Carbon film resistor
Electrical resistors are utilized in the vast majority of electrical and electronic circuits. There are various types of resistors available and they are the carbon composition type, the metal oxide film type, the metal glass film type, and the deposited carbon film type. Although other types exist, the use of carbon containing resistors is widespread because of various factors including relatively low cost and good operational characteristics. Carbon resistors are produced by a wide variety of processes combining carbon with a binder or screening carbon and a binder onto a substrate followed by a bake cycle. The deposited carbon film type is made by placing a ceramic rod in a retort having an atmosphere of hydrocarbon gas. By cracking the gas the rod is coated with a film of carbon. With both this film and the metal oxide film, the desired resistance is obtained by spiraling the coating deposited on the surface of the ceramic rod. Carbon film resistors have been generally extensively utilized as variable resistors for use in radio receivers, audio amplifiers and TV receiving sets. Carbon film type variable resistors are generally divided into rotary types and sliding types. In the case of sliding types, since the knobs are moved back and forth or left and right, the order of adjustment can be known at a glance. Since a plurality of them can be installed in a small area, their use in audio mixers, electronic pianos, etc. is expanding. However, with increasing miniaturization of electric devices, an increasing number of chip resistors are used in recent years. In addition, along with the growing demand of mounting electric devices by a surface mounting, carbon-film resistors with lead wires are gradually replaced with chip resistors.
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