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Electronics Tutorial

Electronics for beginners

 
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Electronics Tutorial for Beginners

ABC of Electronics Offering free comprehensive basic electronics tutorial. In this Electronics Tutorial we have explained the basic electronic concepts. Here you can find 8051 Tutorials & 555 Timer Tutorials which are commonly used in electronics. Every effort is made to keep the website up and running smoothly

 

Junction Diode

junctiondiode

It conducts an electric current in one direction and blocks it in the reverse direction. This property comes from the electrical characteristics of a junction, called a p-n junction made up within a semiconductor crystal. The most commonly used semiconductor materials are silicon or germanium. The p-n junction is also the major part of other electronic devices, of which the most well-known is the junction transistor.

PN Junction Basics

P=Holes or defiency of electrons

N=Available Electrons

Near Junction electrons diffuse with holes making a depletion region. N Type doping is done by arsenic, phosphorus and P type, Boron.

Forward Biasing : Shrinking of Depletion Layer, & A large diffusion current is able to flow.

Reverse Biasing: Depletion Layer Grows and very small reverse current flows.

The junction diode is useful in a wide range of applications such as

  •  Rectification of AC signals

  •  Detection of radio signals

  • Conversion of solar power to electricity

  • Used in electronics circuits like switch, as a voltage reference

    The rejoining of free electrons makes a narrow region on either side of the junction that contains no mobile charge. This narrow region which has been depleted of mobile charge is called the
    depletion layer. This layer extends into both the p-type and n-type regions. There is then a separation of charges: negative fixed charges on the p-type side of the depletion layer and positive fixed charges on the n-type side.

Junction Breakdown

It occurs when the reverse voltage reaches a critical value.

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