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It contains two electrodes: the cathode, a hot
filament or a small metal tube that emits hot electrons through thermionic
emission, and the anode a plate element is the electron collector. In the diode, electrons emitted
by the cathode are attracted by the board only when it is positive with respect
'History of electronics' to the cathode. When the plate is negatively
charged, no current flows through the tube. By applying an alternating
potential to the plate, the current flows through the tube only during the
positive half cycle, thus acting as a rectifier.
The diodes are used in the
rectification of alternating current. The introduction of a third
electrode, called a grid interposed between the cathode and anode form a
triode, which has been for many years the base tube used for current
amplification. The triode was invented by
American engineer Lee De Forest in 1906. The grid is typically a fine
wire that surrounds the cathode and its function is to control the flow. When reaching a certain negative
potential, the grid prevents the flow of electrons between the cathode and
anode.
With lower negative potentials
the electron flow depends on the potential of the grid. The ability of triode
amplification is dependent on small changes in voltage between the grid and
cathode, which in turn cause large changes in the number of electrons reaching
the anode. With the passage of time have
developed more complex tubes with additional grids that provide greater
amplification and perform specific functions. The tetrodes have an additional
grid, next to the anode, forming an electrostatic barrier between the anode and
grid.
This prevents the feedback from
the same high-frequency applications. The pentode has three grids
between the cathode and anode, the third grid, the closest to the anode,
reflects the electrons emitted from the anode heated by electron impact when
the electron flow in the tube is high. The tubes with more grids,
called hexodos, heptodos and octodos, are used as mixers and frequency
converters in radio receivers.
Almost all vacuum tubes have
been replaced by transistors, which are cheaper, economical and reliable. The pipes still play an
important role in certain applications, such as power amplifiers for radio and
television transmitters or military equipment that must withstand the voltage
pulse induced by atmospheric nuclear explosions that destroy the transistors.
2.4-Transistors. The term transistor is the
contraction of transfer resistor, ie transfer resistance. The transistor is a
semiconductor electronic device that is used as an amplifier or electronic
switch. It is a key component in all
modern electronics, which is widely used as part of electronic switches, logic
gates, memories of computers and other devices. For analog circuits the
transistors are used as amplifiers, oscillators and wave generators.
Substitute three-electrode
vacuum tube or triode, the bipolar transistor was invented at Bell Labs in the
U.S. in December 1947 by John Bardeen, Walter Houser Brattain, and William
Bradford Shockley, who were awarded the Nobel Prize in Physics 1956.
General. Its inventors, John Bardeen,
William Bradford Shockley and Walter Brattain, so named for the property that
has to change the resistance to the passage of electric current between the
emitter and collector. The bipolar transistor has three
parts, as the triode. A carrier issuing (transmitter),
one who receives or collects (collector) and the third, which is sandwiched
between the first two, modulates the passage of such carriers (base).
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