TV - Rectenna Converts Radio Waves To Electricity Energy harvesting technologies collect a very small amount of power for low-energy electronics, this rectenna is one of the latest advancements in this area. "The word 'rectenna' is the combination of the abbreviated words 'rectifying' and 'antenna' and it basically converts radio waves into electricity." "Today we are exhibiting on the theme of environmental electricity, with exhibits in two areas of collecting wireless LAN and digital terrestrial broadcast signals. Our concept is to collect electricity by collecting electrical waves within the office or at home, or by attaching this rectenna to an outside wall." The rectenna, developed by Nihon Dengyo Kosaku, is relatively thin, at 12mm for Wi-Fi and 30mm for digital terrestrial broadcast waves, and uses only 50µW of power to start. "With wireless LANs, it can generate power in the order of micro-watts at a distance of around 10cm.
johngineer The purpose of this post is to lay out some of the stuff I wish someone had explained to me when I was first learning about electronics. This is a pretty entry-level introduction, intended by me to ‘fill in the gaps’ with regard to basic operating principles. Opamps are not all that complicated, but for many people they appear as a black box. First, let’s look at the schematic symbol for an op-amp and identify the pins and their functions. V+ is the positive supply and V- is the negative supply. Vin+ is the non-inverting input. Vin- is the inverting input. Vout is the voltage output. There are two concepts which are typically used to describe how opamps function. This voltage difference can be considered the input to the opamp. So now that we’ve dealt with the Vin terms, let’s talk about A. It’s much better to approach opamp design from a different angle. “An opamp tries to keep the voltage across its two inputs at zero.” I’ll answer the second question first. –thus– –or– which becomes:
Gurpartap/GSTwitPicEngine Concise electronics for geeks Copyright (C) 2010 by Michal Zalewski <lcamtuf@coredump.cx> There are quite a few primers on electronics on the Internet; sadly, almost all of the top hits resort to gross oversimplifications (e.g., hydraulic analogies), or convenient omission, when covering subtle but incredibly important topics such as the real-world behavior of semiconductors. There are some exceptions, to be sure - but they tend to suffer from another malady: regressions into mundane, academic rigor, complete with differential equations and complex number algebra in transient analysis - a trait that is highly unlikely to be accessible, or even useful, to hobbyists. The physics of conduction [link] As you probably recall from your school years, the dated but still useful Bohr model of the atom explains that atoms consist of a dense center (nucleus) with a variable number of protons and neutrons. The strongly bound and heavy nuclei of stable isotopes do not undergo any structural changes under everyday circumstances.
Visualizing EAGLE Edits with a Gerber Viewer The EAGLE Schematic/PCB editor keeps up to 10 backups of your board and schematics, reflecting the board start at the last times you saved you work. This can be very valuable if you screw something up, but I've always been a bit frustrated that it isn't easier to look at those files to see what changed in which revision. (EAGLE won't directly open the backup files, so you have to rename each backup before you can look at it. And EAGLE won't open multiple files at one time, so that you can compare them side-by-side, either.) Now, one way to look at a PCB is to generate gerbers (the standard "plotter format" for PCBs), and use one of the gerber viewers to look at those. However, if you DO pick your layer colors carefully, you can display two (or more) layers that are almost the same, and have the differences HIGHLIGHTED for you!
Change management (ITSM) Change management is an IT service management discipline. The objective of change management in this context is to ensure that standardized methods and procedures are used for efficient and prompt handling of all changes to control IT infrastructure, in order to minimize the number and impact of any related incidents upon service. Changes in the IT infrastructure may arise reactively in response to problems or externally imposed requirements, e.g. legislative changes, or proactively from seeking improved efficiency and effectiveness or to enable or reflect business initiatives, or from programs, projects or service improvement initiatives. Change Management can ensure standardized methods, processes and procedures which are used for all changes, facilitate efficient and prompt handling of all changes, and maintain the proper balance between the need for change and the potential detrimental impact of changes. A change is an event that is:
Troubleshooting and Repair of Consumer Electronic Equipment Including: Test Equipment, Supplies, Parts, Incredibly Handy Widgets(tm), Sources of Information, and Where to Find Broken Stuff Version 2.47 (21-Feb-12) Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: This notice is included in its entirety at the beginning. There is no charge except to cover the costs of copying. Table of Contents Preface Author and Copyright Introduction Getting Into Troubleshooting Comments on How to Learn Repair THE Question: To Repair or Not to Repair If You Decide That You Don't Want to Bother Repairing Something Smoking Around Electronic Equipment General Safety Considerations Basic Troubleshooting Some of My Rules of Troubleshooting Some Quick Tips or Rules of Thumb On-Line Tech-Tips Databases Getting Inside Consumer Electronic Equipment How to Build Obsolescence In Before the Name Goes On Tools, Test Equipment, and Other Stuff Hand Tools Emergency Screw Removal Plastic Screw Thread Repair Workbench and AC Power Adhesives
Building a simple Fritzing component - Tales from the Evil Empire This is me shaving a yak. Shaving the yak, if you don't know, is what you do when a seemingly simple task necessitates many recursive and unforeseen sub-tasks in order to be carried out. The story goes like this… Let's say that I want to paint a picture, but I'm in a shack in the middle of the desert and I don't have a canvas, brushes or paint. I do have a piece of strong cloth, a few pieces of wood, and the rocks around the shack can provide some pigments that I can mix with some oil. For the nails, I can extract some from the shack's structure itself. Today's metaphorical yak is the representation in Fritzing of a $0.95 part, a knob potentiometer. A Fritzing component is typically made of five XML files that can be optionally packaged together using a zip format. Each of the SVG files should be crafted with precision, following the component's datasheet, that always contains the precise dimensions of the part. Then we have tags, to facilitate search. And… this is it, we're done.
RipBot264 v1.17.2 - Simple and easy to use GUI -> IPOD . PSP . CONSOLES . BLURAY This small app written in Delphi is specially for people looking for something simple without exotic filters and unnecessary settings. Download .7z -> Common problems:1) AviSynth Error message or other decoding problem (avs2avi.exe/avs2yuv.exe crashes) Uninstall all codec packs , AviSynth , Haali Media Spliter , ffdshow. XP users also must install Windows Media Player 11! Q: What does 4.1 profile do over 4.0 and would 4.1 be better for working with HD DVD/Blu Ray discs? Changelog Code: v1.17.5 Added: OPUS AUDIO CODEC Added: UT Video is now accepted in DE mode Added: workaround for grey frames in DE mode Fixed: combining large number of chunks in DE mode Fixed: hanging with hardcoded .ass subtitles Changed: On windows 8 libavcodec is now set as default VC-1 decoder in FFDshow Updated: FFmpegSource 2.19, Fraunhofer AAC Encoder v3.02.16 , FFmpeg 2013-12-07, MediaInfo 0.7.65, MKVToolnix 6.6.0, x264 r2345 [FULL LOG]
Lessons In Electric Circuits A free series of textbooks on the subjects of electricity and electronics Copyright (C) 2000-2015, Tony R. Kuphaldt These books and all related files are published under the terms and conditions of the Design Science License. A copy of the Design Science License is included at the end of each book volume. As an open and collaboratively developed text, this book is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Access individual volumes, I through VI: Edition numbers reflect major structural changes to a book volume such as the addition of new chapters, the substantial expansion of existing chapters, or a change in markup language (source code formatting). "Last revised" dates reflect non-trivial changes only. Click here for a detailed changelog of all books. Note to instructors: Interested in contributing to this project? News flashes (Reverse chronologic order) All volumes!