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In general, all the electronic devices need DC power supply but it is impossible to generate DC power so, we need an alternative to get some DC power thus the usage of diodes comes into the picture to convert AC power to DC power. A diode is a tiny electronic component used in almost all the electronic circuits to enable the flow of current in only one direction (unidirectional device). We can say that the usage of semiconductor materials to build the electronic components was started with diodes. Before the invention of diode there were with vacuum tubes, where the applications of both these devices are similar but the size occupied by the vacuum tube will be much greater than the diodes. The construction of vacuum tubes is a bit complex and they are difficult to maintain when compared with the semiconductor diodes. Few applications of diodes are rectification, amplification, electronic switch, conversion of electrical energy into light energy and light energy into electrical energy.

Los diodos son componentes electrónicos que solo dejan pasar la electricidad en un solo sentido. Están construidos por dos cristales semiconductores de distinta polaridad, uno de tipo P y otro de tipo N, soldados entre sí.

Los 1N400x (o 1N4000) son una serie de diodos rectificadores para aplicaciones generales de 1 A, muy usados en electrónica debido a la gran versatilidad y al muy bajo precio. Forman parte de esta serie los modelos 1N4001, 1N4002, 1N4003, 1N4004, 1N4005, 1N4006 y 1N4007. La única diferencia entre ellos es la máxima tensión inversa que soportan. Por el resto, son similares e intercambiables entre sí.

This post explores the basics of how diodes work.
A diode is the most basic useful semiconductor device. It has two leads and acts as a one-way gate for electric current. Diodes have a multitude of uses, some of which we’ll touch on later.
We’ll start our tutorial on how diodes work with a very quick overview of basic semiconductor physics. This will serve as the basis for which all diodes work.

This post explores the basics of how diodes work.

A diode is the most basic useful semiconductor device. It has two leads and acts as a one-way gate for electric current. Diodes have a multitude of uses, some of which we’ll touch on later.

We’ll start our tutorial on how diodes work with a very quick overview of basic semiconductor physics. This will serve as the basis for which all diodes work.

El diodo BY251 es un diodo barato y se emplea principalmente en fuentes de alimentación para convertir una tensión alterna en una tensión continua. Se utiliza en cargadores de baterías, multiplicadores de tensión, limitador de voltaje. Lo podemos usar siempre que el 1N4007 se nos quede corto, ya que el BY251 puede rectificar sin problemas hasta 3A hay que vigilar que no se puede usar en circuitos que rectifiquen directamente la tensión de red, ya que solo aguanta hasta 200V.