Bluetooth Headset Hack. How To Build A Spark Gap Tesla Coil (SGTC) Shoot foot-long bolts of lighting through the air, light fluorescent tubes without wires, and power your other high voltage experiments with the aid of this tabletop-sized Tesla coil! Once the parts have arrived, it comes together in about a weekend, and for less than $200 even for those without a big bin of spare parts. I built this coil for fun over a few weekends during 10th grade, juggling eigenvalue problems and European history for drilling and soldering high voltage components. The key to this coil's performance on such a tight budget is that all of its components are designed to work well together. Using some basic concepts from AC circuit design, the components are matched to perform well without requiring massive amounts of power. Some "coilers" use microwave oven transformers to pump kilowatts of energy through poorly matched circuits, resulting in large losses and mediocre performance.
For contest entry details on this instructable, see step 10. Featured on Hacked Gadgets! Vintage book travel-tech organizer. As you may have figured out from my My Life Scoop posts, I’m a bit of a nut for tech accessories, especially pocket-sized ones. I can’t get over how awesomely small our entertainment devices are becoming; it makes traveling with them so much easier. But one issue I keep running into is how to neatly organize everything, especially the power cords and connector cables that accompany my favorite devices. Rather than spend another plane trip rummaging through my catch-all carry-on bag searching for my headphones, bumping my head on the seat in front of me every time, I decided to make a small tech-accessory organizer using elastic ribbon and an old vintage book cover. This project can be sized up or down and customized in many different ways — the best approach is to gather all the tiny tech things you travel with and see how much there is.
Have a DIY project you’d like to share? Read the full how-to after the jump! Materials Instructions 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. RJ-45 key chain and rack. Zomgtronics - Electronics that make you go ZOMG!! I want one! What is a LED cube. A LED cube is like a LED screen, but it is special in that it has a third dimension, making it 3D. Think of it as many transparent low resolution displays. In normal displays it is normal to try to stack the pixels as close as possible in order to make it look better, but in a cube one must be able to see trough it, and more spacing between the pixels (actually it's voxels since it is in 3d) is needed.
The spacing is a trade-off between how easy the layers behind it is seen, and voxel fidelity. Since it is a lot more work making a LED cube than a LED display, they are usually low resolution. A LED display of 8x8 pixels is only 64 LEDs, but a LED cube in 8x8x8 is 512 LEDs, an order of magnitude harder to make! This is the reason LED cubes are only made in low resolution. A LED cube does not have to be symetrical, it is possible to make a 7x8x9, or even oddly shaped ones.
Experiment and have fun! That's it, you're done! Grab your magnet and start experimenting with your new magnetic putty. You can stretch out a strand and make it follow your magnet, you can polarize your putty to work as a magnet itself, and then there's the classic of placing the magnet directly on the putty and watching it envelop the magnet. There's plenty of fun to be had, check out the video I made with some of the fun you can do. Some frames have been sped-up to illustrate magnetic properties. Of course, aside from being magnetic your putty still retains all the properties of the original Silly Putty. Caution:Putty has been known to leave a residue on some surfaces, even more so with the iron oxide powder. What are you waiting for? Have fun!