On the Origins of AND-Gate Logic

On the Origins of AND-Gate Logic

A Serbian immigrant to the United States, Nikola Tesla is generally recognized as one of the most prolific inventors of all time, having introduced the concept of alternating current (AC), and subsequently designing the first hydroelectric AC power plant installation at Niagara Falls.  Beginning in 1893, Tesla also produced and...

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The Future of the Touchscreen is … Touchless

The Future of the Touchscreen is … Touchless

If seeing is believing, then feeling has got to be downright convincing. But feeling something that really isn’t there? Ultrahaptics brings the long-neglected sense of touch to the virtual world. And now you can add this to your own products and customer experiences. Anyone taking in Disneyland’s 1994 3D attraction,...

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Inside the Leap Motion Mobile VR Platform

Inside the Leap Motion Mobile VR Platform

Virtual and augmented reality (VR/AR) are the next great frontiers in computing. Like the Internet revolution of the 1990s and the mobile revolution of the 2000s, it represents a radical shift in how we live, work, play, learn, and connect. The next major step in this evolution is the second...

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A World of Free Energy

A World of Free Energy

Energy harvesting is the process of collecting of energy from an array of environmental sources, both natural and artificial, most of which is otherwise wasted. These myriad forms of energy include any of those sources through which we can extract electrical current to power any number of low-power devices. The...

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Radio Frequency Modulation Made Easy

Radio Frequency Modulation Made Easy

Modulation is a technique that changes the characteristics of the carrier frequency in accordance to the input signal .  Figure 1.1 shows the conceptual block diagram of a modern wireless communication system. As shown in the figure, modulation is performed at the transmit side and demodulation is performed at...

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An Arduino-based Brain-Computer Interface

An Arduino-based Brain-Computer Interface

Whenever you think a thought—and even when you don’t—the more than one hundred billion neurons making up your brain fire through and across an interconnected web of terminals in an elegant electronic interplay. And at just that moment when the sum of input signals into one neuron crosses a certain...

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Getting Started with Arduino

Getting Started with Arduino

Perhaps the two most popular microcontroller-based systems right now are those based on the Arduino and the Raspberry Pi (RP). While both have huge followings, they are not the same type of microcontroller. The RP is a complete small computer system with most the common add-on features like a keyboard...

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Popular Electronics Classics: Ultrasonic Sniffer

Popular Electronics Classics: Ultrasonic Sniffer

About this March, 1963 feature, Popular Electronics asks, “How would you build this circuit today?” Share your ideas in the discussion section. Note also that we’ve retained the old conventions used in the original, e.g., kc versus MHz, μμf versus pf, r.f. versus RF, etc. *** Here’s an old circuit with a...

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Teslapathic: Mind Control for your Car

Teslapathic: Mind Control for your Car

The notion of brain waves being able to exert sufficient energy to influence objects would involve nothing short of a miracle—especially considering that the radiance of the wimpy signals emitted by neural activity don’t extend beyond a few millimeters from the skull. Spoon benders need not apply. But moving a...

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Pulse Modulation

Pulse Modulation

Publisher’s Note: To complement Dr. Saleh Faruque’s feature story providing an introduction to RF modulation, as well as Casey Spencer’s feature, Teslapathic, which employs pulse position modulation (PPM), we dug into our archives at Popular Electronics and discovered this terrific introduction to pulse modulation, of which PPM is a variant....

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