Diode

Diode
A diode is an electronic component that allows passing electricity in one direction only, this has two terminals through which the electricity, a diode is a semiconductor and is a veryimportant in the electronics industries.
Called anode to the positive electrode of an electrolytic cell which is directed toward the negative ions it is called the cathode to the negative electrode of anelectrolytic cell into which the positive ions are directed.
Some types of diode are:

* Rectifier diodes:



Rectifier diodes are known in principle;they facilitate the pass of electricity in one only direction if we circulate alternating current through a rectifying diode will in this single half semi cycles, those that directly polarized diode,so that the output thereof to obtain a pulsed signal but continuous. It is known that signal or DC voltage that does not vary its polarity.

* LED


Light Emitting Diode, LED, that emitslight to be biased, inconsistent call a narrow range, are classified within the semiconductor and are formed by a pn junction. There are red, green, yellow and infrared, to make a LED work requiresonly about 20 mA.

* Varactor

Variable capacitance diode, also called varactor. This diode is a capacity at the ends of the joined PN, which is useful when seeking to use that capacity gain ofthe circuit in which the diode should work.
When one varicap polarize directly, we observe that in addition to constituting areas which seek capacity, they appear in parallel with a resistor of verylow ohmic value, forming with it a capacitor of high losses. In contrast if in reverse polarize the aforementioned parallel resistance is a relatively high value, resulting in that the diode behaves asa low loss capacitor.

* Photo Diode



A photo diode reverse does an LED, light needs to operate is similar to a photocell or photoresistor, which operates in...