Ethernet is 40 years old. In 1973, Bob Metcalfe sent an internal memo for a LAN design. Ethernet at 40: Its daddy reveals its turbulent youth is a well worth to read article that tells about the youth of Ethernet and why it became the dominant LAN standard. It also tells how much Ethernet owes →
Logic Sniffer Java client is an alternative OLS-client provides a software client for the Open Bench Logic Sniffer logic analyser hardware (that is based on ideas from open source SUMP analyzer). Software works also with SUMP compatible devices and Bus Pirate hardware. When tested with the demonstration data the software seemed to work quite well →
Google now allows web developers to share hosted websites via Google Drive. Google Drive now lets developers share hosted websites by storing HTML, JavaScript, and CSS files article gives you nice instructions how to do that. The basic idea is to upload site files to Google Drive folder and share it a as “Public on →
With all the talk of Internet filtering in Australia and the high cost to implement the filter, an Australian technology distributor has come up with a cheaper solution to the governments Internet filter: The Kogan Portector. That filter in the video did not get into real use. At November 2012 finally Australian federal government has →
My article Signal reference grids in the data center shows that different types of data communication interfaces are classified into susceptibility classes: Data communication interface classification Susceptibility class: Low immunity Interfaces in class: Parallel ports, RS-232 ports, Proprietary back-plane, Video cables Characteristics: Copper cabling with ground referenced signals. Any shift in ground voltage between the →
It is sometimes suggested that a mains power isolation transformer might be used to solve the ground loop problem. It is true, that many times a mains isolation transformer does help, but not always. A system with properly used isolation transformer is still safe, it can be even safer than system without isolation transformer. Remember →
One of the most common direct coupled noise sources is when the ground which is being used for reference or return is not referenced to earth as expected. This is especially prevalent in sensitive high-gain circuits. Grounding and Shielding Existing Equipment – How to effectively minimize EMI issues when best practices are not available is →
Grounding and shielding is an often misunderstood process. It is common to hear quotes ranging from “it’s just black art!” to “the rules change all the time!” and “there’s no way to understand it!” These statements are often repeated but not true. There is a process, it hasn’t changed, and the more one knows about →
Reverse engineering salvaged part footprints article mentioned an interesting idea to use a microscope software to process an image of the board. Measuring with Software article mentions an interesting free computer-based microscopy software MiCam. MiCam software allows (once you have calibrated it) you to draw more lines on the photos and calculate and display the →
Fun for this Friday: Lighten up! Light-Emitting Dudes video. Light Emitting Dudes takes a team of freerunners, geared up from head to toe with LED lights, and sets them loose on the streets of Bangkok at night. →