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Project

1-Wire Weather Station

The weather station in this project is quite basic, measuring only temperature, pressure, and humidity, but it may be easily expanded to measure other weather components, such as wind speed and rainfall. The design is based on using a series of…

Project

3D Skull Candy Mold

Whether preparing for Halloween or just a regular day, you can make skull-shaped edibles from this project's 3D candy mold. Like many molds, this one is a hollow container into which you can pour water or hot liquids, such as gelatin, chocolate, or…

Project

3x3x3 LED Cube

LEDs (light-emitting diodes) are rectifying semiconductor devices that convert electrical energy into electromagnetic radiation. You can use these devices to create a 3-dimensional light display. LED cubes require some care and good soldering skills…

Project

Arduino Oscilloscope

An oscilloscope is a device that allows you to see an electronic signal so that it appears as a waveform. Traditional oscilloscopes work by amplifying a signal to control the position of a dot on the y-axis (vertical axis) of a cathode-ray tube…

Project

Chatbot, an Artificially Intelligent Microcontroller

The term "Chatbot" is used for a computer or computer program that is made to emulate some form of human intelligence through conversation. In this project, you will learn how easy it is to make a specific microcontroller—an Arduino™ Uno—seem as…

Project

Laser-Grid Intruder Alarm

This is a working alarm. It uses a laser beam that bounces between mirrors attached to two walls that face each other. The figure to the right has been digitally edited to show the path of the beam. When the beam is broken, a buzzer sounds.This…

Project

Levitation Machine

This project allows you to use electromagnetic levitation to suspend a globe of the world above a surface. The "globe" is actually a table tennis ball painted to look like a globe. Keeping it in place requires careful control of electrical current…

Project

Pulse Generator Circuit

A pulse generator circuit is an important building block for many electronic projects, such as the heart of a digital clock. Its purpose is basically to switch an output on and off for as long as the circuit is activated. Sometimes, these circuits…

Project

Text-Controlled RGB LED

A red, green, and blue (RGB) light-emitting diode (LED) is a useful electronic component that can produce visible light in a variety of colors. This is done by varying the intensity of the light output of the three different color LED elements (red,…

Project

Theremin-like Instrument

A theremin is a musical instrument developed in the 1920s by the Russian inventor, Léon Theremin. It was one of the world's first electronic musical instruments. The original invention used radio-frequency electronics and a pair of antennae. By…

Project

White-Noise Generator

White noise is a smooth hiss consisting of all audio frequencies played back at random simultaneously. Because your ears cannot "lock" onto any specific frequencies or patterns in white noise, this device has the effect of shutting off your ears to…

Project

Constant-Speed Vehicle

Everything in the universe is in motion. One basic, yet important, type of motion is constant-speed motion. This project takes you through assembly of a model battery-powered vehicle that moves at a constant speed. This particular vehicle is built…

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from article Deep inelastic collisions

Deep inelastic collision between an electron and a proton, where the nucleon is viewed either (a) as a blob that breaks up or (b) as composed of quarks, one of which is ejected by elastic scattering with the electron.

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from article Optical prism

Optical prism, consisting of a refracting medium bounded by two surfaces. Dispersion of light into its component colors is shown. (After W. J. Smith, Modern Optical Engineering, 3d ed., SPIE Press–McGraw-Hill, 2000)

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from article Optical prism

System of two Porro prisms, used to invert the image in traditional binoculars. (After R. E. Hopkins and R. Hanau, U.S. Military Handbook for Optical Design, republished by Sinclair Optics, 1987)

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from article Optical prism

Pentaprism, used in single lens reflex cameras. (a) Perspective view, showing how the prism deviates light through an angle of 90° without inverting or reverting the image. (b) Ray diagram. (After R. E. Hopkins and R. Hanau, U.S. Military Handbook…

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from article Optical prism

Set of two thin prisms, known as optical wedges, which can be used as an alignment device. (After P. R. Yoder, Jr., Non-image forming optical components, in Geometrical Optics, SPIE Proc., 531:206–220, 1985)

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from article Barracuda

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from article Circle

A circle, with radius, diameter, and circumference indicated. (Credit: McGraw-Hill Education)

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from article Circle

Nine-point circle and Euler line PMH.

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from article Sonobuoy

Launch of a sonobuoy from an antisubmarine warfare (ASW) aircraft. (a) In flight. (b) Buoy strikes the water in a nearly vertical attitude. (c) Antenna and hydrophone are positioned automatically.

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from article J/psi particle

Online data from August and October 1974, showingexistence of J/psi particle. (After J. J. Aubert et al., Discovery of the new particle, J. Nuc. Phys., B89(1):1–18, 1975)

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from article Goat production

Domesticated goats (Capra hircus) raised for meat goat production. (Photo by Susan Boyer, Agricultural Research Service, U.S. Department of Agriculture)

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from article Goat production

Close-up view of a Saanen goat. (Photo by Milan Kořínek)

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from article Goat production

Mechanical (automatic) milking of a purebred Nigerian Dwarf dairy goat on an elevated stand. (Photo courtesy of Lesa Wilke, Bramblestone Farm, Ohio; www.bramblestonefarm.com)

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from article Trihedron

Trihedron and trihedral angles.

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from article Trihedron

Spherical triangle ABC formed by intersection of sphere with a trihedron. The center of the sphere is at the vertex of the trihedron.

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from article Electric filter

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from article Electric filter

Passive, lumped-element filters. (a) RC low-pass filter. (b) LC band-pass filter.

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from article Electric filter

Ladder structure. (a) Overall structure with alternating series and shunt arms. (b) LC circuit whose impedance contains both a finite-frequency pole and a zero. Such circuits are used in the series and shunt arms of the ladder structure.

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from article Electric filter

Mechanical filter.

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from article Electric filter

Single-amplifier filters. (a) Low-pass Sallen-Key filter. (b) Low-pass, infinite-gain, single-amplifier filter. (c) Cascade of second-order filter realizations.

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from article Electric filter

Multiple-amplifier filters. (a) State-variable (KHN) filter. (b) Tow-Thomas filter.

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from article Electric filter

Simulated-inductor realization of fifth-order high-pass filter. (a) RLC prototype, normalized for cutoff frequency of 1 rad/s (0.159 Hz). (b) Direct active-RC realization.

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from article Satellite television broadcasting

Direct broadcasting television satellite system.

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from article Xenophyophorida

Xenophyophorids. (a) Stannoma dendroides. (b) Stannophyllum zonarium. (c) Psammetta erythrocytomorpha, section showing interlacing tubules and dark inclusions of uncertain nature.

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from article Helmholtz coils

Helmholtz coils, arranged with common axis and connected in series. (After L. B. Loeb, Fundamentals of Electricity and Magnetism, 3d ed., Wiley, 1947)

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from article Helmholtz coils

Separate and combined fields of Helmholtz coils. Note the region of constant resultant field at point P. (After L. B. Loeb, Fundamentals of Electricity and Magnetism, 3d ed., Wiley, 1947)

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from article Fungi

Porcini mushrooms (Boletus edulis) are members of the Basidiomycota division of Fungi. (Credit: Digoarpi/Shutterstock)

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from article Fungi

Spore types (upper illustrations) and structures of parent mycelia (lower illustrations) in fungi.

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from article Fungi

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from article Fungi

Sexual mechanisms in fungi: (a) gametic copulation; (b) gametangial copulation; (c) gamete-gametangial copulation; and (d) somatic copulation.

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from article Fungi

Colorized scanning electron micrograph of brewer's yeast cells (Saccharomyces cerevisiae). This fungus consists of single vegetative cells, and small daughter cells can be seen budding off from the larger cells. Brewer's yeast is used in the…

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from article Apple

Empire apple (Malus pumila). (Credit: Peggy Greb/Agricultural Research Service, United States Department of Agriculture)

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from article Apple

Apple trees in an orchard in late autumn. (Credit: Sandrine Bouvier/Alamy)

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from article Pericycle

Pericycles. (a) Part of transection of root Actaea alba, including xylem and phloem. Pericycle thin-walled and one cell in radial dimension. (b) Part of transection of root of Smilax herbacea, including phloem. Pericycle thick-walled and four or…

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from article Pericycle

Transection of central part of sugarbeet. (After K. Esau, Hilgardia, 9(8), 1935)

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from article Genetically modified organism (GMO)

Transgenic zebrafish cells. Green fluorescent protein (GFP) is a fluorescent protein first discovered in the jellyfish Aequorea victoria. GFP is commonly used as a reporter of gene expression in other species. Here, GFP is expressed by zebrafish…

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from article Genetically modified organism (GMO)

Genome editing technologies. In particular, targeted nucleases are a powerful tool for precise genome editing in GMOs. Among these tools are (a) transcription activator-like effector nucleases (TALENs), (b) zinc-finger proteins (ZFPs), (c) homing…

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from article Wood anatomy

Annual tree rings are distinct features of wood anatomy. The combined concentric bands of light and dark areas can help investigators to determine the age of a tree. (Credit: DrimaFilm/Shutterstock)

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9,572 results

1-Wire Weather Station

3D Skull Candy Mold

3x3x3 LED Cube

Arduino Oscilloscope

Chatbot, an Artificially Intelligent Microcontroller

Laser-Grid Intruder Alarm

Levitation Machine

Pulse Generator Circuit

Text-Controlled RGB LED

Theremin-like Instrument

White-Noise Generator

Constant-Speed Vehicle

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