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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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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Introducing viciLogic

Introducing viciLogic

Initiatives such as Codecademy, Khan Academy, Coder Dojo, Microsoft TEALS, Arduino, Raspberry Pi, micro:bit, and others have stimulated a great deal of interest and activity in Computer Science (CS) and Application Programming (AP). Engaging and enabling a global community, and in particular, a significant young audience, is surely leading to...

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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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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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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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POP: The Programmable Open Pedal

POP: The Programmable Open Pedal

As an engineer and amateur guitar player, I was looking for a device that allowed me to design my own sound effects and combine them, at a reasonable price. There are a number of amazing pedals and pedalboards out there; their prices are fair, and I would certainly like to...

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What Lies Beneath

What Lies Beneath

The Hill of Tara is a grand stage, an ancient host of a mélange of ritual performances played out over millennia—perhaps 4,000 years or more—spanning the Neolithic to the early Christian period. Throughout its occupation, each incarnation of beliefs and practices subsumed into its worldview the expression of the former...

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Inside the Fluxgate Gradiometer

Inside the Fluxgate Gradiometer

This article aims to describe in simple terms how a fluxgate operates, its use as a component in a gradiometer or on its own simply to measure the Earth’s or other similarly low magnetic field. There is no such thing as a definitive fluxgate design, there being many variants, each...

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