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How does a vibrating cell phone or pager work?

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I have both a pager and a cell phone that vibrate instead of ringing when I get a call. How does that work?

10 Types of Microphones

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Microphones have been around in some form for more than 150 years. Modern mics incorporate fiber optics, microchips, and even lasers to suit a variety of audio needs.

CCD vs. CMOS Censor: What's the Difference?

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CCD and CMOS image sensors both convert light to electrons in a digital camera. Learn the differences between CCD and CMOS sensors.

Do certain radio wave frequencies (like those used by cell phones) pose health risks?

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Do certain radio wave frequencies pose health risks? If so, is it safe to live within a quarter mile of a cellular phone tower or a radio antenna?

How Does a Camera Obscura Device Work?

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A pinhole camera is the simplest camera possible. To get a better understanding of how they work, read more about camera obscura principles.

How To Tell if Your Phone Is Tapped

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It's possible and relatively easy for someone to tap into your phone line or cell phone. With a few tips, it's also easy to tell if someone tapped your phone.

How do digital answering machines work?

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What exactly are the components of a digital answering machine? How does voice get recorded? And then, how is it played back on demand?

How does a long-distance call work?

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Today's computerized long-distance call systems are based on previous technologies. Learn the history of long-distance calling.

How does a self-winding watch work?

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Curious about how a self-winding watch works? Take a look at the mechanics inside a self-winding watch.

How does an EPIRB distress radio work?

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EPIRB helps rescuers locate you in an emergency situation, and these radios have saved many lives since their creation. Find out how EPIRB radios work.