In a household network of 220 volts 50 hertz there is not only the declared frequency of 50 hertz, but also many other frequencies - interference, the spectrum of which goes into tens of kilohertz and further. At the request of the Channel viewers, I will begin a story about how to get rid of network interference. In this video, I will talk about EMI filters. *** You can help in the development of the Channel: Yandex Money: https://yoomoney.ru/to/410013004521132 This makes it possible to purchase the necessary electronic components for shooting videos according to your requests. Thank you for your help, friends! *** If it is impossible to publish videos on YouTube, publications will continue on my channel "Unknown Physics" on Yandex Zen Video materials: https://drive.google.com/drive/folder... You may be interested in videos from the Playlist "Power Supplies. Voltage converters» • Vacuum tube stabilized adjustable... 00:00 Welcome to the «Unknown Physics» channel! 00:06 Heroes of the video – line noise filters. 00:16 Transistor and radio tube – NOT amplifiers! 01:32 Voltage spectrum in a household network 220 volts 50 Hz. 02:08 EMI filter. 03:04 Description of the EMI filter operation. 04:30 Appearance of line filter parts. 06:08 Oscillograms – spectrum of a household network 220 volts 50 Hz. 07:24 Oscillograms with a computer EMI filter – spectrum without load. 07:57 Oscillograms with a computer EMI filter – spectrum with an active load. 08:16 Oscillograms with a computer EMI filter - spectrum with an inductive load. 08:44 Summary oscillograms for the computer EMI filter. 08:58 Oscillograms with a TV EMI filter - spectrum without load. 09:13 Oscillograms with a TV EMI filter - spectrum with an active load. 09:22 Oscillograms with a TV EMI filter - spectrum with an inductive load. 09:31 Summary oscillograms for the TV EMI filter. 09:59 Cutoff frequency of the EMI filter. 10:53 EMI filter passport. 11:22 Industrial interference filter. 11:45 Oscillograms with an industrial filter - spectrum without load. 11:53 Oscillograms with industrial filter — spectrum with inductive load. 11:59 Oscillograms with industrial filter — spectrum with active load. 12:07 Summary oscillograms for industrial filter. 12:26 High-frequency and impulse interference. 12:41 About the cutoff frequency of the interference filter. 13:04 U-shaped interference filter. 13:20 Oscillograms with P-filter — spectrum without load. 13:47 Oscillograms with P-filter — spectrum with active load. 13:58 Oscillograms with P-filter — spectrum with inductive load. 14:07 Summary oscillograms for P-filter. 14:25 Two-link LC filter. 15:04 Oscillograms with a two-link LC filter - spectrum without load. 15:40 Oscillograms with a two-link LC filter - spectrum with an inductive load. 15:54 Oscillograms with a two-link LC filter - spectrum with an active load. 16:07 Summary oscillograms for a two-link LC filter. 16:35 Comparative oscillograms of a P-filter and a two-link LC filter. 17:19 Voltage spectrum of a laboratory autotransformer. 17:57 A small riddle. 18:33 What to do with the remaining harmonics? #network_interference #interference_filter #network_filter Videos in the form of short stories and tales about Physics in the world around us are released every week. If you liked the story - like and subscribe to the channel so as not to miss the continuation! QUESTIONS can be asked in the comments to any video, on social networks and by e-mail to the channel: [email protected] I answer all SPECIFIC questions. I hope that your questions and joint answers will help make the channel "Unknown Physics" more interesting! ************************************************************* The channel has many playlists that contain videos about birds and animals, about HANDMADE, DIY, HUMOR, entertaining PHYSICS, stories about TRAVEL, YUMOR, TRIPLE TRICKS, how to make a cartoon and much more ... You will definitely find a video according to your interests! The CHANNEL NAVIGATOR will help you navigate the channel. LINKS to the channel's videos are posted on personal pages in social networks and in groups: Add me as a FRIEND! (When adding, PLEASE write - where are you from and on what issue) e-mail: [email protected] Yandex Zen: https://zen.yandex.ru/media/id/5d9cc9... VKontakte: http://vk.com/afon2015 Odnoklassniki: https://goo.gl/VdSsCY Twitter: / afanasy83 Facebook: / afanasy83 Skype: afanasy83