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3D FDM printer reprap and parameters of print
Kratochvíl, Tomáš ; Dvořák, Jaromír (referee) ; Zemčík, Oskar (advisor)
This master thesis summarizes the current knowledge about non-commercial 3D printing FDM technology. The goal of this thesis is to demonstrate the gained knowledge by building a 3D printer which can partially replicate itself, and to evaluate its technological parameters. The experimental part of this work is focused on the impact of the changes in technological parameters of printing on mechanical properties of printed parts.
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Class D audio amplifier for active loudspeakers
Cupák, Jan ; Punčochář, Josef (referee) ; Kratochvíl, Tomáš (advisor)
This master's thesis deals with design of D class audio final amplifier, which was output power 400 W for 4 ? load impedance. Designed audio amplifier is specifical for active speaker, which consists of satelite speakers and subwoofer. Further more it deals also with other functional blocks, e.g. balanced input preamplifier, active crossover and protection for safety running. Outcome of this work are schemes of each functional blocks of D class audio amplifier, whose functionality was verified by simulation. Thesis also contains full reference material including mechanical arrangement of functional blocks on printed connection board. The conclusion contains the measured parameters of function blocks of produced prototype and complete photographic documentation.
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Design of Audio Power Amplifiers
Gasnárek, Jiří ; Kratochvíl, Tomáš (referee) ; Šebesta, Jiří (advisor)
The aim of the bachelor's thesis is the description of design and construction audio power amplifiers. This topic is very voluminous and therefore I limited it to basic familiarization with options of bias point placement, connection of power transistors and requested properties of audio power amplifier. It is requested to reach a balanced amplification in transferred frequency band (20 Hz – 20 kHz), to eliminate passage distortion by linearization of passages, to stabilize the amplifier by negative feedback and minimize the signal distortion in limitation by suitable concept of the DC source. Following part contains a suggestion of end transistor properties based on requested output and impendance, their choice (2SC5200, 2SA1943) and calculation of expected heat lost of the amplifier. From known transfer temperatures is set a request on an end transistor cooler. The final part deals with a sketch of scaling way of amplifiers, assumed value and objective comparison of modules. I discuss there possibility of subjective comparison by listening to the same part of sound recording via both modules.
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Power-accumulation from renewable energy sources
Kratochvíl, Tomáš ; Pavlů, Jaroslav (referee) ; Pospíšil, Jiří (advisor)
The diploma thesis is focused on problem of accumulating electric energy from renewable resources. The first section describes renewable energy sources, which are possible to use in the Czech Republic and principles of accumulating electric energy. In the following section are suggested systems of accumulating energy to accumulators by compressed air and pumped storage power station. These systems are proposed for uniform power supply from photovoltaic power station to electric power network all day. In conclusion, the suggested systems are compared from economic-technical perspective.
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Design of class D audio power amplifier for home use
Raba, Jaroslav ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
This thesis describes the design and construction of a complete audio power amplifier 2x100W of Class D. The proposal contains an active correction preamplifier unit, a power supply unit and indicator unit of the amplifier excitation. The power amplifier is composed of an integrated circuit TAS5611A from Texas Instruments. The correction preamplifier is controlled by four potentiometers. Excitation of the amplifier is displayed using LEDs. Basic parameters are measured and evaluated for all blocks of the amplifier.
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Class D audio power amplifier with integrated DSP
Borsányi, Tamás ; Frýza, Tomáš (referee) ; Kratochvíl, Tomáš (advisor)
This project deals with design and creation of a physically small, energetically effective audio amplifier, with extended tone corrections and user friendly settings. These expectations meets audio amplifier in class D with additional DSP, digital signal processor. Project includes overall design of all blocks, like A/D converter (PCM1850A), power stage together with DSP (TAS5706A), control unit (ATmega128) and power supply. In this work you’ll find theoretical description of class D, types of modulation, ways to convert analog signals to digital, short introduction to digital signal processing, options and limitations of these principles, description of specific circuits and layouts of printed circuit boards. The project further discusses the control program, its ways of solving the software for each block of the system, and finally includes the measurement of the prototype.
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Simulation of the Transmission Channels for the Digital Television DVB-T/H
Kučera, Jan ; Ulovec,, Karel (referee) ; Kratochvíl, Tomáš (advisor)
This thesis focuses on analysis, classification, simulation and assessment of the signal fading in the scope of terrestrial digital television reception. This is a phenomenon associated with signal multipath propagation caused by the reflection, dispersion and diffraction of electromagnetic waves in interaction with relief and artificial obstacles. Wave propagation issues in a specific landscape are not the central theme of this project. Signal transmission between the transmitter and receiver is defined by channel profile models. Attention is directed not only to static reception but also to portable and mobile reception. Simulation of this phenomenon takes place in the software environment of MATLAB. In the framework of this project program fundament was created which allows simulate the signal processing across the entire communication chain of television broadcasting, including its transmitting and receiving parts.
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Audio power amplifier 2 x 50 W
Skalický, Pavel ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
The topic of my bachelor´s theis is design of class AB audio power amplifier 2 x 50 W/4 with preamplifier and stereo output. The design is standard solution of stereophonic version of power amplifier, with monolithic integrated circuit 2 x LM 3886. The project deals also with preamplifier with integrated circuit LM 1036, calculation of heat sink of power circuits and solution of supply. The aim of this bachelor´s project was make complete design of laboratory prototype (scheme, layout of printed circuit, part list and placemnet, amplifier arrangement), realisation function of prototype and laboratory measurements.
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Program for digital watermarking of image data
Kalas, Ladislav ; Kratochvíl, Tomáš (referee) ; Slanina, Martin (advisor)
This project is specialized on the method generation digital watermark in pictures. Aim work is study bent on basic watermark techniques, principles embedding of watermark to the pictures and on possibilities usage these methods on protection author's rights. In terms of project was tested possibility embedding of watermark to the picture with usage programme Matlab.
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