Radio waves received by an antenna flow through circuits as alternating current. Receivers had more technical difficulties than transmitters. It was the wireless communication in which radio waves were used as a sort of smoke signal.
#FERRITE CORE INDUCTOR ANTENNA CODE#
In primitive wireless communication, dot-and-dash Morse code was sent (information was converted to short signals (dots) and long signals (dashes)) using radio waves generated during spark discharge. This resulted in just a discovery of a new phenomenon, but such a principle started to apply to crystal detectors for receiving radio waves when wireless communication started at the beginning of the 20th century. When measuring the electrical resistance of various minerals such as chalcopyrite and galena, he found that the resistance values varied depending on how positive and negative electrodes were applied. German physicist Karl Ferdinand Braun, whose name was reflected in the cathode-ray tubes of TVs, made an important discovery circa 1873 that was a precursor to the invention of point-contact diodes and transistors. TDK’s ferrite cores that were used in mu (μ) tuners for radios in pre-war days The dynamism of nature has produced natural ferrite magnets under the soil, and human technologies created artificial ferrite magnets in the 20th century. Lodestones (variation of magnetite), which have stimulated people’s curiosity since before Christ, are in fact natural ferrite magnets. Fe2O3, or Fe3O4, showing the composition of magnetite (Fe3O4).If M represents iron (Fe2+), the formula is FeO M is replaced by various metal elements such as cobalt, copper, manganese, and zinc, and this means that a wide variety of ferrites can be obtained. Fe2O3 (M is not a specific element symbol, but an abbreviation for various metal elements), which is a compound of an oxide of a divalent metal ion (M2+) and an oxide of a trivalent iron ion (Fe3+).TDK took over the patent for it, and industrialized, and sold it under the product name “oxide core” (TDK was founded in 1935, and its name then was Tokyo Kagaku Kogyo K.K.).įerrite is a substance represented by the chemical formula MFe2O4 or MO Soon afterward, they also invented a soft magnetic ferrite material (soft ferrite). This is how the OP (oxide powder) magnet, the world’s first ferrite magnet, was created. During a research into ferrite, which was troublesome reducing the zinc yield, it was accidentally found that there was a strongly magnetic ferrite. In this process, iron oxides contained in the ores are combined with zinc into ferrite. In order to obtain zinc, zinc ores are sintered to form zinc oxides, which are dissolved with sulfuric acid into a solution, and this is decomposed by an electric current. Takeshi Takei at Tokyo Institute of Technology, is also an electronic material created from research into a method for extracting zinc from ores such as sphalerite. It was first discovered by the Curie brothers in France (older brother: Jacques younger brother: Pierre) from minerals such as tourmaline and crystal.įerrite, which was invented in 1930 by Dr. Piezoelectric phenomenon, in which the application of pressure generates voltage, is used for electronic buzzers, ultrasonic transducers, pressure sensors, etc. Mineralogy greatly contributed to electromagnetism in the 19th century and also to the birth of electronics in the 20th century. In the past, attraction properties were magnetic things that attracted everyone's attention. Also, tourmaline (electric stone), which attracts dust or ash when heated, was also called “Ceylonese Magnet” named after its locality. The word magnetic, the adjective form of the word magnet, means not only “of or relating to a magnet or magnetism” but also “attractive or alluring.” It has since been known a long time ago that rubbed amber attracts dust or ash (static electricity) or that a lodestone (variation of magnetite) attracts iron. Lodestones are ferrite magnets produced by the Earth