iPhone mag-stripe reader stalled article tells that Square, the expected to be breakthrough business launched by twitter-founder Jack Dorsey, won’t be shipping as scheduled. Interesting is that Square was just a magnetic-stripe reader, and that there were a dozen credit card-processing applications on the iPhone. Only this time, it comes with a plastic lump that →
Ground loop can cause considerable currents to flow on all cables on the loop. It is not uncommon to have a voltage of 1V RMS between the earth connections of power outlets that are wired separately back to the switchboard. This small voltage, with a total resistance of perhaps 0.2-0.5 Ohm, will cause a loop →
An ungrounded system is one in which there is no intentional connection between the system conductors and earth. When the neutral of the system is not grounded, it is possible for high voltages to appear from line to ground during normal switching of a circuit having a line to ground fault. These voltages may cause →
Optical networking is transforming the broadcast studio. The continued transition to HDTV within the professional broadcast industry, the advent of 1080p50/60 production, D-Cinema production and higher resolution / bit depth formats, are all factors driving the widespread adoption and build out of 3G SDI capable broadcast infrastructure. Optical SDI Networks: Broadcasters Beware! 2010 NAB Show →
The biggest telecom operators are giving bad service. My current operator is Elisa and I am started to get pissed of their poorly working Internet connection. Packet loss of around 50% for several days makes the connection pretty useless. And this is not the first time. Why they can’t get fixed fiber optic connection working →
If you’re watching the World Cup or just seen few clips on the news, you’ve no doubt learned about the vuvuzela, a buzzing horn capable of drowning out TV announcers. There are are many people who want to to filter the vuvuzela buzz from your World Cup broadcasts. Anti Vuvuzela Filter marketed article tells that →
IBM has published a pretty interesting Creating mobile Web applications with HTML 5 article series that tells how to use HTML5 to make mobile applications. HTML 5 is a very hyped technology, but with good reason. As promising as it is for traditional browsers, it has even more potential for mobile browsers. Even better, the →
Differential Scope Primer is a good introduction to oscillospe measurement. This web posting is a shortened version of the information on that document related to ground loops. I have also added here some of my own comments. Most oscilloscopes are designed to measure voltages that are referenced to earth ground, which is connected to the →
So, if you have wondered why LED light bulbs are so expensive today, How LED Light Bulbs Are Made article gives explanation of how they are manufactured and how that compares to the manufacture of traditional light bulbs should help. However, it also reveals why the cost will fall pretty dramatically over the next few →
EDN magazine publishes every year directory on various microprocessorors. The directory provides a snapshot each year of the companies, products, intellectual property, and software-development tools available as digital-signal-processing resources for embedded-system developers. Scratching the surface: The 2010 DSP Directory lists the relevant DSP offerings this year. This directory aims to provide designers and system architects →