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 →
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 →
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 →
Selling products whose design anyone can access, edit, or use on their own is pretty crazy. It’s also good business according to 13 Open Source Hardware Companies Making $1 Million or More (video) article. The article mentions thirteen companies with million dollar revenues from open source hardware (OSHW).Companies providing OSHW allow all designs of the →
Power Quality and Utilisation Guide is a free on-line reference source for power quality information. It provides both background theory and solutions from electrical power industry. The guide is prepared by specialist authors from industry and academia, and edited by Copper Development Association‘s David Chapman. The Guide is organized into 8 sections and presented in →
Internet is usually a goldmine of all technical information, but there’s not much on the internet about the rpm rotation sensor and it’s specification. CPU Cooling Fan Tachometer standards tries to fill this gap. It page describes a little about the tachometer or rpm rotation sensor and it’s electronics. CPU fan pinout page gives the →
Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It’s intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments. So very interesting stuff.. The microcontroller on the board is programmed using the Arduino programming language and the Arduino development environment. Arduino programming environment is lean →
I have written a lot of on electret microphone connections on my Powering microphones document. Here are some additions to my documents on electret microphones I found at SANKEN Basis of Wiring Method web page. The first circuit diagram shows the traditional “2 wire” method of wiring an electret capsule. Practically all electrets I have →
Some days ago read Things Every Electrical Engineer Should Know about EMC slide set by Todd H. Hubing Michelin Professor of Vehicular Electronics Clemson University. I must say that it is an interesting slide set to check. It is a short 25 slide set that introduces EMC fundamentals and ground loops. Here is one fact →
Modern automobiles are no longer mere mechanical devices; they are pervasively monitored and controlled by dozens of digital computers coordinated via internal vehicular networks. Experimental Security Analysis of a Modern Automobile report experimentally evaluates these issues on a modern automobile and demonstrate the fragility of the underlying system structure. The paper demonstrates that an attacker →