Need to monitor Linux server performance? Try these built-in commands and a few add-on tools mentioned in 20 Linux System Monitoring Tools Every SysAdmin Should Know article. Most Linux distributions are equipped with tons of monitoring. →
I had been getting some intermittent noise from my Panasonic PT-AE900E video projector after some years of usage. It sounded like a dry bearing on a fan, but it turned out that it was iris that caused the problem. I decided to take a more look at this problems when I had time to change →
EDN magazine reported just few days ago that National Robotics Week has started. There are many robotics events arranged around USA. EDN magazine page from last Friday has a list of links to interesting articles on robotics. There are for example articles on Roomba sensors for hackers and building a power supply for your robot. →
I just accidentally found my way to Super cool video hack: DIY Olympics virtual lane markers page that looked interesting. It says that a student, Xiaoyang Kao, recently figured out how to make his own Olympics-style lane markers. The virtual lane graphics for swimming with css3 page tells how this video effect was done. Instead →
I wrote few years ago blog article Unshielded RCA cable is bad design. I just received yesterday a comment on it: “It’s not always that simple. There are equipment combinations which REQUIRE twisted pair RCA. Here’s explanation: http://www.youtube.com/watch?v=QOagVDZLQnA” So I watched this Truth about RCA signal cables video mentioned on this comment: The video was →
A suitable tool to safely discharge capacitors is needed when you want to work with circuits that have dangerous voltages inside them. Typical examples of such devices mains powered switch mode power supplies (you need to safely discharge main capacitor) and different cameras (the flash unit has a large capacitor charged to 400-500V voltage). Those →
Free and Open—and Their Opposites article gives a a linguistic look at some tenets of Linux. I found it interesting reading because I have written articles to magazines on open source software to magazines and I have needed to think about the right words to use for writing. Here are some information picked from that →
Do you still remember Overly Attached Girlfriend meme? Hacking a radio controlled spy device for overly attached girlfriend page has yet another update to this theme: a special DIY spy device. Hacking a radio controlled spy device for overly attached girlfriend article has also information how it was built. →
How much does your web framework choice affect performance? The answer at Framework Benchmarks page may surprise you. Netty, Vert.x, and Java servlets are fast, but the researchers were surprised how much faster they are than Ruby, Django, and friends. Here is one graph from Framework Benchmarks page that shows you the results. If you →
The mobile phone turns 40 years old article tells that the first mobile phone was used by Martin Cooper to phone a rival at AT&T’s Bell Labs on 3 April 1973. Happy birthday mobile phone! Now it is estimated by the International Telecommunications Union that there are six billion mobile phone subscriptions in the world, →