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. →
In today’s world of audio production—whether for music, podcasts, broadcasting, or live performances—digital audio mixers are the heart of the operation. These powerful tools allow sound engineers to balance, blend, and shape multiple audio signals. Analog mixers offer raw simplicity and tactile immediacy. Compared to them digital mixers provide versatility, automation, and a boatload of →
One of Finland’s most popular locks, the ILOQ C10S is a high end lock used by millions of people. IloQ lock system is a series of electro-mechanical lock developed in Finland. iLoq system is known from the design that uses electronic keys and locks that draw their power from the key when inserted inside the →
Still, Ai is not capable enough to create correct diagrams on its own. I wonder if it is posible to post working circuits to Facebook…… mostly only AI crap seems to be posted Example from https://www.facebook.com/share/p/16vJCdn37B/ The left side circuit is almost correct, but for example the control button has only one wire in it, →
This posting is here to collect cyber security news in July 2025. I post links to security vulnerability news to comments of this article. You are also free to post related links to comments. →
I saw the following circuit design posted to Facebook. Source: https://www.facebook.com/share/p/1HuYVvXHcf/ What is wrong with this design: No isolation from mains, potentially electrocutes if you touch any part of exposed LED strip. The circuit will only give around 220V/30000ohms=0.00766.. mA current that can light one normal LED but not any long LED strip like shown →