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electronic oscillator
Book article from: The Columbia Encyclopedia, Sixth Edition
electronic oscillator , electronic circuit that produces...signal of a specific frequency. An oscillator generally consists of an amplifier...some cases, a very stable mechanical oscillator, such as a specially prepared quartz...
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oscillator
Book article from: World Encyclopedia
oscillator In physics, a device for producing electrical oscillations (vibrations), such as sound waves, as in a sonar or an ultrasonic generator. In electronics, an oscillator circuit converts direct current (DC) electricity into high-frequency alternating current (AC) .
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Charles Hard Townes
Encyclopedia entry from: Encyclopedia of World Biography
...never be possible to build an ordinary oscillator that would be able to generate radiation...emission in his first attempt to produce an oscillator that would suit his purpose. This phenomenon...emission, to produce a self-excited oscillator that could amplify signals. The molecules...
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radio
Book article from: The Columbia Encyclopedia, Sixth Edition
...carrier wave that has been generated by an oscillator circuit in a transmitter. The modulated...are mixed with a signal from a local oscillator to produce intermediate frequencies...on a radio receiver adjusts the local oscillator frequency. If the incoming signals...
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quantum theory
Book article from: The Columbia Encyclopedia, Sixth Edition
...Max Planck, who proposed that the energies of any harmonic oscillator (see harmonic motion ), such as the atoms of a black body...quantum is directly proportional to the frequency ν of the oscillator, or E = h ν, where h is a constant, now called Planck...
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Aleksandr Mikhailovich Prokhorov
Book article from: The Columbia Encyclopedia, Sixth Edition
...frequency spectroscopy. With N. G. Basov he created an oscillator based on the stimulated emission of electromagnetic waves...In the process of developing an ammonia-beam molecular oscillator, Prokhorov formulated the main principles of, and laid the...
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atomic clock
Book article from: The Columbia Encyclopedia, Sixth Edition
...Instead, the clock is controlled by a highly stable crystal oscillator whose output is automatically multiplied and compared with the frequency of the atomic system. Errors in the oscillator frequency are then automatically corrected. Time is usually...
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maser
Book article from: The Columbia Encyclopedia, Sixth Edition
...of short wavelength, or high frequency. The maser is an oscillator in which the basic frequency control arises from an atomic...for a maser. A maser may be used as an amplifier or as an oscillator, the latter application requiring a higher power level...
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Hewlett, William R
Encyclopedia entry from: Gale Encyclopedia of E-Commerce
...Their first major product was a resistance capacity audio oscillator (HP 200A), essentially a sound equipment testing device...Frederick Terman, encouraged the partners to market the oscillator, and this advice proved well heeded when Walt Disney ordered...
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Taser
Encyclopedia entry from: Encyclopedia of Espionage, Intelligence, and Security
...Stun guns, including the Taser, consist of a transformer, oscillator, capacitor, and electrodes. The transformer generates the voltage; typically between 20,000 and 150,000 volts. The oscillator introduces the pulsations in the electrical charge. The charge...
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