diode

3. A diode is an electric device that
permits the flow of current only in one
direction and restricts the flow in the
opposite direction. Diodes were the
first semiconductor electronic devices.
The discovery of crystals' rectifying
abilities was made by German
physicist Ferdinand Braun in 1874.

4. The first semiconductor diodes, called cat's
whisker diodes, developed around 1906, were made
of mineral crystals such as galena. Today most
diodes are made of silicon, but
other semiconductors such
as selenium or germanium are sometimes
used. A semiconductor diode, the most common
type today, is a crystalline piece
of semiconductor material with a p–n junction
connected to two electrical terminals. A vacuum
tube diode has two electrodes, a plate (anode) and
a heated.

6. Diodes have attributes that allow them to carry
out a number of electronic functions. Three vital
characteristics of diodes are as follows:
•Forward Voltage Drop- forward bias about seven
volts
•Reverse Voltage Drop- Weakened layer broadens,
generally the applied voltage
•Reverse breakdown voltage- reverse voltage drop
that’ll force flow of current and in maximum cases
demolish the diodes.

8. Light emitting diodes are replacing
conventional light bulbs because they require
less electricity to produce even more light and
it generates a very small or no amount of
heat. You can expect to see light emitting
diodes at work in large cities, where large
television screens display advertisements on
buildings (as shown above). LEDs are also
making a change in gasoline stations by
making gas pumps easier to read.

9. Photodiodes have become very useful when it
comes to safety in public places. Motion
sensors integrate photodiodes to detect
changes in light. Devices that associate with
motion sensors such as ceiling lights and
automatic doors help people see better at
night and let people through buildings without
effort from opening a door. These innovations
improve lives of those who are physically
challenged.

10. Finally, junction diodes, along with the other
different types of diodes, are abundant in
electronics. There is no need to explain how
computers have helped societies today. Early
electronic appliances, like digital alarm clocks
and radios, used diodes to show the time and
modulate frequencies in AM and FM.

12. A diode is an electric device that permits the
flow of current only in one direction and
restricts the flow in the opposite direction.
The most ordinary sort of diode in current
circuit design is the semi-conductor diode,
even though additional diode technologies
are present.
Zener diode works in reverse bias
situation when the voltage attains the
breakdown peak. An even voltage can
be attained by insertion of a resistor
across it to limit the flow of current. This
Zener diode is employed to give
reference voltage in power supplying
circuits.

14. A diode is an electric device that permits the flow of current only in one
direction and restricts the flow in the opposite direction. The most
ordinary sort of diode in current circuit design is the semi-conductor
diode, even though additional diode technologies are present.
Light Emitting Diode (LED): It is one of the most
popular type of diodes and when this diode permits
the transfer of electric current between the
electrodes, light is produced. In most of the diodes,
the light (infrared) cannot be seen as they are at
frequencies that do not permit visibility. When the
diode is switched on or forward biased, the
electrons recombine with the holes and release
energy in the form of light (electroluminescence).

16. A diode is an electric device that permits the flow of current only in one
direction and restricts the flow in the opposite direction. The most
ordinary sort of diode in current circuit design is the semi-conductor
diode, even though additional diode technologies are present.
Photodiode: Photodiodes are used to
detect light and feature wide, transparent
junctions. Generally, these diodes operate in
reverse bias, wherein even small amounts
of current flow, resulting from the light, can
be detected with ease. Photodiodes can
also be used to generate electricity, used as
solar cells and even in photometry.

18. A diode is an electric device that permits the flow of current only in one
direction and restricts the flow in the opposite direction. The most
ordinary sort of diode in current circuit design is the semi-conductor
diode, even though additional diode technologies are present.
Schottky Diodes: These diodes feature
lower forward voltage drop as compared
to the ordinary silicon PN junction diodes.
The voltage drop may be somewhere
between 0.15 and 0.4 volts at low
currents, as compared to the 0.6 volts for
a silicon diode.

20. A diode is an electric device that permits the flow of current only in one
direction and restricts the flow in the opposite direction. The most
ordinary sort of diode in current circuit design is the semi-conductor
diode, even though additional diode technologies are present.
Laser Diode: This type of diode is different
from the LED type, as it produces coherent
light. These diodes find their application in DVD
and CD drives, laser pointers, etc. Laser
diodes are more expensive than LEDs.
However, they are cheaper than other forms of
laser generators. Moreover, these laser diodes
have limited life..

21. A diode is an electric device that permits the flow of current only in one
direction and restricts the flow in the opposite direction. The most
ordinary sort of diode in current circuit design is the semi-conductor
diode, even though additional diode technologies are present.

22. A diode is an electric device that permits the flow of current only in one
direction and restricts the flow in the opposite direction. The most
ordinary sort of diode in current circuit design is the semi-conductor
diode, even though additional diode technologies are present.
Rectifier Diode: These diodes are used to
rectify alternating power inputs in power
supplies. They can rectify current levels that
range from an amp upwards. If low voltage
drops are required, then Schottky diodes can be
used, however, generally these diodes are PN
junction diodes.

23. A diode is an electric device that permits the flow of current only in one
direction and restricts the flow in the opposite direction. The most
ordinary sort of diode in current circuit design is the semi-conductor
diode, even though additional diode technologies are present.

24. A diode is an electric device that permits the flow of current only in one
direction and restricts the flow in the opposite direction. The most
ordinary sort of diode in current circuit design is the semi-conductor
diode, even though additional diode technologies are present.
Varicap Diode or Varactor Diode: This type of
diode feature a reverse bias placed upon it,
which varies the width of the depletion layer as
per the voltage placed across the diode. This
diode acts as a capacitor and capacitor plates
are formed by the extent of conduction regions
and the depletion region as the insulating
dielectric.

25. A diode is an electric device that permits the flow of current only in one
direction and restricts the flow in the opposite direction. The most
ordinary sort of diode in current circuit design is the semi-conductor
diode, even though additional diode technologies are present.

26. A diode is an electric device that permits the flow of current only in one
direction and restricts the flow in the opposite direction. The most
ordinary sort of diode in current circuit design is the semi-conductor
diode, even though additional diode technologies are present.
TUNNEL DIODE:
This diode is heavily doped in the forward
bias condition that has a negative
resistance at extremely low voltage and a
short circuit in the negative bias direction.
This diode is useful as a microwave
ampilifer and in oscillators.

27. A diode is an electric device that permits the flow of current only in one
direction and restricts the flow in the opposite direction. The most
ordinary sort of diode in current circuit design is the semi-conductor
diode, even though additional diode technologies are present.