Well, if history can repeat itself, so can prehistory, even comic strip prehistory. The Solowheel from Inventist, Inc. is simultaneously an advanced form of low-energy, zero-emission, ultra-portable transportation and a modern version of Thor’s prehistoric wheel from “B.C.” Not that self-balancing people movers are anything new, even in modern times. The best known product in […]
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What is a Pager? A pager is a very simple radio that listens to just one station all of the time. A radio transmitter broadcasts signals over a specific frequency. All of the pagers for that particular network have a built-in receiver that is tuned to the same frequency broadcast from the transmitter. The pagers
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Cell Phone Jamming Basics Disrupting a cell phone is the same as jamming any other type of radio communication. A cell phone works by communicating with its service network through a cell tower or base station. Cell towers divide a city into small areas, or cells. As a cell-phone user drives down the street, the
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Understanding the CD: Material As discussed in How Analog and Digital Recording Works, a CD can store up to 74 minutes of music, so the total amount of digital data that must be stored on a CD is: 44,100 samples/channel/second x 2 bytes/sample x 2 channels x 74 minutes x 60 seconds/minute = 783,216,000 bytes
In consumer optical products — most commonly cameras — aperture describes the size of the hole that lets light into a device. Cameras use mechanical diaphragms to control how much light passes into the camera body and strikes the image sensor or film. That diaphragm works a lot like the irises in your eyes; it
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As with non-WiFi cameras, your choice of camera will be dependent on how you plan to use it. WiFi-enabled point-and-shoot cameras retail for a little bit more than their plug-and-play counterparts, from about $200 on up. As of early 2010, no WiFi SLR cameras were available; however, by using a WiFi-enabled SD card called an
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If you’ve looked at television sets at any of the big electronics retailers in the United States lately, you know that digital TV, or DTV, is a big deal right now. Most stores have whole areas devoted to digital TV sets. You’re also hearing a lot about four other topics: HDTV and HDTV broadcasts Digital
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A version-bound technical look at Vassilis Serasidis’s ATtiny13 125 kHz RFID reader: how the coil is driven, which demodulator path the owner reports, and how the 64-bit frame and software serial timing fit together.
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The first mobile Facebook users were only able to update their status using text messages. As smart phones got smarter, they were able to access Facebook’s mobile site, m.facebook.com, in their browsers. Then came the iPhone, the Android, and other advanced phone operating systems, which had app markets where users could download small programs made
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The cellular electronic payment described in this scenario may seem futuristic, but consider that: TheTrainLine, a British train ticket retailer, is piloting a smart-ticketing system that allows riders to link train tickets to NFC-enabled cell phones such as the Nokia 6131. The rider buys tickets online using a mobile phone or PC. At the station,
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