Adjustable Tesla coil build

This coil has no trouble shooting sparks across four meters of empty air. [Finn Hammer] has been putting in some long hours on this labor of love, and we put in some time reading through his progress thread. He started down this path about a year ago and every step of the way he produces beautiful work. We enjoy seeing his prototyping techniques, moving from concept to hand drawing to CAD diagram before starting the physical build. Check out the demo video after the break and as you read through his thread look for the green arrows that lead to other videos and resources.

4-meter sparks

How the coil is tuned during use

Demonstration of real-time coil tuning

[Thanks Bill]


  1. HP says:

    Nice job!
    Are we going to see it playing music soon?

  2. Anon says:


  3. Very clean looking & great job with the hardware! I’d love to do a Tesla coil, but I can’t figure out any practical use for it…

  4. andres says:


    practical use? pfft, do it for fun.

  5. fotoflojoe says:

    Personally, Tesla coils do nothing for me.


    I have great deal of admiration for a well designed, well built machine, and completely understand how these things could be an addictive time-sink for some.

    Nice job!

  6. AKA the A says:


    Super electric fence?
    It sure would make the burglars think twice before attempting to break and enter…

  7. biozz says:

    there are far better SSTCs and DRSSTC out there that you could have shown with far better instructions and far easier to read
    try this

  8. therian says:

    “Very clean looking & great job with the hardware! I’d love to do a Tesla coil, but I can’t figure out any practical use for it…”

    Tesla coils are very sensitive to objects and people around, even tiny Teslas make great proximity sensor

  9. t&p says:

    I don’t know why tesla coils are so popular. They were invented by a mad scientist. They do nothing other then to through away allot of electricity up in the air along with your bill to pay for an expensive light show.

  10. biozz says:

    tesla invented the radio AC current the electric motor the electric generator the air turbine and so much that’s around us tesla is not some mad scientist and i suggest you pay more attention in history class before you go trolling around on here

  11. biozz says:

    oh and another thing T&P … the tesla coil was built to send free wireless electricity any ware in the world … and the concept worked when he lit up a light bulb form 1.5 miles away using a small coil (small compared to his plan) and he invented the florescent bulb

    so thank tesla for everything that you have

  12. Kernavel says:

    HAHA! Pwn!

  13. supershwa says:


    Border Patrol

  14. Kuhltwo says:

    Not to mention Tesla holding quite a few patents, including the electrical equipment inside the Niagra Falls power stationand the “poly phase” electrical motor. Edison absolutely hated Tesla.

  15. andres says:

    ah shit, edison vs. Tesla flame war about to start *grabs popcorn*

  16. JJ says:


    If it wasnt for that mad scientist, All your power and appliances would be running on inefficient DC instead of AC, transformers, alternators, and induction motors wouldnt exist, etc. etc. etc.
    Tesla was a MUCH greater contributor to modern power distribution than any other inventor, such as Edison.. (pfffttt)

  17. Chalkbot says:

    “Very clean looking & great job with the hardware! I’d love to do a Tesla coil, but I can’t figure out any practical use for it…”

    What about base defense? Duh…

  18. Juan Pablo Kutianski says:

    Please don’t forget the electrical condenser (U.S. Patent 0,464,667)

  19. Underling says:

    “Very clean looking & great job with the hardware! I’d love to do a Tesla coil, but I can’t figure out any practical use for it…”

    you can test neon bulbs with them. Or just light stuff on fire

  20. T says:

    some asking for practical usage,
    I guess put one of those into your yard and switch it on gives you a pleasant mosquito free time at your garden and on your balcony. However, careful selection of the location is needed otherwhise it it will be a dog, cat and other critters free zone as well.

    Oh my god now I have a pictures of fried squirrels for the rest of the day in my mind.

  21. biozz says:

    practical usage?
    how about what tesla designed a tesla coil to do … transmit power wirelessly!
    you can transmit some power over 100 times longer than the spark leanght

  22. Deckape says:

    Tis a thing of Beauty.

  23. Jeffk says:

    Am I the only one who saw the picture and thought “booze machine!!”?

  24. mike says:
  25. Finn Hammer says:

    I have run a tesla coil in a room with many mosquito’s in it, and the majority of them ended up as specks of zoot on the toroid of the coil.
    But in all honesty: A coil is built because it makes women smile and men jump in exitement, when they see it operate.
    The coil can also be used as a musical instrument, and if you like to see my work on that front, some of it goes back more than 6 years:

    Cheers, Finn Hammer

  26. Mvitz says:


    The music is already out there:

  27. strider_mt2k says:

    Tesla be praised!

  28. This is full of awesome!

  29. Gert says:

    When i ask people if they know Edison they say “lightbulb”. But when i ask about the way smarter and more important man Nikola Tesla their don’t know anything.

    Edison was an idiot for claiming DC was better than AC. His wonderfull lightbulb has a 10% efficiency.
    Tesla’s inventions still has way more impact on society than a vacuum glass bulb with a tungsten wire.

  30. The Steven says:

    If Tesla made a still, it might look like this…

  31. Daniel says:

    Edison did not invent the lightbulb. He just improved it… And lighbulbs have a longer lifespan on AC :)

  32. zeropointmodule says:

    roflmao @thesteven re. still.

    actually tesla was experimenting with liquefying gases as well as vacuum pumps (read somewhere that in all likelihood he generated x-rays well before roentgen)

    oh, and yay for :)

  33. michel says:
  34. Psyaneyed says:

    Tesla was one of the greatest minds of all time. He is almost completely overlooked I believe because he had the idea over a century ago to make power available to everyone at no cost. If his ideas were ever completely realized, the world would have been a completely different place. This is the man that modified a Pierce Arrow to run on wireless electricity in 1930! He drove it for 9 days and at a top speed of 90MPH! NOW THERE’S SOMETHING TO HACKADAY!

  35. Ade says:

    I heard that tesla was 7ft tall, and had sparks coming out of his ears, and that if you ever meet him and looked him in the eye then he could produce flames out of yur butt!

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s


Get every new post delivered to your Inbox.

Join 96,699 other followers