Diode is bersaluran two active components (thermionic diodes may have a third channel for heating).
Diodes have two active electrodes in which electrical signals can flow, and most of the diodes are used because of its characteristics in one direction. Varikap diode (variable capacitor / variable capacitor) is used as voltage controlled capacitors.
Kesearahan properties owned most types of diode characteristics are often referred to rectify. The most common function of the diode is to allow an electric current flows in one direction (called the forward bias condition) and to restrain the flow from the other direction (called the backward bias condition). Therefore, the diode can be regarded as an electronic version of the valve in the transmission fluid.
History of the diode
Although the crystal diode (semiconductor) was popularized before the thermionic diode, thermionic diode and crystal diode developed separately at the same time. The working principle of thermionic diodes was discovered by Frederick Guthrie in 1873 while working principle of crystal diodes was discovered in 1874 by German researchers, Karl Ferdinand Braun.
At the time of the invention, a device like this is known as a rectifier (rectifier). In 1919, William Henry Eccles coined the term diode from the mean of two, and ode (from ὅδος) means "path".
The working principle diode
Thermionic diode working principle rediscovered by Thomas Edison on February 13, 1880 and he was given a patent in 1883 (U.S. Patent 307,031), but not developed further. Braun patented the crystal rectifier in 1899. Braun's discovery was developed further by Jagdish Chandra Bose into a useful device for radio detector.