Electronic Ghost

This spooky electronic ghost is a 555 LED flasher circuit encapsulated in silicone rubber.

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In BOOlean logic.

stl-binary - 108.09 kB - 01/06/2019 at 12:52


  • 2 × Blue LED
  • 1 × 555 Prototyping Products / PCB Chemicals
  • 3 × 1 kOhm resistor
  • 1 × 10 kOhm resistor
  • 1 × 0.01 uF ceramic capacitor

View all 8 components

  • 1
    Making the ghost shape

    Before soldering the circuit, I 3D printed the shape of the ghost. You can download the stl file from here.

  • 2
    Soldering the circuit

    The schematic is a very simple one which you can find here.

    I cut two holes in the lower part of the ghost shape, in order to solder the battery holder on the outside. This way the silicone didn't get stuck in the battery holder.
  • 3

    Adding the silicone was a bit tricky, because of the air bubbles. I tried heating the ghost hoping the bubbles would rise to the surface, but it didn't work as expected.

View all 4 instructions

Enjoy this project?



Elliot Williams wrote 01/12/2019 at 21:24 point

Tidy project. Horrible pun.

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Mike Szczys wrote 01/08/2019 at 15:16 point

3D printed mold is a really nice touch. Well done!

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Zalmotek wrote 01/09/2019 at 07:42 point

Thank you!

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Lee Wilkins wrote 01/07/2019 at 18:44 point

This looks really cool. Do you have any more info on the silicon process? 

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Zalmotek wrote 01/07/2019 at 19:13 point

Thanks! This was my first attempt at using it. This is the silicone I've used: Not the best choice, but I couldn't find an epoxy one. The one I've used remains elastic after drying and so far it didn't seem to affect the circuit.

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Dan Maloney wrote 01/07/2019 at 16:11 point

BOOlean, lol...

So that silicone you used - I suppose it's not the kind that reeks of acetic acid, right? I've been looking for potting silicone.

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Zalmotek wrote 01/07/2019 at 19:00 point

It is actually, I've read it's not exactly suitable for electronics but it's the only type I could find. This is the one I've used:  

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Amos wrote 01/06/2019 at 13:49 point

Cute idea! 8^)

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Zalmotek wrote 01/06/2019 at 16:00 point

Thanks! :D

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