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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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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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Broadband Amplifier for the Counter
Kudlička, Miroslav ; Frýza, Tomáš (referee) ; Říčný, Václav (advisor)
This work deals with possibilities design of broadband amplifier fit for the counter LCK-1. There are described three methods for possibilities solvings. The method by discretes of parts with stagger-tuned circuits, the method by operational amplifier THS3201 and the method by monolitic amplifier ERA-3. The Method by operational amplifier THS3201 is chosen like the best method, because this operational amplifier can amplify very small signals. There is designed of amplifier THS3201 in the simulation software PSpice and this results are take into account for realization broadband amplifier.
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Ultrasound desintegrator of concrements
Straka, Petr ; Čížek, Martin (referee) ; Rozman, Jiří (advisor)
This thesis is focused on the methodes of crushing kidney’s concrements with continual wave for the frequency 27 kHz and the intensity of ultrasound 10 W/cm2. The main aim is design of the ultrasound head with layer converter and design circuitry. First part of this work describes physical principle of ultrasound, ultrasound waves and methods by which could be remove kidney’s concretions. Practical part of this work is focused on compreshive design of ultrasound crushing system. In the introdiction is analyzed the proposal of applicator and the next step decscribing proposal excitation generator. The work contains results of simulation which was done on proposal curcuit, drawings of scheme, list of components and drawing of PCB.
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Development of wireless rumen probe
Šídlová, Ludmila ; Matěj, Zdeněk (referee) ; Fedra, Zbyněk (advisor)
The aim was to study the possibilities of wireless transmission from the stomach of ruminants and to design and implement wireless ruminal probe. The first part deals with the internal wireless probe. The next section describes and evaluates available ruminal probe. There is given its own equipment design in the other chapters. The probe was designed for power management and for working with harvestable ambient power. The frequency of 125 kHz with bipolar coding was chosen for wireless data transmission. Two air coils are used on both sides as antennas. The proposed probe was designed and wireless data transmission was tested.
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Microwave transverter for 5 760 MHz to 146 MHz
Šustr, Jan ; Šnajdr, Václav (referee) ; Lukeš, Zbyněk (advisor)
This work deals with a design of the microwave transverter for 5 760 MHz to 146 MHz. It is divided to a few parts. The first one is focused to design of the local oscillator which generates the signal at frequency f = 116.9583MHz. The oscillator is designed like a crystal oscillator. Its output signal is multiplied and amplified in a second part. The next parts deal with design of the band pass filters. There I chose the design of the filters and did the measurements. The microwave receiver and transmitter circuits are designed with the modern monolithic circuits. The main job of this part is to design low noise amplifier and the power amplifier. At the end of this work I do the measurements and the comparison with the simulations.
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Program for design of CATV
Sedláček, Jan ; Hála, Ondřej (referee) ; Říčný, Václav (advisor)
The main task of this master’s thesis is to create an interactive computer programme for the design of small and medium television cable circuits. The first part of this document describes main conceptions of a modification and a distribution of television signals. There are also introduced basic topologies of small and medium sized distribution networks, some passive and active elements in the circuit including their usage. There is also described an algorithm for calculation of circuit’s values. The second part contains a detailed description of created programme with all of its functions. A part of this document is made by a sample calculation of the four variants of circuit and its comparison with computer calculation. In suplement are included selected parts of source code.
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Measurement and analysis of phonocardiographic signal
Všetula, Petr ; Kolářová, Jana (referee) ; Kolář, Radim (advisor)
This work is engaged in measurning and analysis of phonocardiographic signal. Effect of characteristics and parameters of used parts is examined due to quality of measurement of these signals. The emphasis is put especially on the amplifiers and microphones. The measurment is done by measure card PCI6221E. Data processing and analysis is proceeding by the help programmes, which are created in programmatic environmen LabView.
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Computer design of the small CATV
Sedláček, Jan ; Slanina, Martin (referee) ; Říčný, Václav (advisor)
Main task of this bachelor’s thesis is to create an interactive automatic programme for designing circuits of individual or small common television aerial. The first part of this document describes main conceptions distribution of television signals, parameters of coaxial cable and also some kinds of signals distortion. There are described some important mathematics formulas used for calculation of coaxial cable attenuation and carrier to noise distance important for computing function of programme. The second part describes a procedure of designing of television cable circuit of individual or small common television aerial and includes prototypal calculation of two real circuits and its comparison with results of computer calculation by which correct function of programme is verified. A part of this document is also made by detailed description of programme and its functions. Source code of created programme is included in the end of this document.
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Broadband Lownoise Amplifier
Varga, Kamil ; Havránek, Zdeněk (referee) ; Beneš, Petr (advisor)
The bachelor thesis describes the problems of broadband low-noise preamplifiers and the conditions of their design, including their printed circuit board. Furthermore, the thesis considers debugging and measuring of the most important parameters of these amplifiers. All of these problems are explained on two practical solutions.
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