Mini flux capacitor prop PCB

Design of a small PCB prop simulating the flux capacitor from Back to the Future

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Inspired by the project of @davedarko #FLUX capacitor trinket I wanted to design my own PCB of the flux capacitor from Back to the Future with 0805 LEDs, a resistor for each LED and the switch and battery holder I have available. Moreover, I wanted to place more silkscreen art on the back of the PCB. Thanks again to @davedarko for the project idea, and for the front design of the PCB!


Zip Archive - 105.88 kB - 08/19/2018 at 15:09



Arduino code for ATtiny13A

ino - 737.00 bytes - 03/02/2018 at 22:36



PDF of schematic in KiCad. Resistor arrays are drawn a bit messy, but it works.

Adobe Portable Document Format - 62.66 kB - 08/11/2017 at 21:53


  • 12 × Yellow 0805 LEDs
  • 1 × ATtiny13A-SU Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
  • 3 × Resistor array (4x0603) 150 Ω
  • 1 × SMD push button
  • 1 × 100 nF 0805 ceramic capacitor

View all 7 components

  • Design files available! Make your own!

    Bastiaan03/02/2018 at 22:50 0 comments

    It took a while, but I just fixed the mistake from the first revision board and have uploaded the Gerbers and firmware here on the project page. It should be enough to make your own. If you do please share it with me!

    Of course I haven't tested this revision, so proceed on your own risk. However the only thing I changed is the pad mask clearance so there shouldn't be an issue.

  • Assembly done!

    Bastiaan08/11/2017 at 17:09 6 comments

    One board is completely assembled, and I've written code to have the lights blink to mimic the flux capacitor animation. The button is not doing anything at the moment, but I'm planning to use it to turn the LEDs on and off, or enable some other kind of animation. 

    The LEDs are quite bright in daylight and have a warm yellow/orange color.

    Here are some pictures of the assembled board:

  • PCBs are in!

    Bastiaan07/28/2017 at 13:30 10 comments

    The PCBs from @oshpark are in and they look great. Attached some pictures of all boards and some close-ups. Time to start soldering soon!

  • PCBs ordered

    Bastiaan07/13/2017 at 22:11 0 comments

    The PCBs are ordered at OSHPark, after all footprints of the components were checked when those came in.

View all 4 project logs

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Pops wrote 10/13/2020 at 20:47 point

Unless you plan to start selling these, can you please post the design files?  An on/off switch is one thing I'd like to see. 
Thanks for the update, its great.

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Matthew Switlik wrote 03/25/2019 at 13:46 point

Great project! This is going to look great with some epoxy putty as a table top objective marker.

I got mine assembled and programmed. I followed this guide but changed the BOD setting to 2.7V.

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cmjenkins1976 wrote 08/31/2017 at 00:03 point

Love your design, any chance to get an oshpark share or Kicad file?  I'd love to put together a few for friends and family! 

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Karsten wrote 08/28/2017 at 22:32 point

I like your design very much - can you share share this project on OSH Park, so that it is possible to order your PCB or can you attach the KiCad files? ;)

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bashNinja wrote 08/12/2017 at 00:13 point

This is awesome. I love it. I think I'd like to build this! Any suggestions before I go trekking on my own?

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Bastiaan wrote 08/12/2017 at 08:15 point

Thanks, I'd love to see others' ideas on it. I laid out the board twice since I wanted to use as little space as possible so take care with that. Also a slide switch on the battery power like @davedarko used is a great idea.

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Craig Kovatch wrote 08/11/2017 at 15:42 point

These boards don't work on water, so how do you get POWAAAAAAA?

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davedarko wrote 07/13/2017 at 22:25 point

nice :) almost didn't see that (the profile links aren't linked). #FLUX capacitor trinket - I've emancipated the flux board with some changes (battery holder and clip) and will add a link to your project :) Side note: some of the OSHPark board manufacturers seem to render the white line on the front differently, btw. (as can be seen on the project boards) 

Happy Hacking :)

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Bastiaan wrote 07/13/2017 at 22:35 point

Thanks! It's the first project I published here so I'm still figuring out how to link everything. I'll look at linking directly to your project, it should be possible :)

That silkscreen issue is weird, the preview of the board on your OSHPark project does look normal, wonder what caused that. I'll see soon how it turned out when the boards come in!

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davedarko wrote 07/13/2017 at 23:10 point

Hehe - thanks for the linking :) 

Good luck with the order - just don't order after midnight, boards are like gremlins -  I've seen it way too often ;) the first and second version came home as expected, so it was kind of weird that it got back differently in the 3rd version, without having changed something. Ah well. Next version will have a polygon on tNames then. 

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