STAR-DELTA Conversion

The Y-Δ transform, can also be spelt as wye-delta.This star-delta transformation theory was proposed by Arthur edwin kennelly in 1899.Star-delta transformations allows to convert impedances that are connected together from one type of connection to another type.

   We can now solve series, parallel or bridge type resistive networks using Kirchoff´s Circuit Laws, mesh analysis or nodal analysis techniques but in a balanced three-phase circuit. we now can reduce by mathematical solutions.

         The networks star and delta are obtained from resolving the T and PI resistor networks respectively.If we consider some different examples of T and PI they are shown aa below.

PI to DELTA

T to STAR

Star-delta & Delta-star transformations are used in DC Circuit Theory for analysis of Complex Circuits.Star-Delta Transformer Connection is now commonly used for power supply transformers.

8085 Micro Processor in real world

1. The Intel 8085 ("eighty-eighty-five") is an eight-bit microprocessor introduced by intel in 1977. It was the backward binary compatible one with the famous Intel 8080 ,only difference is addition of a few minor instructions, but required less supporting hardware, thus allowing simpler and less expensive microcomputer systems to be built.

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   8085 MP architecture

   A device that uses a microprocessor is normally capable of many functions, such as word processing, calculation, and communication via Internet or telephone. However,  to work properly, the microprocessor itself has to communicate with other parts of the device. For example, a microprocessor would need to communicate with the video display to control the output data that a program may produce. Therefore, a microprocessor would act as device's "brain" in that it transmits, receives and interprets the data needed to operate a device.

                                            

8085 MP pin diagram

1. Microprocessors can be found in calculators, gaming consoles, wristwatches, consumer electronics and even automobiles.Real time image of a 8085MP is below.

                                                   

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DIODE -Its different types

Universal diode form

A diode is a semi-conductor device,with two terminals allowing flow of current in only one direction.The discovery of crystals rectifying abilities was made by German physicist Ferdinand Braun in 1874. The first semiconductor diodes, called cat's whisker diode, developed around 1906, were made of mineral crystals such as Galena.In these days,most of the diodes are made of si, but other semiconductors such as selenim or germanium are also sometimes used.

                            

                    

voltage vs current characteristics

The characteristics of a diode define the transfer of charge carriers as of called depletion layer formation during semiconductor state and variations takes place.If an external voltage is placed across the diode with the same polarity as the built-in potential, the depletion zone continues to act as an insulator, preventing any significant electric current flow . This is the Reverse Bias phenomenon.

                                        

Different Types Of Diodes

As well, there are many different types of diodes we use in our dialy lives.The above figure shows the diodes which we use generally.If we consider about the symbols i.e symbols reflecting different diodes
can be seen in below figure.

These symbols are mainly used while representing the electronic circuits in our studies.These different diodes make their use in respective functions as per their working limits.