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- Carbon_microphone abstract "The carbon microphone, also known as carbon button microphone, button microphone, or carbon transmitter, is a type of microphone, a transducer that converts sound to an electrical audio signal. It consists of two metal plates separated by granules of carbon. One plate is very thin and faces outward, acting as a diaphragm. When sound waves strike this plate, the pressure on the granules changes, which in turn changes the electrical resistance between the plates. Higher pressure lowers the resistance as the granules are pushed closer together. As a steady direct current is passed between the plates, the varying resistance results in a modulation of the current at the same frequency of the impinging sound waves. In telephony, this signal is directly passed through a telephone system to the central office, or it is electronically amplified in other sound systems, such as a public address system or a recording device. The frequency response of the carbon microphone, however, is limited to a narrow range, and the device produces significant electrical noise.Before the proliferation of vacuum tube amplifiers in the 1920s, carbon microphones were the only practical means of obtaining high-level audio signals, and were widely used in telephone systems. Their low cost, inherently high output and peaked frequency response characteristic were well suited for this application. Their use in new telephone installations continued into the 1980s, long after they had been replaced by other types of microphones in other applications. In most plain old telephone service (POTS) networks, carbon-microphone based telephones can still be used without modification. Carbon microphones, usually modified telephone transmitters, were widely used in early AM radio broadcasting systems, but their limited frequency response, as well as a fairly high noise level, led to their abandonment in those applications by the late 1920s. They continued to be widely used for low-end public address, and military and amateur radio applications for some decades afterward.".
- Carbon_microphone thumbnail Carbon_Button_Microphone.JPG?width=300.
- Carbon_microphone wikiPageExternalLink chap36.html.
- Carbon_microphone wikiPageID "5238485".
- Carbon_microphone wikiPageRevisionID "605948240".
- Carbon_microphone hasPhotoCollection Carbon_microphone.
- Carbon_microphone subject Category:American_inventions.
- Carbon_microphone subject Category:History_of_the_telephone.
- Carbon_microphone subject Category:Microphones.
- Carbon_microphone subject Category:Thomas_Edison.
- Carbon_microphone type Amplifier102705944.
- Carbon_microphone type Artifact100021939.
- Carbon_microphone type AudioAmplifier102756854.
- Carbon_microphone type AudioAmplifiers.
- Carbon_microphone type Device103183080.
- Carbon_microphone type ElectricalDevice103269401.
- Carbon_microphone type Electro-acousticTransducer103274561.
- Carbon_microphone type ElectronicEquipment103278248.
- Carbon_microphone type Equipment103294048.
- Carbon_microphone type Instrumentality103575240.
- Carbon_microphone type Microphone103759954.
- Carbon_microphone type Microphones.
- Carbon_microphone type Object100002684.
- Carbon_microphone type PhysicalEntity100001930.
- Carbon_microphone type Transducer104470953.
- Carbon_microphone type Whole100003553.
- Carbon_microphone comment "The carbon microphone, also known as carbon button microphone, button microphone, or carbon transmitter, is a type of microphone, a transducer that converts sound to an electrical audio signal. It consists of two metal plates separated by granules of carbon. One plate is very thin and faces outward, acting as a diaphragm. When sound waves strike this plate, the pressure on the granules changes, which in turn changes the electrical resistance between the plates.".
- Carbon_microphone label "Carbon microphone".
- Carbon_microphone label "Kohlemikrofon".
- Carbon_microphone label "Koolmicrofoon".
- Carbon_microphone label "Microphone à charbon".
- Carbon_microphone label "Micrófono de carbón".
- Carbon_microphone label "Угольный микрофон".
- Carbon_microphone label "碳粒式麥克風".
- Carbon_microphone sameAs Kohlemikrofon.
- Carbon_microphone sameAs Micrófono_de_carbón.
- Carbon_microphone sameAs Microphone_à_charbon.
- Carbon_microphone sameAs Koolmicrofoon.
- Carbon_microphone sameAs m.0d9fkw.
- Carbon_microphone sameAs Q1482299.
- Carbon_microphone sameAs Q1482299.
- Carbon_microphone sameAs Carbon_microphone.
- Carbon_microphone wasDerivedFrom Carbon_microphone?oldid=605948240.
- Carbon_microphone depiction Carbon_Button_Microphone.JPG.
- Carbon_microphone isPrimaryTopicOf Carbon_microphone.
