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Wireless Antenna Types |
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There are three main categories of antennas: - Omni-directional - Omni-directional antennas radiate RF in a fashion similar to the way a table or floor lamp radiates light. They are designed to provide general coverage in all directions.
- Semi-directional - Semi-directional antennas radiate RF in a fashion similar to the way a wall sconce is designed to radiate light away from the wall or the way a street lamp is designed to shine light down on a street or a parking lot, providing a directional light across a large area.
- Highly-directional - Highly-directional antennas radiate RF in a fashion similar to the way a spotlight is designed to focus light on a flag or a sign. Each type of antenna is designed with a different objective in mind.
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| | permapage | score:9897 | -qjokobloon, November 12, 2008 |
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Review: Kindle 3G ebook reader |
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Scalable fonts, built-in browser, free Internet access, long battery life, capacity for thousands of ebooks, and the ability to download free books from the web without a computer or even additional Internet access...
One of the nicest features of the Kindle is the text-to-speech function. Yes, you can have your Kindle read to you -- in either a male or a female voice. You can listen through the built-in stereo speakers or you can plug your headphones or earbuds into the standard jack. The Kindle 3g review also includes a list of free book collections at the bottom of the page. |
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| | mail this link | permapage | score:9897 | -Ray, April 8, 2011 |
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CompTIA A+ Certification Tutorial |
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A+ Certification is awarded by CompTIA, and is widely recognized as a premier certification in the area of computer hardware and operating systems. The tutorial covers recent A+ Essentials exam objectives as listed below:
1.0 Personal Computer Components
2.0 Laptop and Portable Devices
3.0 Operating Systems
4.0 Printers and Scanners
5.0 Networks
6.0 Security
7.0 Safety and Environmental Issues
8.0 Communication and Professionalism
A+ Essentials together with A+ IT Technician exam enables a candidate to obtain CompTIA A+ Certification. Instead of A+ IT Tech., one can also take any one of available optional exams (viz. A+ Remote Support exam, and A+ Depot Tech. exam). read more... |
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| | permapage | score:9888 | -Vijay, November 24, 2008 |
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canon powershot sx20is 12.1mp digital camera |
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This site review is a look at the canon powershot camera range on the market today.
With plenty of choice out there from with canon powershot sx20is 12.1 mp digital camera in the mid range just below the professional range it fits in a market that meets the needs of someone wanting to upgrade there own camera with about a mega pixil range of about 3 to 7 mega pixils.
But is looking for somthing more powerful and can make video in high definition video aswell and the 12.1 mega pixils camera can take photos from long range with ease and the camera video recording allows about 30 minutes recording time with the standard 4gb sd memory card installed inside.
Other features gives this new version of the sx10is a powerful boost in performance and an impressive upgrade. Video can be played it to your hd ready tv with an html lead or a usb port that can fit to a computer to play back hd video.
You can move the screen around to view the screen when
taking photos at low and high angles like over heads in a crowd or angle from the floor pointing upwards or you can self portrait with the screen turning 180 degrees and protecting the screen when not in use close the screen inside the camera. read more... |
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| | permapage | score:9885 | -mark hayward, December 8, 2009 (Updated: March 22, 2010) |
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An Introduction To Computer Printers and Scanners |
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The article covers various types of printer and scanner technologies available today. The technology behind the working of laser printers is discussed extensively. The contents are provided below:
1. Introduction to printers
1. What are printers
2. Types of printers
1. Impact printers
2. Solid ink printers
3. Thermal printers
4. Laser printers
2. Introduction to scanners
1. Flatbed scanners
2. Sheet-fed scanners
3. Hand-held scanners
3. Printer and scanner interfaces
4. Installing printers and scanners
5. Printer and scanner problems and troubleshooting
6. Tools to troubleshooting printer/scanner problems
7. References
1.1 What are printers?
Printers are commonly used output devices that produce a hard copy of document stored in electronic form, i.e they put information from computer on to paper.
There are various kinds of printers available today like Impact printers, Bubble-jet printers, Laser printers, Thermal printers etc.
1.2 Types of printers
1.2.1 Impact printers
Impact printers are among the old printing technologies, which make use of inked ribbon to make an imprint on the paper. Impact printers are considered noisy when compared to other printers.
The most commonly known impact printers are:
1. Daisy-Wheel Printers
2. Dot-Matrix Printers
How Daisy-Wheel Printers work?
A Daisy-Wheel Printer works on the same principle as ball-head typewriter. The daisy wheel printer consists of a disk made of plastic or metal on which characters stand out along the outer edge. The printer rotates the disk to print a character until the desired letter is facing the paper, after which a hammer called solenoid strikes forcing the character to hit an ink ribbon making a mark of the character on the paper.
Their speed is rated by cps (number of characters per second).
For complete article, please visit tutorialsweb.com
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| | permapage | score:9875 | -Vijay, October 25, 2009 |
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Upgrade The Cooling On Your Graphics Card |
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| My Arctic Cooling Silencer NV5 Revision 3 is a replacement cooler for the factory heatsink on my nVidia GeForce 6800 GT graphics card. It is compatible with all nVidia GeForce 6800’s and apparently 7800’s as well. read more... |
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| | permapage | score:9875 | -MaverickBlogging, July 7, 2009 |
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Flash Memory Tutorial |
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Flash memory is a form of EEPROM (Electrically Erasable Programmable Read-Only Memory) that allows multiple memory locations to be erased or written in one programming operation. In other terms, it is a form of rewritable memory chip that, unlike a RAM(Random Access Memory) chip, power
supply is not required to hold the contents. It is commonly used in memory cards, USB flash drives, MP3 players, digital cameras and mobile phones. Flash memory is also an example of a Non-Volatile Read Write Memory (NVRWM).
1. Technical Overview of Flash emory
1.1 Operation Principles
1.2 Structure and Operation of Flash Memory
2. Flash Memory History
3. Limitation of Flash Memory
4. Low-level access
4.1 NOR memories
4.2 NAND memories
4.3 Difference between NOR and NAND memories
5. Flash file systems
6. Capacity of Flash memories
7. Data Protection
8. Security
9. Types of Flash Memories
9.1 Mobile device memory
9.2 Compact flash memory
9.3 USB Flash drives
10. Hard disk drives vs. Flash drives
11. Applications of Flash Memory read more... |
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| | permapage | score:9866 | -Vijay, July 6, 2008 |
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Zman tech blog |
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Zman blog is a new tech resource on the block but it is definitely a must visit for Apple product lovers and tech buffs. Launched just this March 15, this blog teems with many interesting how tos and tips for Apple products like the iPod, iPhone, and the new ly released iPad. What is good about this site is that every tips-type article comes with an instructional video posted on the zmandigital Youtube channel.
Though the blog generally focuses on Apple events and products, it also features other gadgets, as well as the latest IT news. The site is easy to navigate since all the articles are properly organized into categories such as computing, gaming, mobiles phones, internet, etc. The site also features some live coverage on important IT events plus some write-ups on current issues like counterfeiting. read more... |
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| | permapage | score:9861 | -ejcastel, May 10, 2010 |
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Electronic Circuit Projects |
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| Circuit-Projects.com is an electronic circuit schematics archive with full descriptions, PCBs and layouts. read more... |
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| | permapage | score:9860 | -Eisac Prevot, December 24, 2007 |
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HTC Reviews, Tips and Tricks |
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Free HTC is an unofficial HTC information portal. The site is updated daily with new tips, tricks, news and reviews regarding HTC devices.
Recently, FreeHTC.com's post regarding a new device released by AT&T was featured on many of the top Tech sites including Engadget, TheBoyGeniusReport, Gizmodo and many more.
We work hard everyday to bring our readers the most relevant information regarding HTC products and news. read more... |
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| | permapage | score:9840 | -TechBoy78, January 31, 2009 |
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The Return of the 3D Crystal Ball |
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| In a recent interview, Gregg Favalora, Actuality Systems' CTO and Founder commented on the future of his company's technology, currently used mostly by the medical industry as a 3D aid. Although he did not disclose the details he was willing to say that: "We are working on exciting, hologram-like displays for the desktop and arcade". The interview also discusses the development of Actuality Systems' Perspecta Spatial 3-D System hardware from the 200 MHz Texas Instruments early in the decade to the modern NVIDIA GPU. read more... |
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| | permapage | score:9835 | -iddo, October 27, 2006 |
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A temperature and humidity data logger project |
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Temperature and Humidity Data Logger
This project uses BasicStamp 2P (also you can use PIC, Atmel, 8051...) to interface with a DS1307, SHT15, JP Module and 16x4 LCD display. Code used is standard PBasic 2.5, it should work on most BasicStamp chips.
The project is a data logger demonstration program. It can record temperature and humidity data to MMC/SD card with date and time. Press the temperature unit select button switch to select Celsius or Fahrenheit. The data can be processed to the virtual XY chart or Polar Chart through the website ( www.jianpingusa.com/jpchart ). read more... |
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| | permapage | score:9827 | -oldspring, November 17, 2008 |
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Surface Mount Components - An Introduction. |
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Surface mount components are being used extensively these days. Most of the electronic gadgets that we use, such as mobile phones, digital cameras, CD players, LCDs, etc. use surface mount components extensively. A comprehensivetutorial on SMT components is available at Tutorialsweb.com. The contents are given briefly below: PassiveComponents: Surface mount passive components including resistors, capacitors, and inductors were discussed. Active Components: Examples of surface mount active components are diodes, Transistors, and ICs. ICs can be further divided in to the following categories: - SOICs (Small Outline Integrated Circuits)
- SSOP (Shrink Small Outline Package)
- TSSOP (Thin Shrink Small Outline Package)
- SOJ (Small Outline J-leaded package) and others
Surface Mount Integrated circuits that are available in Quad-in-Line include the following: - QFP (Quad Flat Pack)
- PGA (Pin Grid Array)
- BGA (Ball Grid Array)
Chip-on-Board (COB) is a special IC that uses bare die for bonding on to the PCB. It is commonly used where very high component density is required, and where lead lengths may affect the electrical parameters and thurs the functioning of the circuit. Please visit the website for complete tutorials on SMTcomponents and SMTAssembly. read more... |
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| | permapage | score:9825 | -Vijay, November 27, 2006 |
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HDTV: 1080p vs. 1080i |
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Here's a high definition TV cheat sheet -- what you need to know to make the decision between 1080i vs. 1080p.
In this case, the subject is HDTV resolution, and 1080p resolution in particular. This seems to be on everyone's minds as we head into the holiday buying season and we're faced with more HDTV buying choices than ever before. Not a day goes by without someone asking whether they should just buy a "standard" 720p/1080i set or step up and pay the extra bucks for a higher-resolution 1080p set. Or what it all means. And so, I've tried to condense the whole discussion into a neat, little cheat sheet. Read on for the quick and dirty lowdown on 1080p. read more... |
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| | permapage | score:9787 | -Ray, December 4, 2005 |
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HDMI, DVI , Component Video Cables and Interconnects Explained |
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HDMI, DVI , Component Video Cables and Interconnects Explained
As the HDTV market continues to heat up, consumers are in need of being educated on the latest technology in order to make intelligent purchasing decisions. There are a plethora of articles explaining the technical pros and cons of the 3 dominant HDTV display technologies namely: LCD, Plasma, and DLP. However, one all- important, but overlooked feature in selecting a HDTV set is the type of HD video connection. The video connections available for HDTV are: component video, DVI (digital video interface) and HDMI (high definition multi-media interface). We will discuss briefly the pros and cons of each. read more... |
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| | permapage | score:9783 | -jeff su, November 24, 2005 (Updated: March 21, 2007) |
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HDTV Wonder and 1080i |
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Recently I decided to make my own quick and dirty HD-DVR by installing an ATI HDTV Wonder. Installation was pretty painless and since I had a ATI Radeon 9200SE I finally got everything working smoothly (Note: in order to get the ATI Multimedia Software installed correctly I had to download the latest drivers from the ATI website).
When I was finally up and running I could watch digital 480i and 720p channels (the included antenna is quite nice since I am about 25 miles from the broadcast station). With the 1080i channels, however, I could see that I had a strong signal and the audio was coming in perfectly but I couldn’t see any video. Also, the 480i and 720p playback was a little choppy - every minute or so the video and audio would skip - it was definitely still watchable, but I wanted to address this problem as well. read more... |
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| | permapage | score:9766 | -pwily, February 24, 2006 |
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