An electronic oscillator is an electronic circuit that produces a periodic, oscillating or alternating current (AC) signal, usually a sine wave, square wave or a triangle wave, powered by a direct current (DC) source. Oscillators are found in many electronic devices, such as radio receivers, television sets, radio and television broadcast transmitters, computers, computer peripherals, cellphones, radar, and many other devices.
Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around 20 kHz to around 300 GHz. This is roughly between the upper limit of audio frequencies and the lower limit of infrared frequencies. These are the frequencies at which energy from an oscillating current can radiate off a conductor into space as radio waves, so they are used in radio technology, among other uses. Different sources specify different upper and lower bounds for the frequency range.
A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio. It uses only the power of the received radio signal to produce sound, needing no external power. It is named for its most important component, a crystal detector, originally made from a piece of crystalline mineral such as galena. This component is now called a diode.
In radio communications, a radio receiver, also known as a receiver, a wireless, or simply a radio, is an electronic device that receives radio waves and converts the information carried by them to a usable form. It is used with an antenna. The antenna intercepts radio waves and converts them to tiny alternating currents which are applied to the receiver, and the receiver extracts the desired information. The receiver uses electronic filters to separate the desired radio frequency signal from all the other signals picked up by the antenna, an electronic amplifier to increase the power of the signal for further processing, and finally recovers the desired information through demodulation.
The following outline is provided as an overview of and topical guide to electrical engineering.
Defence Electronics Research Laboratory (DLRL) is a laboratory of the Defence Research & Development Organization (DRDO). Located in Hyderabad, it is actively involved in the design and development of integrated Electronic Warfare systems for the Indian Armed Forces.
Radio-frequency (RF) engineering is a subset of electronic engineering involving the application of transmission line, waveguide, antenna and electromagnetic field principles to the design and application of devices that produce or use signals within the radio band, the frequency range of about 20 kHz up to 300 GHz.
Otto Julius Zobel was an electrical engineer who worked for the American Telephone & Telegraph Company (AT&T) in the early part of the 20th century. Zobel's work on filter design was revolutionary and led, in conjunction with the work of John R. Carson, to significant commercial advances for AT&T in the field of frequency-division multiplex (FDM) telephone transmissions.
Jabalpur Engineering College (JEC) is an institute located in Jabalpur, Madhya Pradesh, India. It is the oldest technical institution in central India and the 15th-oldest in India. It is the first institute of India to have started the Electronics & Telecommunication engineering education in the country, and also the last educational institution to be set up by the British in India. The Government of Madhya Pradesh is in the process of converting it into a Technical University.
Analogue filters are a basic building block of signal processing much used in electronics. Amongst their many applications are the separation of an audio signal before application to bass, mid-range, and tweeter loudspeakers; the combining and later separation of multiple telephone conversations onto a single channel; the selection of a chosen radio station in a radio receiver and rejection of others.
In signal processing, a filter is a device or process that removes some unwanted components or features from a signal. Filtering is a class of signal processing, the defining feature of filters being the complete or partial suppression of some aspect of the signal. Most often, this means removing some frequencies or frequency bands. However, filters do not exclusively act in the frequency domain; especially in the field of image processing many other targets for filtering exist. Correlations can be removed for certain frequency components and not for others without having to act in the frequency domain. Filters are widely used in electronics and telecommunication, in radio, television, audio recording, radar, control systems, music synthesis, image processing, computer graphics, and structural dynamics.
Electronic(s) engineering is a sub-discipline of electrical engineering which emerged in the early 20th century and is distinguished by the additional use of active components such as semiconductor devices to amplify and control electric current flow. Previously electrical engineering only used passive devices such as mechanical switches, resistors, inductors, and capacitors.
Defence Research and Development Laboratory (DRDL) is an Indian missile development laboratory, part of the Defence Research and Development Organization (DRDO). Their charter is centered on the design, development, and flight evaluation of various types of missile systems for the Indian armed forces. The organization's vision statement reads:
The index of physics articles is split into multiple pages due to its size.
Kunnath Puthiyaveettil Padmanabhan Nambiar DIC (Lond), FIEE (Lond), CEngg (Lond.), more popularly known as K.P.P. Nambiar, was an Indian industrialist and technocrat, known for his work in the field of industrial development and technology. He was awarded Padma Bhushan by Government of India for his contributions to the field of technology in 2006.
Vakkaleri Narayana Rao was an Indian defence scientist and one of the pioneers of Electronic Warfare in India. He was a former director of the Defence Electronics Research Laboratory, Hyderabad. The Government of India awarded him the fourth highest Indian civilian honour of Padma Shri in 1982.
Ramadas Panemangalore Shenoy was an Indian defence scientist and writer, known for his contributions in the field of radar technology. He secured a doctoral degree in electrical engineering from the University of Wisconsin–Madison and joined Defence Research and Development Organization in 1961, involving himself with the indigenous development of radar technology till his retirement, as a Distinguished Scientist, in 1989.
Prof. Ravindra Kumar Sinha is the Vice Chancellor of Gautam Buddha University, Greater Noida, Gautam Budh Nagar Under UP Government. He was the director of the CSIR-Central Scientific Instruments Organisation (CSIR-CSIO) Sector-30C, Chandigarh-160 030, India. He has been a Professor - Applied Physics, Dean-Academic [UG] & Chief Coordinator: TIFAC-Center of Relevance and Excellence in Fiber Optics and Optical Communication, Mission REACH Program, Technology Vision-2020, Govt. of India Delhi Technological University Bawana Road, Delhi-110042, India.
S.V. Chandrashekhar Aiya (1911–1992) was an Indian scientist and engineer who mathematically demonstrated the effect of thunderstorms and lightning on television and radio broadcasting signals.
