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Study of chaotic oscillators having passive fractal two-terminal elements
Ledvina, Matej ; Kaller, Ondřej (referee) ; Petržela, Jiří (advisor)
Táto semestrálna práca sa zaoberá chaotickými obvodmi s fraktálnymi prvkami. V prvej časti sú prezentované fraktálne prvky, ich vlastnosti a spôsob syntézy. Tri takéto prvky sú navrhnuté, vyhotovené a merané. V druhej časti je krátky úvod do problematiky chaotických obvodov, a spôsobov ich syntézy. Následne sú prezentované dve metódy syntézy chaotických obvodov s názorným príkladom. Na koniec bol vybraný jeden chaotický system ktorý bol syntetizovaný do obvodu, odsimulovaný, zhotovený a experimentálne overený.
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Circuit realizations of special chaotic dynamical systems
Kaleta, Lukáš ; Langhammer, Lukáš (referee) ; Petržela, Jiří (advisor)
This thesis deals with the circuit synthesis of two given chaotic dynamic systems. The introduction of the work analyses a theory of dynamic systems, a theory of chaos and methods of chaotic circuits synthesis. The practical part contains a derivation of circuits from specified systems of differential equations with an integrator synthesis method and polynomial expansion of resonant circuit equations. Following realization of the circuits is included. The output of the work are the results of numerical integrations of specified systems, simulations of synthesized circuits and measurements on implemented circuits. Results are in a form of state portraits and frequency spectra, ilustrating the induced chaotic phenomena.
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Comlete design of class D power amplifier
Bistrý, Jan ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
In this bachelor's project was at first described a principle of class D power amplifiers. There was performed a characteristic of particular blocks. In the concrete steps were described particular solutions of these amplifiers with PWM driver, amplifier as an IC chip and were described advantages of this topology. It was performed an overview of the modern integrated amplifiers which are currently available. According to further requirements of this bachelor's project were designed a scheme and a board of printed circuit for this amplifier. In more details were described possibilities of output LC filter and performed its simulation. At the conclusion of this project was performed a laboratory measurement of realized amplifier which verified its performance and compliance with engaged parameters.
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Autonomous outdoor system for growing plants
Schmidt, Dominik ; Lukeš, Zbyněk (referee) ; Petržela, Jiří (advisor)
This diploma thesis deals with maintaining possibilities for appropriate climatic conditions in outdoor greenhouse. The importance for growing plants is an appropriate temperature, humidity and adequate supply of water. The aim of the study is to suggest an apparatus sustaining beforehand defined conditions in the greenhouse with minimal requirements for maintenance. Apparatus uses analogue control by applying photosezistor and thermistor. For power supply are DC-DC converters used.
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All-pass filters with various active devices
Novotný, Jakub ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
The theme of the semester project is to provide an overview of the function and use of analogue all-pass filters. It deals with their specific implementation using active functional blocks, i. e. using LT1228 transconductance amplifier manufactured by Linear Technology, using transimpedance amplifier AD844 manufactured by Analog Devices and using negative three port second generation current conveyor EL2082 manufactured by Intersil (formerly Elantec). Further outlines the concept of laboratory exercises on all-pass filters with the aforementioned integrated circuits. The exercise will consist of three separate units.
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Temperature Sensor Design
Bílý, Stanislav ; Petržela, Jiří (referee) ; Hruboš, Zdeněk (advisor)
This thesis is aimed on design and realization of device for temperature measuring with signalization high temperature. The first part contains an analysis of temperature sensors. There are also included kinds, properties and comparison of sensors. The second part contains options of communication on home power line. Next part is focused on the own design of device. There is mentioned choise of components, circuit schematic and flowcharts. Last part deals with realization and testing of device.
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Stopwatch for measuring of sports events
Tajč, Martin ; Petržela, Jiří (referee) ; Hruboš, Zdeněk (advisor)
The aim of this bachelor work is the construction of the electronic stop-watch for measurement at sports events. This stop-watch is primary designed for use at firefighters competitions. The first part of the work is focused on a flowchart of the stop-watch and an analysis of its parts. Some alternative methods, which could be used during the construction, are compared. In the following part, there is an algorithm for the microprocessor applied in it described and features of programming languages are briefly compared. Next in the text, there are a detailed user manual as well as a manual for executing of the display panel. In the supplement, particular electronic schematics and printed wiring boards are included.
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Laboratory Switching Power Supply
Šneidr, Radim ; Petržela, Jiří (referee) ; Šebesta, Jiří (advisor)
The topic of my bachelor´s thesis is a solution to a laboratory switching power supply, look at their benefits, disadvantages and characteristics in terms of EMI. The aim this work is also to design the concept of two outputs switching supply with monolithic circuit, LM2576 with the inclusion of a current limiter and implementation of a test version which will use basic measuring. Further, design a general scheme and the mechanical solution of a power supply including measuring modules. Design layout of printed circuit, complemented with thorough testing.
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Utilization of circuit elements described by fractional-order dynamics in analog phase shifters
Zedka, Radim ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
This document deals with fractional passive dipole structures, their mathematical description, design methods and practical use with respect to limited frequency range. Two fractional dipole design methods are being described while one of them is used for practical realization of three fractional dipole samples. All of them are well measured and documented. Analog phase shifters implementing this fractional-order dipole are being discussed theoretically and they are practically constructed and measured. Concisely the fractional-order two-port design method implementing biquadratic filters is described.
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Matrix headphone amplifier for studio monitoring
Štěrba, Václav ; Petržela, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor´s thesis describes the design of a matrix headphone amplifier for studio monitoring. The proposed amplifier is a purpose-built device to be used in studio sound recording for the mixing of multiple audio channels directed to the interpreters´or performers´ headsets. The device is basically composed of the following parts: An input section for the audio line, a mixing section which secures the setting of individual input levels for each output, an amplifier section allowing the setting of the output signal level for each output, and an output section enabling the connection of headphones. The equipment utilizes a connection to a multi-channel audio signal bus; this bus also provides for remote power supply to all the connected devices. The solution described in the thesis can be defined as alternative monitoring that facilitates quick and easy connection of a required number of monitoring points (in other cases, such monitoring is usually realized by means of individual small mixing consoles).
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