The biggest plague in electrical engineering (AI-translated voiceover)

Due to several questions regarding bad foreign subtitles on the German version, I decided to create this AI-translated English version. This is not my real voice :D This video mainly applies to all countries using 220V or higher mains voltage. I am very grateful for all interesting comments! Even if I can’t always reply straight away, I try to read everything. - This is a fairly small channel, so I appreciate every subscription! - The common mode noise here cannot drive high currents. There may be high voltages, but due to the low currents (some 10µA ... some 100µA) there is no danger for humans (in contrast to sensitive components and devices)! So don’t worry :) - There are some imperfections in the video: - Devices with two-pole mains cables can also have a metal housing! This must then be insulated from the inside against the mains voltage - My video applies to primary switch mode power supplies - I should also have mentioned the noise suppression capacitor C27. I simply forgot to do so. The noise mentioned here also occurs without the capacitor, but to a lesser extent. The capacitor is used to suppress very high-frequency components and significantly increases the low-frequency components. This avoids plague by cholera, so to speak. - This video is NOT intended to cause panic, but to inform and sensitise people to the subject so that less damage or inexplicable effects occur when handling switch mode power supplies (e.g. “Why did it just spark?“). - The video is NOT intended to encourage you to dispose power supply units, but simply to be aware of the dangers. - The optocoupler also provides galvanic isolation! - Note at 5:10: there is an earthed mat under my feet, so my finger had approximately earth potential. - The effect shown here basically affects almost all interfaces such as HDMI, USB, SATA, eDP... - Even if some viewers don’t think it’s possible: Because of exactly this interference, devices from the most diverse areas (televisions, graphics cards, laptops, mobile phones, cameras, amplifiers, oscilloscopes,...) break or get damaged worldwide. A simple USB power supply unit can therefore destroy an expensive professional camera. - Protection diodes: Absolutely justified objections. Almost all data pins, inputs, microcontrollers etc. have (internal) protective diodes. That is correct! Normally nothing happens because of this (see video 16:00). In theory, therefore, there should never be any problems. However, practice clearly shows that problems do occur and ICs, components, interfaces etc. do get damaged or destroyed as a result.