Vacuum tube
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Vacuum tubes were invented in 1904 by John Ambrose Fleming and were a basic component for electronics throughout the 20th century, enabling technologies like radio, television, radar, and computers. Vacuum tubes work by emitting electrons from a heated cathode through a vacuum and rely on the thermionic and photoelectric effects. Early vacuum tubes included diodes, which could rectify AC, and triodes, which were invented in 1907 by Lee de Forest and added a grid electrode to control current flow. While largely replaced by transistors, vacuum tubes are still used for high-power radio applications due to their efficiency and cost effectiveness.
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Microphones convert sound waves into electrical signals. There are different types that use different transduction methods like electromagnetic induction, capacitance change, or piezoelectric generation. The history of microphones began with devices to amplify voices in ancient Greece. Modern development started with Edison's carbon microphone in the 1870s and includes innovations like condenser, dynamic, ribbon, fiber optic, laser and other microphones. Microphones come in different designs for various applications and convert sound into electrical signals that need amplification before use.
VACCUM TUBE and its work of computer ///
Vacuum tubes were an early electronic device that controlled current flow between electrodes in a glass enclosure from which air was removed, creating a vacuum. Though largely replaced by transistors today, some applications like high power radio transmission still use vacuum tubes. Vacuum tubes have electrodes that emit, attract, or control electron flow. Common types include diodes with two electrodes, triodes with three including a control grid, tetrodes with four including an additional screen grid, and pentodes with five electrodes.
New Technologies
New technologies can transmit signals via wired or wireless methods. Wired transmission uses physical cables like copper wire or optical fiber cables. Copper wire transmits electrical signals but is susceptible to interference, while optical fiber transmits light signals and is immune to interference but more expensive. Wireless transmission uses electromagnetic waves to transmit signals without a physical medium, allowing for mobility but requiring antennas and being impacted by environmental factors. Both wired and wireless methods have advantages and disadvantages depending on the transmission needs and environment.
Wireless charging using microwaves
The document discusses the history and components of wireless power transmission using microwaves. It describes technologies developed at MIT media labs in 1997 to transmit power using electromagnetic waves. It outlines the key parts of wireless power systems including transmitters, receivers, antennas and discusses applications in charging phones and devices without wires. It proposes this as a novel method to deliver power where facilities are not available.
Details on Electronics and communication
The document discusses the history and development of electronics and communication technologies. It describes Maxwell's theory in the 1870s which laid the foundations for radio waves. Practical radio communication required vacuum tubes which were developed in the early 1900s, marking the beginning of electronics. Major developments included the transistor in 1948 which replaced vacuum tubes, and integrated circuits in the 1960s which placed thousands of components on chips. The document also summarizes the major generations of cellular network technology, from 0G to 5G, and their key features and deployment timelines.
Transistor
The document provides information about transistors including their basics, history, comparison to vacuum tubes, and types. It discusses how transistors can amplify and switch electronic signals, and are composed of semiconductor material with at least three terminals. The history outlines how the transistor was invented in 1947 at Bell Labs as an improvement over vacuum tubes, with its smaller size and lower power consumption enabling many electronic devices. Transistors eventually replaced vacuum tubes in most applications. Transistors are also categorized in different ways such as by material, structure, polarity, power rating, and application.
Emt and emc
This document provides an overview of electromagnetic interference (EMI) and electromagnetic compatibility (EMC). It discusses sources of EMI such as atmospheric noise from lightning and clouds. It also describes four coupling mechanisms by which EMI can occur: conductive, capacitive, inductive, and radiative. Techniques for controlling EMI are then outlined, including grounding, shielding, and filtering. Finally, the document discusses methods for EMC testing, including evaluating emissions and susceptibility through radiated field, conducted, and transient immunity testing.
CRT TV Report
The document provides information about cathode ray tubes (CRTs). It discusses how CRTs work by using electron guns and a fluorescent screen to display images. CRTs were largely replaced by newer display technologies like LCD, plasma, and OLED due to lower costs and better features. The document then discusses the history of CRT development and provides details about color CRTs and their operation using three electron guns and phosphors to create color images.
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This document discusses different types of sound sensors and transducers. It describes various audio to electrical sensors including moving coil microphones, moving iron microphones, and capacitor microphones. It explains how these different microphones work by converting sound wave vibrations into electrical signals using mechanisms like a vibrating diaphragm and magnets. The document also covers ultrasonic and infrasound sensors. It provides details on electrical to audio transducers and how speakers convert electrical signals back into sound waves.
Radioonlinereport
The document summarizes a student radio project to build an AM radio receiver and audio amplifier. It describes the components and construction process for each device. Testing showed the radio could receive two stations clearly, though other factors limited reception. The amplifier worked properly when tested separately, showing the goals of understanding radio waves and building functioning devices were achieved.
Gi - The Inventor Of The Tube Amp
The tube amp uses a cathode, grids, and plate to amplify sound through transferring electrons through a vacuum instead of wires. It was invented in 1904 and was used in radios, guitars, microphones, and bass guitars due to its warm tone. The tube inside is called a pentode, which has a cathode that emits electrons, three grids that channel the electrons to create sound, and a plate that absorbs electrons and contains the heat.
Physics 1
The document discusses the flow of information through communication systems. It defines information and the flow of information as the transfer of data from one place to another using electronic and optical equipment. It provides examples of how information is sent through wires, radio waves, optical fibers, and other transmission mediums. The key elements of a communication system are the transmitter, transmission channel, and receiver. The transmitter processes the input signal, the transmission channel sends the signal through a medium like wires or radio waves, and the receiver processes the output signal and delivers it to the destination. Specific examples discussed include how telephone systems work by converting sound vibrations to electrical signals that are transmitted through wires and then back to sound vibrations at the receiving end.
research paper on antenna
An antenna is a specialized transducer that converts radio-frequency (RF) fields into alternating current (AC) or vice-versa. ... At frequencies below 3 GHz, many different types of antennas are used. The simplest is a length of wire, connected at one end to a transmitter or receiver
Wireless driven led semiconductor lightning system
This document discusses wireless power transfer technologies and their application to LED lighting systems. It begins with an introduction to wireless power transfer and wireless-driven LED systems. It then provides background on the history of wireless power by discussing Nikola Tesla's Tesla coil experiments. The document outlines four main methods of wireless power transfer: electromagnetic induction, capacitive coupling, resonant inductive coupling, and microwave transmission. It also discusses LEDs and their advantages for lighting. The document concludes that wireless power techniques have opportunities to make LED products more convenient and reliable compared to traditional wired systems.
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Vacuum tube
- 1. Name: Ahmed Khaled ID: 14105269
- 2. Vacuum Tubes
- 4. invented in 1904 by John Ambrose Fleming vacuum tubes were a basic component for electronics throughout the 20th century diffusion of radio, television, radar, sound recording and digital computers.
- 5. How Vacuum tubes works : Vacuum tubes mostly rely on a cathode heated by the filament is called a thermionic tube or thermionic valve. electron emission through the photoelectric effect.
- 6. Diodes : invented by John Ambrose Fleming could be used as a rectifier of AC and as a radio wave detector
- 7. Triodes : The only one who succeeded was inventor Lee de Forest in 1907. By placing an additional electrode between cathode and anode. the grid was changing the current flowing from the cathode to the Anode
- 8. Used in big radio stations, especially for power levels above 10,000 watts and for frequencies above 50 MHz. High-power TV stations and large FM stations are almost exclusively powered by tubes. The reason is cost and efficiency
- 9. Vacuum tube devices : Cathode ray tubes •Vacuum fluorescent display
- 10. Vacuum tubes using field electron emitters design uses a cold cathode in the form of a large-area field electron source( field emitter array). include much and the ability to provide high power output at low power consumption
- 11. we may find application in : microwave devices including mobile phones for : Bluetooth Wi-Fi in radar and for satellite communication
- 12. Gas-Filled Tube : and operate by ionizing the gas with an applied voltage Ionizing is dependent on the pressure of the fill gas and geometry of the tube
- 13. •Nobel Gases : Helium :is used in helium–neon lasers Neon : Used in fluorescent tubes with high power and short length, e.g. industrial lighting tubes
- 14. References : http://www.vacuumtubes.net/How_Vacuum_Tubes _Work.htm http://www.answers.com/Q/What_is_the_uses_of _triode_transistor