Showing posts with label electronics. Show all posts


When you think of Animatronics,you may flash to the janky mechanical pizza parlor bands of your youth, or maybe a stiff row of founding fathers that your parents made you go see even though the rest of Disneyland was literally right there.

But the field of animatronics has come a long way from its pneumatic roots. Now the world’s largest animatronics company, Garner Holt Productions is pushing its creations into more realistic and more diverse dimensions, moving us closer to an age where interacting with life-like robots is the norm.
Animatronics are robots that are meant to simulate some kind of life, and in many ways, it is the industry most likely to give the world the type of human-like robots often seen in science fiction. Aside from the occasional Boston Dynamics robo-beast, many non-industrial, research robots are created to run for a short time in lab conditions, and demonstrate a single task. Animatronics are often asked to do much more.
“In our world, we’ve got to make stuff that works for 12-16 hours a day, every single day,” says Bill Butler, Director of Creative Design for Garner Holt Productions. “Typically, we design things for a 20-year service life, minimum. But there are some animatronics at Disney theme parks that are 50 years old, and they’re still running.”  
The Garner Holt company was founded back in 1977 by Garner Holt himself, when he was just 16, working out of his garage. “I started back in 1976-77, and there weren’t really any schools that had anything related to robotics like there is now,” says Holt, who still works at the company. “I was pretty much self-taught with books and trial and error.”

From his Apple-esque garage tinkerings, Holt began creating animatronic features for haunted houses and trade show exhibits, until he was able to begin creating the kind of animatronics he wanted. “I started out with birds, and we just got bigger and bigger and more elaborate,” says Holt.
His company then began working on parade floats and theme park attractions at places like the MGM Theme Park in Las Vegas (now defunct), and the Knott’s Berry Farm amusement park in California. Eventually they started doing work for Disney parks and even the military. Now, just a year shy of their 40th anniversary, Garner Holt Productions is the world leader in animatronic technology, and one of the primary providers of animatronics to Disney and Universal theme parks around the world.  
As the industry has grown over the years, Garner Holt Productions has worked on an incredibly diverse number of animatronic projects. They’ve created everything from animatronic chandeliers for a grocery store chain to robotic presidents to all of the animated features at Michael Jackson’s Neverland Ranch. Recently they’ve made full-size versions of Thomas the Tank Engine characters with moving, expressive faces, and almost 500 automated Chuck E. Cheese bands for franchises all over the world.
Nowadays, the company creates a relatively even split of human figures and fantasy characters, and according to Holt, it’s this diversity that keeps the job interesting. “Just about the time you’re getting tired of building Thomas Jefferson, somebody comes along with a 40-foot fire-breathing dragon,” he says. “Then about the time you’re tired of building dinosaurs, somebody comes in with a Marilyn Monroe.”
It is also this diversity that keeps the company innovating. “We’re the only animatronics company in the world that maintains a research and development department,” says Butler. For most of their history, animatronic figures have run on hydraulic and pneumatic systems that gave them a limited amount of movement and expression. But as Holt explains, the rise of computer technology, and the development of smaller, lighter, quieter motors, has allowed the animatronics industry to take on new levels of dynamic realism.
“In the past probably the average was seven to eight functions in a figure, now we have figures that are up to 150 different functions,” says Holt. “We have a figure here, a yeti, that has up to 150 different moves. We have a human character that has 120 different functions.” Garner Holt now works with motion capture, CGI modeling, and facial recognition programs to create more and more uncanny creations.
This increased range of realism and interactivity has also opened the doors to what purpose their creations can serve. For instance, their yeti character, which was created in-house for research purposes as opposed to being requested by a client, may have applications in interacting with the hearing impaired.
“His hands are so complex that we’ve experimented with actually performing sign language with hearing impaired children,” says Holt. The seven-and-a-half foot tall beast (which Holt compares to Harry from the ’80s film Harry and the Hendersons), is such a hit with kids, that Holt hopes it might even be used to interact with children with autism.
Garner Holt Productions’ work with the military on training animatronics is also resulting in some amazingly versatile creations. The company has been creating animated figures for the Infantry Immersion Trainer at California’s Camp Pendelton for years. The mixed reality training course simulates a third world village complete with sounds and smells. It is populated by role-playing humans and animatronic figures, which stand in as both civilians and enemy combatants.
Just six months ago, Garner Holt Productions was able to upgrade many of the figures to make them more life-like than ever. Holt told us that now some of the characters can actually shoot non-lethal guns, and even throw grenades, as well as react to being shot. “You can shoot them, and if the bullet hits them in the head or the chest, they’ll double over and fall on the ground,” he says. “When the group leaves, they’ll stand back up and dust themselves off and be ready to engage again.”
One of the fields in which Garner Holt spends a great deal of research is in creating life-like facial expressions on their characters, which has also improved their military simulation figures. “We’ve been doing a lot with expressive facial technologies to where we are creating human heads that look just like a real human head does,” says Holt. “With all the different expression, the smiles and frowns, and enunciating the words, and all of that type of thing.” Some of the figures in the Immersion Trainer will appear to be civilians until the trainee speaks with them, and then their expression will change to indicate hostility. 
Maybe they’ll even reveal a hidden weapon While animatronics is still largely the domain of the amusement industry, these new applications seem to be just the first steps in how the technology can be used to usher in a wider use of life-like robotics. “We enjoy looking at what we can do that will change our industry, that can go in different directions,” says Holt. “When I started in animatronics 40 years ago, I thought that I’d probably be building birds in the garage the rest of my life. I didn’t really realize that I’d be training soldiers, and possibly helping people train to be nurses and doctors using our animations.”
But even with all of these innovative uses for animatronic technology, Garner Holt Productions is still firmly invested in creating amazing amusement park attractions. For the Disney parks alone, they company has recently replaced the famous snow man in Disneyland’s Matterhorn ride with a newer, more versatile model. Just this week it was revealed that they will be bringing Sally from A Nightmare Before Christmas to life for the first time as part of the Haunted Mansion’s Halloween makeover. The details and innovations of high profile creations such as those for the Disney parks, have to be kept tightly under wraps. When asked whether they would have a hand in creating the recently announced Star Wars attractions at the Disney parks, Butler responded, “What Star Wars attraction?”
Whether they’re in Star Wars or real wars, animatronics will probably only prove to be more remarkable and versatile in the years to come if Garner Holt Productions has anything to say about it.

Here’s an electronic watchdog for your house that sounds to inform you that somebody is at the gate. The circuit comprises a transmitter unit and a receiver unit, which are mounted face to face on the opposite pillars of the gate such that the IR beam gets interrupted when someone is standing at the gate or passing through it. The transmitter circuit (see Fig. 1) is built around timer NE555 (IC1), which is wired as an astable multivibrator producing a frequency of about 38 kHz. The infrared (IR) beam is transmitted through IR LED1.

                                          
                                                        Fig. 1: 38kHz IR transmitter circuit

The receiver circuit is shown in Fig. 2. It comprises IR sensor TSOP1738 (IR RX1), npn transistor BC548 (T1), timer NE555 (IC2) and some resistors and capacitors. IC2 is wired as a monostable multivibrator with a time period of around 30 seconds. The melody generator section is built around melody generator IC UM66 (IC3), transistor T2 and loudspeaker LS1. 

                       
                                                              Fig. 2: Receiver circuit
 

Fig. 3 shows pin configurations of IR sensor TSOP1738 and melody generator IC UM66. The power supply for the transmitter is derived from the receiver circuit by connecting its points A and B to the respective points of the receiver circuit. The receiver is powered by regulated 6V DC. For the purpose, you can use a 6V battery.


                                                         
                                                                                           
                                                                                     
  








Fig. 3:  Pin configurations of TSOP1738 and UM66  


 The transmitter and receiver units are aligned such that the IR beam falls directly on the IR sensor. As long as IR beam falls on the sensor, its output remains low, transistor T1 does not conduct and trigger pin 2 of IC2 remains high. When anyone interrupts the IR beam falling on the sensor, its output goes high to drive transistor T1 into conduction and pin 2 of IC2 goes low momentarily. As a result, IC2 gets triggered and its pin 3 goes high to supply 3.3V to melody generator IC3 at its pin 2, which produces a sweet melody through the speaker fitted inside the house. Output pin 3 of IC2 remains high for around 30 seconds.


                                           
                                   Fig. 4: Mounting arrangement for transmitter and receiver units

Fig. 4 shows mounting arrangement for both the transmitter and receiver units on the gate pillars. To achieve a high directivity of the IR beam towards the sensor, use a reflector behind the IR LED. After both the units have been built, connect 6V power supply to the receiver circuit. You should hear a continuous melody from the speaker. Now connect 6V power to the transmitter also and orient IR LED1 towards IR receiver. The melody should stop after about 30 seconds. Now the transmitter and the receiver units are ready for use. When somebody enters through the door, the IR beam is interrupted and the alarm sounds for 30 seconds. The alarm keeps sounding as long as one stands between the transmitter and receiver units.

Using preset VR1, you can set the volume of the loudspeaker. This circuit can also be used as a doorbell or burglar alarm.




Touch screen technology is the direct manipulation type gesture based technology. Direct manipulation is the ability to manipulate digital world inside a screen. A Touch screen is an electronic visual display capable of detecting and locating a touch over its display area. This is generally referred to as touching the display of the device with a finger or hand. This technology is most widely used in computers, user interactive machines, smart phones, tablets etc to replace most functions of the mouse and keyboard.
Touch screen technology has been around for a number of years but advanced touch screen technology has come on in leaps and bounds recently. Companies are including this technology into more of their products. The three most common touch screen technologies include resistive, capacitive and SAW (surface acoustic wave). Most of low end touch screen devices contain on a standard printed circuit plug-in board and are used on SPI protocol. The system has two parts, namely; hardware and software. The hardware architecture consists of a stand-alone embedded system using an  8-bit microcontroller,  several type of interface and driver circuits. The system software driver is developed using an interactive C programming language.

Types of Touch Screen Technology:

The Touch screen is a 2-dimensional sensing device made of 2 sheets of material separated by spacers. There are four main touch screen technologies: Resistive, Capacitive, Surface Acoustical wave (SAW) and infrared (IR).
Resistive:
Resistive touch screen is composed of a flexible top layer made of polythene and a rigid bottom layer made of glass separated by insulating dots, attached to a touch screen controller. Resistive touch screen panels are more affordable but offering only 75% of light monitor and the layer can be damaged by sharp objects. Resistive touch screen is further divided into 4-, 5-, 6-, 7-, 8- wired resistive touch screen. The construction design of all these modules is similar but there is a major distinction in each of its method to determine the coordinates of touch.
Capacitive:
A capacitive touch screen panel is coated with a material that stores electrical charges. The capacitive systems can transmit up to 90% of light from the monitor. It is divided into two categories. In Surface-capacitive technology only one side of the insulator is coated with a conducting layer.
Whenever a human finger touches the screen, conduction of electric charges occurs over the uncoated layer which results in the formation of dynamic capacitor. The controller then detects the position of touch by measuring the change in capacitance at the four corners of the screen.
In projected capacitive technology, the conductive layer (Indium Tin Oxide) is etched to form a grid of multiple horizontal and vertical electrodes. It involves sensing along both the X and Y axis using clearly etched ITO pattern. For increasing the accuracy of the system, the projective screen contains a sensor at every interaction of the row and column.
Infrared:
In infrared touch screen technology, an array of X and Y axis is fitted with pairs of IR Leds and photo detectors. Photo detectors will detect any image in the pattern of light emitted by the Leds whenever the user touches the screen.
Surface Acoustic wave:
The surface acoustic wave technology contains two transducers placed along X-axis and Y-axis of the monitor’s glass plate along with some reflectors. When the screen is touched, the waves are absorbed and a touch is detected at that point. These reflectors reflect all electrical signals sent from one transducer to another. This technology provides excellent through put and quality.

Components and working of touch screen:

A basic touch screen is having a touch sensor, a controller, and a software driver as three main components. The touch screen is needed to be combined with a display and a PC to make a touch screen system.
Touch sensor:
The sensor generally has an electrical current or signal going through it and touching the screen causes a change in the signal. This change is used to determine the location of the touch of the screen.
Controller:
A controller will be connected between touch sensor and PC. It takes information from sensor and translates it for understanding of PC. The controller determines what type of connection is needed.
Software driver:
It allows computer and touch screen to work together. It tells OS how to interact the touch event information that is sent from the controller.The touch screen is one of the simplest PC interfaces to use, for larger number of applications. A touch screen is useful for easily accessing the information by simply touching the display screen. The touch screen device system is useful in ranging from industrial process control to home automation.
At the transmission end using a touch screen control unit, some directions will send to the robot for moving into a specific direction like forward, backward, rotating left and rotating right. At the receiving end four motors are interfaced with the microcontroller. Two of them will be used for Arm and grip movement of the robot and other two are used for body movement.
Some remote operations can be done with touch screen technology using wireless communication for answering calls, locating and communicating with staff, and operating vehicles and robots. For this purpose RF communication or infrared communication may be used.


Energy efficient wireless communication network design is an important and challenging problem. It is important because mobile units operate on batteries with energy supply. It is challenging because there are many different issues that must be dealt with when designing a low energy wireless communication system (such as amplifier design, coding, and modulation design), and these issues are coupled with one another.

Furthermore, the design and operation of each component of a wireless communication system present trade-offs between performance and energy consumption.
Therefore, the challenge is to exploit the coupling among the various components of a wireless communication system, and understand trade-offs between performance and energy consumption in each individual component, in order to come up with an overall integrated system design that has optimal performance and achieves low energy (power). 

The key observation is that constraining the energy of a node imposes a coupling among the design layers that cannot be ignored in performing system optimization. In addition, the coupling between layers requires simulation in order to accurately determine the performance. The purpose of this power is to present a methodology for the design, simulation and optimization of wireless communication networks for maximum performance with an energy constraint.

Before we proceed, we illustrate, through simple examples, a couple of issues that need to be addressed. To highlight the trade-offs between performance and energy consumption at individual components, consider the design and operation of an amplifier. The amplifier boosts the power of the desired signal so that the antenna can radiate sufficient power for reliable communications. However, typical power amplifiers have maximum efficiency in converting DC power into RF power when the amplifier is driven into saturation. In this region of operation, the amplifier voltage transfer function is nonlinear.

Because of this non linearity, the amplifier generates unwanted signals (so called intermodulation products) in the band of the desired signal and in adjacent bands. When the amplifier drive level is reduced significantly (large back off) the amplifier voltage transfer characteristic becomes approximately linear. In this case it does not generate intermodulation products. However, with large back off the amplifier is not able to efficiently convert DC power into RF power. Thus, there is considerable wasting of power at low drive levels, but at high drive levels more interfering signal are generated.

To highlight the coupling among the design of individual components of a wireless system, consider packet routing in a wireless network that contain no base station (i.e. an ad hoc network). For simplicity consider a network with nodes A, B and C shown in figure. If Node A wants to transmit a message to Node C, it has two options. Transmit with power sufficient to reach Node C in a single transmission, or transmit first from A to B with smaller power, and then B to C. since the received signal power typically decays with distance as d4, there is significantly smaller power loss due to propagation in the second option because d^4ac>d^4ab+d^4bc.however even though Node A transmits with smaller output power, it does not necessarily proportionally decreases the amount of actually consumed because of the amplifier's effect discussed above.

Furthermore, besides the energy required for packet transmission, there are energy requirements for packet reception and information decoding. The probability of packet error reception that is achieved depends on energy allocated to the receiver. Consequently, there is a coupling among amplifier design, coding and modulation design, and decoding design as well as routing protocol.

A  smart note taker is mostly used in places such as NPTEL lectures. "Smart Note Taker " is the technology that satisfies the needs of people who want to take fast and easy notes. In this article, I am going to publish What is Smart Note Taker and where we can use it in a detailed manner.


Explanation of Smart Note Taker: 

The smart note taker provides facility to people who want to make notes quickly. It can be used in many ways.
    • This technology provides the people a facility of writing notes in air while being busy in their work.
    • The written notes are stored in the memory chip of pen and will be able to read in digital medium after the conversation.

    • This reduces the time and facilitates life..

Applications of Smart Note Taker:

    • Apart from this it is also proved to be very useful for blinds who think and write freely.
    • It is also very useful in telephonic conversations between two people where there is a need of note taking.

    • It’s also useful especially for instructors in presentations.The instructors may not want to present the lecture in front of the board. The drawn figure can be processed and directly sent to the server computer in the room.
        • The server computer then can broadcast the drawn shape through network to all of the computers which are present in the room.
        • Through this way, the lectures are aimed to be more efficient and fun. This product will be simple but powerful.




Mobile communication technology includes devices such as cellular phones, Wi-Fi-enabled hand-held devices and wireless laptops that can connect through Wi-Fi or with a cellular connection. Consumers envision the benefits of these kinds of devices before purchasing them and sign a provider carrier contract. But it is important to understand the advantages and disadvantages of mobile communication technology before getting involved in a long-term agreement.

Emergencies

A mobile communication device can be helpful in case of an emergency. If emergency authorities are needed, then the cellular phone can be used to contact them. Communications devices with built-in digital phones can be used to catalog the events at the scene of an accident to help determine responsibility and assess damage. Hikers can take mobile communication devices with them and use the GPS tracking system to find their way, or call for help if needed.

Sharing Information

The Internet has helped broaden communication channels by connecting people all over the world through a single computer network. But before the development of mobile communication devices, the information still needed to be transported back to a computer before it could be sent out over the Internet. With hand-held communications devices, business professionals can instantly share information with clients and vendors regardless of where they are, and friends can share photographs and messages instantly without having to wait until they are logged in to a computer.

Safety Concerns

The use of mobile communication devices can be dangerous. A 2006 Pew Research Center study published on its website indicated that 32 percent of men and 25 percent of women surveyed indicated that they do not drive as safely as they could because of hand-held communication device distractions. Driving a car or safely crossing the street can become difficult when a communication device is causing a distraction.

Less Down Time

Because many business professionals are connected to clients and business associates through cellular devices, there is no down time anymore. Business managers, small business owners and professionals are always on call to clients because of the ability of clients to reach business professionals through cellular phone calls, texting or emails. The same mobile communication tools that can make business easier, can also make business a burden when they take away time off.


Electronic devices and gadgets require a power supply (either AC or DC), this power supply can be taken directly from the mains power supply or from the electrical batteries. The battery can be defined as an electronic device comprised of (one or more) electrochemical cells. The chemical energy of the electrochemical cells can be converted into electrical energy. Based on different criteria batteries are classified into various types such that based on rechargeable condition they are classified as rechargeable batteries and non-rechargeable batteries. The advancement in technology developed environment friendly and more flexible batteries such as paper batteries. In this article, let us discuss about paper battery construction and working. But, primarily, we must know what a paper battery is.

Paper Battery

The flexible and thin energy storage device which can be used as a battery is called as paper battery. This paper battery can also be used as a capacitor. This battery can be produced by merging the nanotubes (made using carbon) and nano-composite paper (made using cellulose). The paper battery consists of property of a battery – high-energy storage capacity and property of super capacitor – high-energy density and thus, produces extreme power.

Paper Battery Construction

The major components used for the construction of paper battery include:
  • Carbon Nanotube (CNT) used for cathode terminal
  • Lithium metal (Li+) used for anode terminal
  • Different types of electrolytes that include blood, urine, and sweat (which are termed as bio-electrolytes)
  • Paper (Cellulose-Separator)

7-Simple Steps for the Construction of Paper Battery

Step 1: Take a cellulose-based paper and apply black carbon ink on it
Step2:  Spread this ink applied on the paper
Step3: After spreading ink, laminate a thin film over the cellulose surface
Step4: Heat the cellulose paper for 5min at 80 degrees C
Step5: Then, peel off the film from the substrate
Step6: The electrodes of paper battery are formed by film. The electrolytes LTO and LCO are connected to different films
Step7: The functioning of paper battery can be checked by connecting battery terminals to the LED

Paper Battery Working

The conventional rechargeable batteries which we use in our day-to-day life consist of various separating components which are used for producing electrons with the chemical reaction of a metal and electrolyte. If once the paper of the battery is dipped in ion-based liquid, then the battery starts working i.e., electricity is generated by the movement of electrons from cathode terminal to anode terminal. This is due to the chemical reaction between the electrodes of paper battery and liquid. Due to the quick flow of the ions within a few seconds (10sec) energy will be stored in the paper-electrode during the recharging. By stacking various paper-batteries up on each other, the output of the paper battery can be increased.
As the paper batteries are connected each other very closely for increasing their output, there is chance of occurring short between the anode terminal and cathode terminal. If once the anode terminal contacts with cathode terminal, then there will be no flow of current in the external circuit. Thus, to avoid the short circuit between anode and cathode a barrier or separator is needed, which can be fulfilled by the paper separator.
Paper Battery= Paper (Cellulose) + Carbon Nanotubes
The paper battery can be used for various applications as it facilitates advantages such as folding, twisting, molding, crumpling, shaping, and cutting without affecting on its efficiency. As the paper batteries are the combination of cellulose paper and carbon nanotubes, which facilitates advantages of long term usage, steady power, and bursts of energy. These types of paper batteries are estimated to use for powering the next generation vehicles and medical devices.

Paper Battery Properties

The properties of paper battery can be recognized from the properties of cellulose such as excellent porosity, biodegradability, non-toxic, recyclability, high-tensile strength, good absorption capacity, and low-shear strength and also from the properties of carbon nanotubes such as low mass density, flexibility, high packing density, lightness, better electrical conductivity than silicon, thin (around 0.5 to 0.7mm), and low resistance.

Advantages of Paper Battery

  • Unlike the conventional batteries, paper battery can be used by folding, cutting, and rolling.
  • Paper battery functions as a battery as well as a capacitor.
  • Paper battery is a modern storage device with ultra-thin in size.
  • It has special properties such as more economical, biodegradable, and bio-compatible.
  • Paper battery can generate electrical energy of 1.5V.
  • The output voltage of paper battery can be customized based on requirement.

Disadvantages of Paper Battery

  • The carbon nanotubes used in paper battery are very expensive.
  • The paper battery wastage may damage lungs if it is inhaled.
  • The e-wastage is generated by paper batteries.

Applications of Paper Battery

There are numerous applications for paper batteries in various fields. In electronics, paper battery is typically used in mobiles, laptops, calculators, cameras, mouse, keyboard, Bluetooth devices, and so on. Similarly, in medical sciences for artificial tissues, cosmetics, drug delivery systems, and so on. In automobiles and aircraft, paper batteries are used in hybrid vehicles because of their light weight.



A processor, or "microprocessor," is a small chip that resides in computers and other electronic devices. Its basic job is to receive input and provide the appropriate output.The central processor of a computer is also known as the CPU, or "central processing unit." This processor handles all the basic system instructions, such as processing mouse and keyboard input and running applications. Modern CPUs often include multiple processing cores, which work together to process instructions. While these "cores" are contained in one physical unit, they are actually individual processors. 

Processor speed :


A Processor provides the instruction that multiple application processes need to perform their jobs.The faster it does that, the faster a computer operates.


Clock Speed :


It may be tempting to buy a processor because it advertises a fast clock speed. However, clock speed, as Computer Shopper notes, “is only marginally useful in gauging how ‘fast’ a CPU really is.” That’s because a chip’s architecture, cache and other factors also influence your computing speed. Clock speed refers to the number of cycles that a processor executes per second. A cycle is a unit of measurement during which a processor executes instructions. If you see a processor that has a rating of 3.1 GHz, it operates at 3.1 billion cycles per second.

Cores vs. Speed


A processor’s core count can be more important than its speed. A dual-core chip consists of two processors while a quad-core chip contains four. You’ll find a quad-core chip useful if you like to run multiple applications at once or run programs designed to take advantage of four cores. Like their single-core counterparts, multi-core processors also perform faster when they have higher clock speeds.


There are numerous basic electronic components that are used for building electronic circuits. Without these components, circuit designs are never complete or didn’t function well. These components include resistors, diodes, capacitors, integrated circuits, and so on. Some of these components consists of two or more terminals which are soldered to circuit boards. Some may be packaged type like integrated circuits in which different semiconductor devices are integrated.


Basic Electronics Components
An electronic circuit comprises of various types of components, which are classified into two types: active components like transistors, diodes, IC’s; and passive components like capacitors, resistors, inductors, etc.
In designing of an electronic circuit following are taken into consideration:
·         Basic electronic components: capacitors, resistors, diodes, transistors, etc.

·         Power sources: Signal generators and DC power supplies.

·         Measurement and analysis instruments: Cathode Ray Oscilloscope (CRO), multimeters, etc.

Passive Electronic Components
These components can store or maintains energy either in the form of current or voltage. Some of these components are discussed below.
Resistors
A resistor is a two-terminal passive electronics component, used to oppose or limit the current. Resistor works based on the principle of Ohm’s law which states that “voltage applied across the terminals of a resistor is directly proportional to the current flowing through it”
V=IR
The units of the resistance is ohms
Where R is the constant called resistance
Resistors
Resistors are further classified based on the following specifications such as the power rating, type of material used and resistance value. This resistor types are used for different applications.
Fixed resistors:
This type of resistor is used to set the right conditions in an electronic circuit. The values of resistance in fixed resistors are determined during the design phase of the circuit, based on this there is no need to adjust the circuit.
Variable resistors:
A device that is used to change the resistance according to our requirements in an electronic circuit is known as a variable resistor. These resistors comprise of a fixed resistor element and a slider which taps on to the resistor element. Variable resistors are commonly used as a three terminal device for calibration of the device.
Capacitors:
A capacitor made from two conductive plates with an insulator between them and it stores electrical energy in the form of an electric field. A capacitor blocks the DC signals and allows the AC signals and also used with a resistor in a timing circuit.
The stored charge is Q=CV
Where
C is the capacitance of a capacitor and
V is the applied voltage.
Capacitors
These capacitors are different types like film, ceramic, electrolytic and variable capacitors. For finding its value number and color coding methods are used and it also possible to find the capacitance value with LCR meters.
Inductors
An inductor is also referred as AC resistor which stores electrical energy in the form of magnetic energy. It resists the changes in the current and the standard unit of inductance is Henry. Capability of producing magnetic lines is referred as inductance.
The inductance of the inductor is given as L= (µ.K.N2.S)/I.
Where,
L is inductance,
µ is Magnetic permeability,
K is magnetic coefficient,
S is theCross section area of the coil,
N is the Number of turns of the coils,
And I is the Length of the coil in axial direction.
Inductors
Other passive electronic components include different types of sensors, motors, antennas, memristors, etc. To reducing the complexity of this article few of the passive components are discussed above.

Active Electronic Components
These components rely on a source of energy and are able to control the electron flow through them. Some of these components are semiconductors like diodes, transistors, integrated circuits, various displays like LCD, LED, CRTs and power sources like batteries, PV cells and other AC and DC supply sources.
Diodes
A diode is a device that allows current to flow in one direction and usually made with semiconductor material. It has two terminals, anode and cathode terminals. These are mostly used in converting circuits like AC to DC circuits. These are are of different types like PN diodes, Zener diodes, LEDs, photo diodes, etc.
Diodes

Transistors
A transistor is a three terminal semiconductor device. Mostly it is used as switching device and also as an amplifier. This switching device can be a voltage or current controlled.By controlling the voltage applied to the one terminal controls the current flow through the other two terminals. Transistors are of two types, namely bipolar junction transistor (BJT) and field effect transistors (FET). And further these can be PNP and NPN transistors.
Transistors
Transistors

Integrated Circuits
An Integrated circuit is a special component which is fabricated with thousands of transistors, resistors, diodes and other electronic components on a tiny silicon chip. These are the building blocks of current electronic devices like cell phones, computers, etc. These can be analog or digital integrated circuits. Mostly used ICs in electronic circuits are Op-amps, timers, comparators, switches ICs and so on. These can be classified as linear and nonlinear ICs  depending on its application.
Integrated Circuits
Integrated Circuits

Display Devices
LCD: A liquid crystal display (LCD) is a flat display technology, which is mostly used in applications like computer monitors, cell phone display, calculators, etc. This technology uses two polarized filters and electrodes for selectively disable or enable the light to pass from reflective backing to the eyes of the viewer.
LCD
LCD

CRT:
Cathode ray tube display technology is mostly used in televisions and computer screens that works on the movement of an electron beam back and forth on the back of the screen. This tube is an elongated vacuum tube in which flattened surface has external components as electron gun, electron beam and a phosphorescent screen.
Cathode Ray Tube
Cathode Ray Tube

Batteries
Batteries are most common power source for standalone industrial, domestic and handheld device applications. It converts chemical energy into electrical energy through electrochemical discharge reactions. These consist of one or more cells and each cell contains an anode, cathode and the electrolyte. The battery cells are classified into two types namely primary cells and secondary cells. The primary cells are not of rechargeable type but the secondary cells cab be rechargeable.
BatteriesBatteries


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