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Crystal detector
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A crystal detector is an electronic component used in some early 20th century radio receivers. It consists of a piece of crystalline mineral that rectifies an alternating current radio signal. It was
Galena cat whisker detector used in early crystal radio
Galena cat whisker detector used in early crystal radio
Precision crystal detector with iron pyrite crystal, used in commercial wireless stations, 1914. The crystal is inside the metal capsule under the ver
Precision crystal detector with iron pyrite crystal, used in commercial wireless stations, 1914. The crystal is inside the metal capsule under the vertical needle (right). The leaf springs and thumbscrew allow fine adjustment of the pressure of the needle on the crystal.
Pictorial diagram from 1922 showing the circuit of a cat whisker crystal radio. This common circuit did not use a tuning capacitor, but used the capac
Pictorial diagram from 1922 showing the circuit of a cat whisker crystal radio. This common circuit did not use a tuning capacitor, but used the capacitance of the antenna to form the tuned circuit with the coil.
Galena cat whisker detector from a 1920s crystal radio
Galena cat whisker detector from a 1920s crystal radio
Semiconductor
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A semiconductor is a material with electrical conductivity between that of a conductor and an insulator. Its conductivity can be modified by adding impurities to its crystal structure. When two region
Crystal detector
…pushes the earphone diaphragm, causing it to vibrate and produce sound. The crystal detector consisted of an electrical contact between the surface of a semiconducting crystalline mineral and either a metal or another crystal. Since at the time they were developed no one knew how they worked, crystal detectors evolved…
Silicon crystals are the most common semiconducting materials used in microelectronics and photovoltaics.
Silicon crystals are the most common semiconducting materials used in microelectronics and photovoltaics.
Karl Ferdinand Braun developed the crystal detector, the first semiconductor device, in 1874.
Karl Ferdinand Braun developed the crystal detector, the first semiconductor device, in 1874.
John Bardeen, William Shockley and Walter Brattain developed the bipolar point-contact transistor in 1947.
John Bardeen, William Shockley and Walter Brattain developed the bipolar point-contact transistor in 1947.
4 fach NAND C10
4 fach NAND C10