On the Internet you can see various shows called “Tesla Coil and Faraday Cage”. In this show, people enter a metal cage and high-voltage sparks strike the cage, but these sparks do not touch or hit people. What’s the matter? But the fact is that people are inside a Faraday cage. In this article I will show you how to make a Faraday cage on your desk and conduct visual experiments with it.
How does a Faraday Cage work? An external electric field causes the electrical charges inside the conductive material of the cage to be distributed so that they neutralize the effect of the field inside the cage. This phenomenon is used to protect sensitive electronic equipment (for example, radio frequency receivers) from external radio frequency interference. The cage must be closed and can be made of solid metal or in the form of a mesh.
I will make a Faraday cage from a mesh and a piece of aluminum foil. I used the mesh from aluminum, it can be obtained from air purification filters. To visually observe the operation of the cage, you need a sensitive device that will respond to the electromagnetic field. I made it using one Darlington transistor ksp13 .You also need a high voltage source, which should produce sparks and discharges. I completed it according to this article.