DIY PCB exposure box looks professionally made


[Stynus] was frustrated with the fact that he would have to flip his PCBs over mid way through the exposure process, so he decided the best course of action would be to build his own double-sided PCB exposure box.

He scored some UV LEDs on eBay, and after waiting a few weeks for PCBs to arrive, he was ready to start construction. The box contains a sliding glass shelf, which is positioned between two sets of LED panels. The setup lets him simultaneously etch both sides of any PCB, up to 20cm x 30cm in size. The exposure box is run by a PIC 16F628P and features an LCD status panel as well as a small handful of controls. [Stynus] programmed the box to retain the length of the last exposure, making it easy to replicate his results time after time.

Towards the end of the build log he shows off some pictures of the completed exposure box, which looks very professionally done. It’s a great job all around, and we would gladly take one for our workshop in a heartbeat.


  1. kabadisha says:

    Nice job!

    This is just the kind of thing your average Hackaday reader loves to see, a useful tool that you could make yourself for your workshop.

    Keep them coming :-)

  2. ahWellYouSee says:

    A friend once told me that all glass naturally provides some amount of UV absorption. Was he right? If he was, I’m making mine with a carrier ;)

  3. Bogdan says:

    Some glass lets UV pass, some doesn’t.

    All in all, it’s a great job done!

  4. Truth says:

    physicist Richard Feynman claimed to be the only person to see the explosion without the dark glasses provided, relying on a truck windshield to screen out harmful ultraviolet wavelengths –

  5. S says:

    An hexagonal LED pattern would have provided a more uniform light density.

  6. TheCapt says:

    Maybe silly question, but why does he need the upper glass? Does he need to protect the UV LEDs from board off gassing or something?

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