BLUETOOTH CONTROLLED HIGH POWER AUDIO AMPLIFIER (III-II minor project proposal defense)
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This document presents a Bluetooth controlled high power audio amplifier project. The project aims to build a cost effective audio amplifier with 80-100 watts of power that can be controlled digitally and wirelessly via Bluetooth. It will use an 8051 microcontroller to control tone, effects and volume digitally. A remote interface and PC application will allow wireless Bluetooth control of the amplifier. The document outlines the objectives, components, methodology, applications, cost estimation and time schedule of the project.
BLUETOOTH CONTROLLED HIGH POWER AUDIO AMPLIFIER (III-II minor project proposal defense)
- 1. BLUETOOTH CONTROLLED HIGH POWER AUDIO AMPLIFIER Presented By: Bijay Raj Paudel (Roll No: 067/BEX/105) Sagar Mali (Roll No: 067/BEX/133) Sujan Shrestha (Roll No: 067/BEX/140)
- 2. Decent quality High Power Audio Amplifier 8051 Microcontroller based Digital control over tone, effects & volume Wireless Bluetooth Interface Control via Computer Software and/or Keypad INTRODUCTION
- 3. To construct cost effective audio amplifier. To implement 8051 μc along with it’s interfacing. To control the system via wireless Bluetooth module. To program μc & develop GUI based PC application. To improve our programming & practical skills. OBJECTIVES
- 4. PROBLEM STATEMENTS & SOLUTIONS Present Amplifier Analog Control Wired Less Portable No Display Our Amplifier Digital Control Wireless More Portable LCD Display
- 5. METHODOLOGY System is divided into two major parts : Main Board Remote and PC Interface
- 7. Remote & PC Interface
- 8. Pre Amplifier Optimizes signal Reduces noise & disturbances Includes multi Op-Amp stages and transistorized stages for low level signal amplification and filter Brief Description of Main components
- 9. Power Amplifier 100 watt max class AB audio amplifier Adjustable output transistor biasing to avoid crossover distortion Overheat protection and short circuit output protection Brief Description of Main components
- 10. Digital Potentiometers • A digital potentiometer (informally a digipot) is a digitally controlled electronic component that mimics the analog functions of a potentiometer. • It is used for trimming and scaling analog signals by microcontrollers. Brief Description of Main components
- 11. 8051 Microcontroller (AT89s52, AT89s2051) 256x 8-Bit Internal RAM In-System Programmable (ISP) Flash Program Memory – Serial Interface for Program Downloading 32 Programmable I/O Lines in s52 and 16 in s2051 Fully Static Operation: 0 Hz to 24 MHz Programmable Serial UART Channel Low Power Idle and Power Down Modes Brief Description of Main components
- 12. EEPROM Holds the data even when the power is removed Used to save previous digital settings Can also be programmed to hold custom greeting messages Brief Description of Main components
- 13. Bluetooth Module Heart of the wireless data communication Two TX and RX modules to be used Transfers data to & from μc using UART protocol Brief Description of Main components
- 14. MAX 232 IC (TTL to RS232 Convertor) • Microcontroller logic levels 0-0.5 V and 4.5-5 V • Max 232 circuit converts signal from RS-232 to 5 V TTL signal level • IC 7805 to provide power supply to MAX 232 Brief Description of Main components
- 15. Brief Description of Main components RS232 to USB Convertor Converts RS232 to USB signal Makes the system more portable
- 16. Brief Description of Main components LCD Graphical LCD is planned to be used if available instead of normal alphanumeric LCD. Ability to display custom sized fonts, images and audio spectrum visualization instead of just characters.
- 17. PC and GUI Control Application Runs on OS of PC Based on C# .NET To change amplifier setting Brief Description of Main components
- 18. Auditorium Hall Seminar Presentation Lecture Theatrical and Concert sound reinforcement Home Theater System Car Audio System Guitar Amplification APPLICATIONS
- 19. S.N. Item Unit Cost(Rs.) Quantity Total (Rs.) 1. Power Transistor 60 6 360 2. Microcontroller 150 4 600 3. EEPROM 200 1 200 4. Speaker (100 Watt) 1000 2 2,000 5. Bluetooth Module 1500 1 1,500 6. Digital Potentiometer 200 8 1,600 7. Audio Op-Amp 100 5 500 8. PCB Board 800 1 800 9. RS232 to USB convertor 1000 1 1,000 10. Others ~ ~ ~2,500 Grand Total ~11,000 COST ESTIMATION
- 20. TIME ESTIMATION S.N. Title Estimated Time 1. Project Identification 1 week 2. System Planning 1 week 3. System Analysis 1 week 4. System Design 2 weeks 5. System Implementation 3 weeks 6. Troubleshooting 1 week Total 9 weeks
- 21. CONCLUSION Thus, our final product is going to be HIGH POWER AUDIO AMPLIFIER. We expect to build BLUETOOTH INTERFACE between system & digital control. Finally, it will have it’s own GUI BASED CONTROL APPLICATION which can be operated through Bluetooth enabled devices.
- 22. BOOKS: A.S. Sedra and K.C. Smith, “Microelectronics Circuits Theory and Application”, 5th edition, Oxford University Press Muhammad Ali Mazidi, “8051 Microcontroller and Embedded Systems”, Prentice Hall, 2006 Douglas Self, “Audio Power Amplifier. Design Handbook”, 3rdedition. WEBSITES: http://hackaday.com/2011/06/27/stereo-amplifier-with-digital-volume- control/ http://www.diyaudio.com/forums/solid-state/ http://en.wikipedia.org/wiki/Bluetooth http://www.bluetooth.com/ REFERENCES
- 23. THANK YOU !