A non-contact voltage tester (NCVT) is a handheld electrical tool used to quickly and safely detect the presence of AC voltage in wires, outlets, switches, and electrical devices—without touching any bare conductor. It uses capacitive coupling: when you bring the tip close to a live conductor, the tester senses the electric field generated by AC →
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 →
Everything goes in the square hole like here https://youtu.be/baY3SaIhfl0?si=57xokrHHX-ciZH38 →
I saw this bad circuit posted to Facebook: It at quick glance looks like a FET based solid state relay (SSR) design to control 230V AC. But actually it is not suitable for the application at all. If you connect the circuit like shown, it will not work as planned and many components will be →
This posting is here to collect cyber security news in August 2025. I post links to security vulnerability news to comments of this article. You are also free to post related links to comments. →