Tractor Beams are mysterious waves that can attract particles towards the source. Here, we will show you how to build an Acoustic Tractor Beam with components that can be bought directly on the Internet for less than 75$.
With this Instructable you will be able to get in your hands a device that it was only seen on SciFi movies such as Star Wars or Star Trek.
If you want more scientific background on Acoustic Tractor Beams, you can check our Open Access research papers:
Do not forget to watch the attached video in this Instructables.
We present a list of the necessary components. I have tried to place links for different countries. However, the same parts can be found all around the world, some useful websites are http://www.findchips.com/ http://www.dx.com/ http://www.miniinthebox.com/http://www.lightinthebox.com/http://www.banggood.com/
The circuit is not complicated. Basically, an Arduino will generate 4 half-square signals at 5Vpp 40kHz with different phases. These signals get amplified to 25Vpp by the Motor Driver and fed into the transducers. A button pad can be used to change the phases so that the particle moves up and down. A battery (7.3V) powers the Arduino and the logic part of the Motor Driver. A DC-DC Converter steps-up the 7.3V to 25V for the Motor Driver.
1x 300x45x15mm wood piece
1x 3D Printed Bowl
Some Expanded Polystyrene beads to levitate (between 1mm and 4mm diameter)
An acoustically transparent material: A metallic grid, very thin fabric or teabag paper.
Soldering Iron, Tin and Flux.
Screwdriver and Pliers.