Circuit source: https://www.facebook.com/share/p/1HGut3uEAd/ This is a bad and dangerous design This is a dangerous design. There is potentially lethal voltage on those probe pins. ⚡️☠️ I strongly discourage to build this. Design problems – no isolation from mains – test probes and circuit being tested dangerous to touch – pointless filter coil in output – →
If happiness were an Olympic event, the Nordic countries would be a guaranteed to fill spots on the podium. According to the latest edition of the World Happiness Report, the three happiest countries in the world are Finland, Iceland and Denmark. Finland was named the happiest country in the world for a record 9th time →
The second Friday the 13th of 2026 is here, a date synonymous with bad luck for the superstitious. Friday the 13th has a reputation as a day of bad luck mainly because two separate superstitions merged over time: fear of the number 13 and fear of Friday. When they combined, the date became especially ominous →
This is a viral class A amplifier from https://www.facebook.com/share/p/1MWzg9TXxc/ This is a classic “minimalist” single-ended Class A MOSFET amplifier. While it is praised for simplicity, it is inherently inefficient and prone to significant distortion. In this design, the MOSFET (IRF530) is always “on,” acting as a variable resistor that pulls current through the 15 ohms →
Facebook viral circuit from https://www.facebook.com/share/p/1buynd6caE/ analysis Let’s break this down calmly, because this circuit looks cooler than it actually is It works, but in the “Facebook shorts” sense, not in an engineering sense. It’s a very simple sound-reactive LED circuit. Big problem: There are NO current-limiting resistors for the LEDs. It might work for some →
What Is Braiding in Cables? Understanding Textile Braids, Shielding Braids, and Braided Conductors Cables come in many forms, and one of the most visually noticeable — and functionally important — design elements is braiding. But not all cable braiding serves the same purpose. Depending on the type, braiding can offer mechanical protection, electromagnetic shielding, or →
This posting is here to collect cyber security news in October 2025. I post links to security vulnerability news to comments of this article. You are also free to post related links to comments. →
Another bad and potentially dangerous circuit from Facebook. This is supposed to charge LiIon battery from USB power. Identified problems: – no current limiting – can overcharge the battery – red charging LED will be always on when there is USB power coming in – green charged LED will not turn on when battery is →
I don’t see any technical benefit of this cable construction for this application. – because there isn’t https://www.facebook.com/share/p/1CvWzJAZSN/ The reason is that it looks cool so people who don’t understand anything else will pay for it. So does he have mini pylons that he strings them across so that they don’t touch like they do →
Yesterday marked 34 years since Linus Torvalds, then a young computer science student, announced in the comp.os.minix newsgroup that he was working on a new operating system — “just a hobby, nothing big or professional like GNU,” as he put it. In hindsight, one of the most ironic understatements in tech history. The first Linux →