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Electronic system of language education laboratory
Skoumal, Martin ; Bradáč, Zdeněk (referee) ; Zezulka, František (advisor)
This work deals with the creation of electronically controlled audio system for the language classroom. Possible solutions compares analog and digital form. Furthermore, describes the final system that was designed. The resulting system is implemented by analog amplifiers and analog crosspoint matrix. Hardware control is realized by microcontroller and that is controlled from the computer.
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Four-electrode impedance plethysmograph
Port, Martin ; Kolář, Radim (referee) ; Chmelař, Milan (advisor)
This master’s thesis is an introduction to the measurement of changes in tissue impedance of blood flow by impedance plethysmography. Other chapters deal with the kinds of plethysmographs and their principles. The aim is to draft four-electrode impedance plethysmograph to measure changes in tissue impedance depending on blood flow. First, describe the individual blocks of the medical instrument. The practical part of the master’s thesis involves circuit design four-electrode plethysmograph. Given that a very important role in its function plays a constant current source operating at a frequency of 60kHz, this subset was implemented and verified its correct function. To draw component schemes used program EAGLE version 5.10.0.
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Application possibilities of LNVGA programmable amplifier
Sobotka, Josef ; Hanák, Pavel (referee) ; Jeřábek, Jan (advisor)
This thesis deals with the theoretical description of the qualitative characteristics and parameters of some modern active elements, also discusses the theory of signal flow graphs at the level applicable for the following frequency filter design methods. The thesis is also generally discussed the issue with the circuit simulator PSpice modeling theory and voltage amplifiers on the basic 6-levels. The practical part of the work is divided into two parts. The first practical part is dedicated to design four levels of simulation model of components LNVGA element. The second practical part contains detailed theoretical proposals for three circuit structures implementing the frequency filters 2nd order (based on the basic structure of the OTA-C) using signal flow graphs with configuration options of Q and fm based on the parameters of active elements in the peripheral structure and their verification with prepared LNVGA model layers.
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Realization of the high-end audio amplifier LEACH
Korvas, Miroslav ; Dostál, Tomáš (referee) ; Slezák, Josef (advisor)
The theme of my bachelor’s thesis is a realization of the high-end audio amplifier and it’s modification for the lowest distortion. Because it was not specified, I have decided to for realization of amplifier 100 W. I use modification of LEACH amp circuit for using ThermalTrak [5] transistors. My bachelor’s thesis describes problems of distortion and particular description of separate blocks of LEACH amplifier and their function. The practical part of the bachelor’s thesis contains heat sink design, measurements and simulations of the amplifier and their confrontation to theory. Technical documentation for realization of the ThermalTrak amplifier contains printed circuit board.
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Design of magnetoplanar headphones with amplifier
Chyťa, Filip ; Búran, Martin (referee) ; Skácel, Josef (advisor)
This work deals with comparison of individual types of electroacoustic transducers, their properties and practical use. Furthermore, design and manufacture of a magnetoplanar transducer, its integration into headphones and the production of headphone amplifier. The first chapter summarizes all types of electroacoustic transducers, their properties, advantages, disadvantages, and their use in practice. The second chapter deals with the classes of amplifiers. The third chapter deals with the choice of design of a magnetoplanar transducer, headphones, and selected type of headphone amplifier. The last chapter describes the production process of individual parts of the headphones, transducer and amplifier, including the final measurement.
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Audio amplifier with digital input and power and headphone output stage
Abrman, Milan ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
The aim of this thesis is design and construction of amplifier for high quality home listening experience. Device is able to process both analogue signal and high sampling frequency digital input with high audio bit depth. Scope of the thesis covers the design of all the functional units: input signal circuit, S/PDIF receiver, D/A converter, high performance class D amplifier and precise headphone amplifier for dynamic sound presentation. Thesis also cover design of all control circuits containing rotary encoder with button input, microcontroller unit, digital potentiometer and segment display.
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HiFi DA Converter with Integrated Headphone Amplifier
Doležal, Pavel ; Jaroš, Jiří (referee) ; Šimek, Václav (advisor)
This thesis is dealing with a design and fabrication of D/A coverter and headphone amplifier for stereo reproduction in Hi-Fi class. In opening chapter, overall problematics of digital audio signal distribution is discussed. Following chapters are dedicated to converter design, communication protocols, component selection, converter production, circuitry design and firmware programming. The final chapter is dealing with expansion options such as HDMI inputs and surround sound.
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Design and construction of audio power amplifier
Růžička, Jaroslav ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
This bachelor’s thesis is concerned with amplifier classes, integration end-level, protective circuits and concrete concept of class AB power amplifier, including concept of preamplifier and power amplifier. Features of designed circuits were simulated in PSpice software. These individual concepts of modules are connected with DPS. This thesis contains results of measurement and photos of amplifier.
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Design and Realization of Loudspeker System for Wavefield Synthesis
Naňák, Pavel ; Koton, Jaroslav (referee) ; Schimmel, Jiří (advisor)
The thesis deal with the design and construction of single cluster of apparatus which can serve as a signal source for wavefield synthesis. Apparatus can be controlled remotely by Ethernet interface. Thesis contains theoretical analyses of speaker system, class D amplifier, digital to analog conversion, digital format of acoustic data ADAT and Ethernet interface. Conceptual design of cluster and description of constructed module is concerned.
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Amplifier with Speaker Protection
Přibyl, Libor ; Schimmel, Jiří (referee) ; Kubánek, David (advisor)
The present work deals with the issue of speaker damage due to large displacement of the membrane at low frequencies. The main focus is the design and construction of the circuit to protect the speakers from this type of damage and the subsequent measurement of its parameters. The thesis includes theoretical predictions for the optimal design and implementation of the circuit. The work includes complete construction of equipment, including power supply and auxiliary circuits.
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