to me with my Arduino, I was afraid it was fried but fortunately it only did a reset.

      • Hello..!!
        please, I would buy a complete ATX Breakout Board (assembled)
        is possible somehow? (i from Spain)
        thanks in advance.

        best regards

  1. Do you have the part number for the potentiometer you use?
    Also, what part did you use for the voltmeter display?
    Do you have an image of the back of the board to help with part location?

    Just waiting for my board to arrive!

  2. Hello Francesco,
    thank you for building such an amazing device.
    Is it possible to buy an assembled product?
    Greetings form Germany,

    • Hello Martin,

      thank you for your interest. Components are coming in 30-40 days. I plan on selling kits as well as assembled units (minus the binding posts, for shipping reasons).

      I will keep you updated and post a new item in the store when available!


  3. Hello Francesco, congratulations for the board, it looks awesome!!
    How is it working ?
    Im from Brazil and starting a project with old ATX PSU´s.
    In my case I would need to change those bottom pins 3v3, 5v GND 12v ADJ. Probably with more USB´s(on the same voltages 3v, 5v). I think it could improve the board usefullness, to the sky!!! 🙂
    Do you think it will require too much changes on your layout to add those extra USB´s ?
    I will leave my email, if you could give me some help or discuss more of it, would be nice, please contact! Cheers.

  4. Hi Francesco,

    I received your board recently and am now looking to source the parts. What are the values for R13 and R18?

    Thanks in advance

  5. Could this be made in to an ultimate breakout that would feature a 3d-printable case, a static place for voltage monitoring and a voltage range of 1-35V?


  • Building a better breakout board for ATX PSUs. – Francesco Truzzi June 28, 2017

    […] UPDATE: PCBs of the new version have arrived. Blog post and store […]

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