This version comes with a 35mm solid aluminum sphere. Get this amazing (and affordable) reproduction here:įrom engineDIY: BUY NOW: Tesla's Egg of Columbus The Krypton tube also exhibits interesting oscillations with this particular Tesla coil. The color of each gas is due to a mix of the colors emitted from electron energy transitions specific to each element- the basis of spectroscopy. Each gas has a characteristic breakdown voltage and emission spectrum- note that Nitrogen has the highest breakdown voltage and only glows when very near the coil where the field is most intense whereas Neon and Helium have the lowest breakdown voltage and begin to glow many centimeters away from the coil. Gas Collection for Emission Spectra: pure samples of hydrogen, nitrogen and five noble gasses are subjected to the high frequency pulsed field of a miniature Tesla coil. Here is a excellent article with an overview of the physics of glow discharge and its application in lighting and other technologies. The breakdown voltages of the elements featured in this post are described by Paschen's Law: Here is the miniture tesla coil used in the video: I made the display holder and I got this set of gas tubes here (about $7 per tube):

Powered by a 24V DC supply, this unit is fairly safe due to a low current (mA)- the discharge feels like a light tickle (but don’t touch the electrode- it gets hot). The 10 cm long sparks are made possible by a very high voltage, but also a very fast discharge of a capacitor, and each lightning flash is accompanied by a dramatic popping sound characteristic of capacitor discharge (shown up close in 240fps slow motion). In this novel design the coil is created using modern printed circuit board (PCB) technology producing a spiral of many conductive windings, so thin and close together it looks a bit like a gold phonograph record. Create amazing Telsa coil lighning at an affordable price! Please be sure to employ all appropriate safety precautions when utilizing any electrical circuity.Ĭlick here for similar amazing devices from engineDIYĭisk Tesla Coil: incredible coronal brush discharges form intricate miniature lightning in this variation of the famous air core double-tuned resonate transformer invented by Nikola Tesla in 1891.

Galton board video