Hello friends! This time I'm going to talk about this device, which resembles a fake perpetual motion machine. But in this case it is an unusual musical instrument. I hope you don't believe in the creation of perpetual motion machines, you need to believe in God, but not in perpetual motion. There are many videos on the Internet about the creation of perpetual motion machines, but I warn you in advance that the authors of the video are deceiving you. So, let's get back to this device. It consists of two parts, one part I bought in a store and the other I made. I bought these metal balls suspended from a thread in the store. This device calms the nerves and demonstrates the law of conservation of momentum. It can be used to demonstrate the law of conservation of momentum. This can be done using different methods, as in this video. You can reject one ball, you can reject several. Over time, due to the resistance of the medium, due to the transition of shock energy into the amount of heat, they stop. I made sure that they didn't stop, I came up with an electromagnet through an Arduino relay. You can use the map function to program the relay duration from 1 millisecond to 1023 milliseconds, as I have done. But I think you can program it yourself, if of course you have the skills to work with Arduino. So, I control the relay, as a result of which such shock sounds are created. Maybe someday I'll learn how to play melodies on it. So let's take a closer look at the part of the device that I made, this is an electromagnet, more precisely, a copper wire is wound on a metal bolt and an electromagnet is obtained. The electromagnet requires a current supply. A battery is used for this purpose. Rayleigh allows you to turn off the electromagnet with one frequency or another, which is exactly what you need in order for the percussive music that you hear to take place. I put it all in a black box to create some illusion of a fake perpetual motion machine. That's all for now. I wish you a Merry Christmas to Jesus Christ. For me, Christmas is the birthday of Jesus Christ, I hope for you as well. Love each other! So far, good luck until we meet again. Yuri Kovalenok was with you