Preamplifier And Loudspeaker & Muting design for a studio series stereo amplifying system
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Date
2012
Authors
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Publisher
University of Management and Technology
Abstract
In our final year project we successfully amplified any random signal with less power dissipation and higher efficiency using Class D amplifying System. Firstly we implement using Class A and calculated power dissipation that is too large.So, we did research on different Classes of amplifying system and selected Class D because this is highly efficient amplifying Class. For Analog Class D amplifying System, we implemented three blocks.Firstly,modulation blocks which takes the random audio signal and compares it with triangular carrier signal and superimpose into the carrier and generate PWM signal. Secondly, Switching Output block (Inverter, Gate Driver, Switching MOSFET’S) takes the output of PWM and amplifies it up to the required level. Gate driver is necessary to operate switching MOSFET’S according to the requirement, the proposed gate driver features consumes much less energy as well as minimized conduction and switching (delay time, rise time, reverse recovery time, fall time and decay time)losses.Thirldy,Low Pass Filter block is to recover back our original random signal. For Digital Class D amplifying system, we implemented three blocks. Firstly, UPWM (Uniform Pulse Width Modulation) block which takes the digital signal and turn into in stair-case signal which further is given to the Switching output block. We implemented UPWM using microcontroller PIC 16F877A.
Description
Supervised by: Muhammad Rizwan
Keywords
Electrical Engineering, BS-Thesis, UPWM, Class D amplifying