This video is a story about line filters of network interference installed between the input of the power grid and internal circuits of electronic equipment. Such filters are necessary for attenuation of radio frequency interference, also known as electromagnetic interference - EMI, arising and present in a real household network. Also, complex filters of interference will be considered, filtering in addition to high-frequency interference and the constant component of the network voltage, appearing in a real household network. In the process of analysis of the operation of filters their main characteristics were recorded. The tests are accompanied by oscillograms recorded using the Shmelev Computer Measuring Complex. For those who want to translate the text of the video into other languages, a file with the full text of the video is attached - for substitution in an electronic translator. P.S. Due to the difficulty of watching videos on the YouTube platform, a Telegram channel “Unknown Physics” was created https://t.me/UnknownPhisics I hope to finish updating the Channel content in the near future. Then new videos will appear on the Telegram channel simultaneously with the YouTube channel. *** You can help in the development of the Channel: Yandex Money: https://yoomoney.ru/to/410013004521132 VISA (Russia) 4048-0250-0094-9167 This makes it possible to purchase the necessary electronic components for shooting videos according to your requests. Thank you for your help, friends! *** Links to the video: “Network filter” • Network filter. “Power rectifier filter” • Power rectifier filter. “How to check a transformer. Computer diagnostics of a transformer. Transformer hysteresis” • How to check a transformer. Computer... Video materials: https://drive.google.com/drive/folder... 00:00 Welcome to the channel "Unknown Physics"! 00:06 Line filters for household networks. 00:30 EMI filters. 01:16 DC filters. 01:57 Comprehensive protection against network interference. 02:36 Appearance of network filters. 03:28 Types of impulse interference. 06:00 Appearance of an EMI filter. 06:56 Amplitude-frequency response of an EMI filter. 08:19 Filter cutoff frequency. 08:30 Attenuation introduced by the filter. 08:44 Extrapolation of the removed frequency response of the EMI filter. 09:36 Possibilities for finalizing the EMI filter. 10:02 Frequency response of an EMI filter with neutral and ground connected. 10:44 Visual demonstration of the attenuation introduced by an EMI filter. 11:41 IEC 60939 standard. 12:06 External appearance of a complex interference filter. 13:23 Introduction to suppressed interference. 13:40 Transformer hysteresis. 14:29 Demonstration of transformer operation using the hysteresis curve. 17:08 Operation of a transformer with core magnetization. 18:02 Interference in rectifiers. 18:32 The shape of sine distortion in a transformer with magnetization. 21:29 Simplified circuit of a magnetic amplifier. 21:43 Analysis of the circuit of a complex interference filter for a household network. 22:59 Volt-ampere characteristics of diodes. 24:06 Passport of the 1N5408 diode. 24:25 Diode opening threshold in the complex interference filter. 25:21 Test of DC voltage cutoff by the complex interference filter. 28:43 DC filter circuit. 29:04 Amplitude-frequency response of the complex filter. 29:51 Comparison of the frequency response of the EMI filter and the complex interference filter. 30:03 Visual demonstration of the attenuation introduced by the complex filter. 31:02 Comparison of the spectra of the complex filter and the EMI filter. 31:29 Are interference filters really necessary. #Network_filter #EMI_filter #DC_filter Videos in the form of short stories and stories 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! You can ask QUESTIONS in the comments to any video, on social networks and by email to the channel: [email protected] I will 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, TRIP-MAKING, how to make a cartoon and much more... You will definitely find a video that suits 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 yourself as a FRIEND! (When adding, PLEASE write - where are you from and what is your question) e-mail: [email protected] VKontakte: http://vk.com/afon2015 Odnoklassniki: https://goo.gl/VdSsCY