Matt Summer
Hernan Pena
Gustavo Toledo
Josh Summer

Outline
Thyristors/Triacs Matt
Diodes Hernan
Zener Diodes/Thermistors Gustavo
Photoresistors/Optoisolators Josh

Thyristors

Four layer devices
Class of semiconductor components
Wide range of devices, SCR (silicon controlled rectifier), SCS (silicon controlled switch), Diacs, Triacs, and Shockley diodes
Used in high power switching applications
i.e. hundreds of amps / thousand ....etc

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ABSTRACT
The Integrated Gate Commutated Thyristor (IGCT) combines the advantages of the hard driven GTO thyristor, including its dramatically improved turn- off performance, with technological breakthroughs at the device, gate-drive and application levels. Homogenous switching area of the IGCT up to the dynamic avalanche limits. Snubber circuits are no longer needed. Improved loss characteristics allow high frequency applications extending into the kHz range. A new ....etc

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Construction and working of impatt diode?? ....etc

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Presented By:Name:- SABYASACHI SABAT
Stream:- ETE
IMPATT Diode

Introduction
When the pn junction diode is reverse-biased, then current does not flow.
However when the reverse voltage exceeds a certain value, the junction breaks down and current flows with only slight increase of voltage. This breakdown is caused by avalanche multiplication of electrons and holes in the space charge region of the junction.
The pn junct ....etc

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send me details of above topic ....etc

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INTRODUCTION
When we talk about optical communication, most people think about optical-fiber. But optical communication is also possible without optical-fiber. We know that light travels through air for a lot less money. This makes possible the optical communication without optical-fiber. Optical communication without fiber is known as Free Space Optics. It is used due to economic advantages. Since the introduction of internet the backbone traffic is increasing at the rate greater than 100%, hence the owner of the backbone ....etc

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Abstract:
An avalanche is a rapid flow of snow down a slope, from either natural triggers or human activity. At present snow gauge and direct measurements are the most commonly used techniques adopted for measuring snow depth. This paper deals with total design and implementation of microcontroller based snow depth sensor using ultrasonic pulses.

INTRODUCTION
Precipitation is mainly in the form of rain and snow. In the universe 5% of annual precipitation is in the form of snow. Snow avalanches occur in higher mountains ....etc

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advantages and disadvantages of diac ....etc

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CMOS based photodetection systems for biomedical application
Dhanya Balan
s7 AEI
Roll.no.20
College Of Engineering, Trivandrum
2007-11 batch


Overview
Introduction.
Designs,results and discussions.
Cmos imagers.
Conclusions.
References.

Introduction
Introduction.
Designs,results and discussions.
Cmos imagers.
Conclusions.
References.

CMOS based systems
Cheap
Low power
High integration
Widespread applications

Flourescent imaging
Analysis of fl ....etc

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What are Natural Disasters?
Volcanic eruption
Earthquake
Cyclone or Hurricane
Avalanche
Flood
Drought
Forest fire or Bushfire

Volcanoes
A volcanic eruption is the spurting out of gases and hot lava from an opening in the Earth’s crust.

Pressure from deep inside the Earth forces ash, gas and molten rock to the surface.

Earthquake
An earthquake is a violent shaking of the ground. Sometimes it is so strong that the ground splits apart.

When parts of the earth ....etc

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BRIEF DESCRIPTION OF COMPONENTS:
1) Transformer:-
A transformer is a static device which consists of two or more stationary circuits interlinked by a common magnetic circuit for the purpose of transferring electrical energy between them.
• E.M.F equation of a transformer:
e=4.44Baft
B=maximum flux density in the magnetic circuit.
a=area of cross-section of the core.
f and t are frequency and no. of turns respectively.
• Step up and step down transformer:
A step up transformer is one whose secondary voltag ....etc

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