elx_transistor-maloles mikee

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GOOD DAY!!! Our topic for today is about…

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TRANSISTOR

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TOPIC OUTLINE: I. What is transistor? a. Three terminals of transistor - emitter - base - collector II. Advantages and limitations of transistor Comparison with vacuum tubes III. Types of transistor according to structure according to polarity IV. Transistor Biasing V. Transistor Circuit Configuration VI . Transistor Tester Project

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What is transistor?

TRANSISTOR: 

TRANSISTOR -is a semiconductor device used to amplify and switch electronic signals. -is the fundamental building block of modern electronic devices , and is ubiquitous in modern electronic systems -discovered or born in Bell Laboratories (1984) -it could perform a variety of applications such as switch, amplifiers, oscillator , etc

MODERN ELECTRONIC DEVICES:: 

MODERN ELECTRONIC DEVICES: CALCULATOR COMPUTER RADIO

What are the THREE TERMINALS of TRANSISTOR?: 

What are the THREE TERMINALS of TRANSISTOR? Emitter (E) Base (B) Collector (C)

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ADVANTAGES OF TRANSISTOR

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Small size and minimal weight, allowing the development of miniature electronic devices Lower possible operating voltages, making transistors suitable for small, battery-powered applications No warm-up period for cathode heaters required after power application Extremely long life . Some transistors have been in service for more than 50 years It is a rugged component It is cheaper than vacuum tubes

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LIMITATIONS OF TRANSISTOR

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Silicon transistors typically do not operate at voltages higher than about 1000 volts. High-power, high frequency operation, such as that used in over-the-air television broadcasting, is better achieved in vacuum tubes due to improved electron mobility in a vacuum Inability to operate satisfactorily in high surrounding temperatures

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TYPES OF TRANSISTOR

According to structure : 

According to structure BJT JFET IGFET (MOSFET) IGBT Other types

According to polarity : 

According to polarity NPN (Negative Positive Negative ) PNP (Positive Negative Positive)

NEGATIVE POSITIVE NEGATIVE: 

NEGATIVE POSITIVE NEGATIVE

POSITIVE NEGATIVE POSITIVE: 

POSITIVE NEGATIVE POSITIVE

NPN and PNP TRANSISTORS: 

NPN and PNP TRANSISTORS

TRANSISTOR BIASING: 

TRANSISTOR BIASING

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It is of particular importance to note that the EMITTER-BASE junction of each transistor is connected in a FORWARD BIAS manner. Therefore, the emitter-base junction is a low resistance or, more accurately, a low impedance circuit , and current could flow rather freely in this circuit. The COLLECTOR-BASE junction, however, is connected in a REVERSE BIAS manner. It is a high impedance circuit. Currents flowing IN or OUT of the emitter are termed I E Currents in the BASE circuit are I B . Collector currents are I C .

TRANSISTOR CIRCUIT CONFIGURATION: 

TRANSISTOR CIRCUIT CONFIGURATION

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a. Common- Emitter Circuit - is used for an amplifier circuit because it has the highest current and voltage gain b . Common- Base Circuit - is seldom used in an amplifier circuit because of its very low current and voltage gain - this circuit is commonly used in FM tuners for impedance matching c . Common Collector or Emitter Follower - is used in power amplifiers to match the lower- impedance voice coil of loud speaker

Common –Emitter Circuit: 

Common –Emitter Circuit

Common- Base Circuit: 

Common- Base Circuit

Common Collector or Emitter Follower: 

Common Collector or Emitter Follower

TRANSISTOR TESTER PROJECT: 

TRANSISTOR TESTER PROJECT

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A transistor tester is an excellent project that almost every experimenter needs . This inexpensive tester will test almost any type of conventional transistor . A “GOOD” transistor will give an audio tone in the speaker . If the transistor is “BAD”, no tone will be heard.

REFERENCES:: 

REFERENCES: Transistor Electronics (pp.194-202;207) Understanding Solid State Electronics (pp. 120-156) en wikipedia.org/wiki/ file.transistor Electronics for Beginners (pp. 11-12) Pinoy Entrepreneur- Industrial Arts and Technology (pp.284-287)

THANK YOU and GOD BLESS!!! : 

THANK YOU and GOD BLESS!!! Prepared by: Fatima Micah P. Maloles (mikee01) “ The fantastic advances in the field of electronic communication constitute a greater danger to the privacy of the individual ” -Earl Warren