Audio Amplifier Project_FINAL.docx - AUDIO AMPLIFIER PROJECT Audio Amplifier Project Students Name Rosendo Ramos Mathew Throne Instructors Name Jamieson

Audio Amplifier Project_FINAL.docx - AUDIO AMPLIFIER...

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AUDIO AMPLIFIER PROJECT Audio Amplifier Project Student’s Name: Rosendo Ramos, Mathew Throne Instructor’s Name: Jamieson Lewis Class: ET212 Electronics1 and Lab Date: 26 Oct 2015 1
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AUDIO AMPLIFIER PROJECT ABSTRACT A bipolar junction transistor is a semiconductor device used to amplify or switch Electronic signals. The device is a solid piece of semiconductor material with three connection terminal. The purpose of this laboratory assignment is to design, build, and study the operation of a multistage amplifier. The group accomplished this by using a differential amplifier being driven by a single npn BJT. There are multiple stages because a single stage may not be sufficient for most applications. Two big advantages of multistage over single stage are that it has a higher gain, and has flexibility for higher input and output impedances. 2
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AUDIO AMPLIFIER PROJECT TABLE OF CONTENTS ABSTRACT…………………………………………………………………….2 PROJECT DESCRIPTION……………………………………………………..4 INTRODUCTION……………………………………………………………...5 DESIGN CONSIDERATIONS………………………………………………...6 FINAL SCHEMATIC IN MULTISIM…………………………………………14 COMPONENTS/PARTS LIST…………………………………………………16 DATA SHEETS…………………………………………………………………17 SIMULATION RESULT………………………………………………………..30 CALCULATIONS………………………………………………………………33 CONCLUSION…………………………………………………………………39 REFERENCES…………………………………………………………………41 3
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AUDIO AMPLIFIER PROJECT Project Description This is a design project and the simulation software used to simulate the design is Multisim. The aim is to design an audio amplifier and simulate it on Multisim. The design parameters are: 1. The speaker load is 8 ohms. 2. Audio frequency is human range i.e. 20Hz to 20KHz. 3. Only BJTs are to be used and Op-Amps are not allowed. 4. The test bench results should comprise of Audio Amplifier Power Output of 5.6W with an Audio Amplifier Input of 150mVpeak and Audio Amplifier Power Output of 8.4 W with an Audio Amplifier Input of 200mVpeak. 4
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AUDIO AMPLIFIER PROJECT INTRODUCTION A bipolar junction transistor (BJT) is a three terminal electronic device that is constructed of semiconductor material and is used for switching or amplifying applications. There are two types of BJTs, which are PNP and NPN. Both are made of the same material but their physical characteristics are different. The different regions of the BJT are connected to its separate terminal E, B, and C. The NPN BJTs consist of a layer of P-doped semiconductors wedged between two N-doped layers. The PNP BJTs are the opposite of NPN being that the N-doped semiconductor is wedged between two N-doped semiconductors. There are four regions of operation for a BJT. These are: forward-active mode, reverse-active mode, saturation, and cutoff. The highest current gain is usually available in forward-active mode. Reverse-active mode is hardly used. Saturation operates as a closed electrical switch. Cutoff usually corresponds to an open electrical switch.
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