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Audio power amplifier with audio processor and FFT analysis
Kubáň, Marián ; Frýza, Tomáš (referee) ; Kratochvíl, Tomáš (advisor)
This thesis is concerning about design of an audio power amplifier for home listening. Amplifier involves two audioprocessors, the first one chooses one of the four avaliable audio stereo inputs. The second just sets the considered shape of frequency characteristic of one of the picked audio signal. As soon as tha signal leaves the audiprocessors, its path is divided. First route leads to the power amplifier and second one ends up in the analog to digital converter. Both audiprocessors are adjusted via IIC line by 8-bit microcontroller. The primary role of microcontroller is to enumerate frequency coefficients through the fast fourier transformation with Cooley-tukey algorithm. Result of FFT is then displayed on graphical display unit. The whole desired parametres as volume, trebble, input selection, atc., are driven with one controller and that is a rotary encoder.
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Rotary controller for PC
Olivík, Lukáš ; Horák, Martin (referee) ; Kolka, Zdeněk (advisor)
This thesis describes the Universal Serial Bus and the development of a simple HID peripheral device, connecting a rotary encoder as a control element to the host computer. This paper includes an overview of suitable microprocessors, circuit design, PCB and mechanical design, creation of a firmware for the selected microprocessor, and programming of demonstration software on the PC’s side.
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Microsolder controlled by microprocessor
Stavělík, Jiří ; Petyovský, Petr (referee) ; Macho, Tomáš (advisor)
This thesis describes circuit design and realization of the power and control system, which can hold constant temperature of solder tip. Control system is based on microcontroller Atmega328 of company Atmel, part of the work is the implementation and debugging control software. This solution allows to enter temperature by rotary encoder and to show the real temperature on LCD displey. This hardware also detects disconnection of solder tip, acoustic signals when the required temperature is reached and it holds last set temperature.
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Controlled laboratory supply
Štibraný, Miroslav ; Petyovský, Petr (referee) ; Macho, Tomáš (advisor)
Master’s thesis deals with design of laboratory supply with precise voltage and current measuring. At the beginning it presents properties, advantages and disadvantages of linear and switching supplies, based on these facts it chooses a linear type of regulator. The design continues with detailed description of power and control analog and digital circuits. The thesis includes description of taking control over the supply from the front panel or through computer. The last part is devoted to measurement results and to presentation of some static and dynamic parameters of the designed supply.
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Temperature regulator
Fireš, Martin ; Richter, Miloslav (referee) ; Macho, Tomáš (advisor)
This work deals with design and construction of the temperature regulator with a resistive load as primarily. Each structural element is described by a theoretical part which is needed for further understanding and practical solution the thesis heads for. The current output for half-wave modulation is solved in PSD control loop using temperature measurement by DS18B20. Rotary encoder, character display or PC visualization are used to controlling and displaying.
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DDS Based High-frequency circuit analyzer
Priškin, Jiří ; Brno), Tomáš Mádr (DCOM (referee) ; Šebesta, Jiří (advisor)
At first this thesis is dealing with the basic principles of network analyzers and afterwards goes to propose conception of a polyscope, as a special type of the scalar network analyzer, designed for magnitude frequency response measurement of two-port devices. As a result of this part of the thesis is the polyscope's block circuit diagram and also selection of key integrated circuits for sweep generator, logarithmic detector and control circuits. As the following part of the thesis is a design of the all basic analyzer's circuits resulting in their schematics diagrams and printed circuit boards, do assembly of all modules and mechanical construction of the instrument and look of the front panel. Some of the tasks is implementation of the firmware and personal computer application able to download measured data from the circuit analyzer via USB and generate chart in Microsoft Office Excel book.
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Microprocessor control unit with frequency synthesizer for SW radiostation
Povalač, Aleš ; Fuchs, Michal (referee) ; Šebesta, Jiří (advisor)
The thesis is focused on the development of a radioamateur short-wave transceiver. The basic functions, features and parameters are described in the introduction. The bandplan and appropriate types of emission are also included in the introductory part. The frequency synthesis module is discussed in the second part of the document. Emphasis is placed on the direct digital synthesis method (DDS) using modern Analog Devices circuits. The proposed DDS module includes a high-speed clock source. The description of an intermediate frequency module with a demodulator is also placed there. The final part in devoted to the design of a transceiver control panel with a graphical display, a keyboard and a rotary encoder. The firmware for an ATmega128 microcontroller is described in detail at the end of the thesis.
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Calibration of angular encoder
Šindelář, Michal ; Klusáček, Stanislav (referee) ; Beneš, Petr (advisor)
This master’s thesis deals with calibration of incremental encoders. Introduces basic principles and terms in the field of rotary encoders and its calibration. The first part describes angular displacement sensors. Especially it focuses on optoelectrical incremental encoders. It also includes market research of very high-accuracy encoders. The second part contains description of precision calibration techniques with uncertainty to the thousandth of an arc-sec level. In the last part, the development of a calibration stage is presented and consequently the error map of an encoder is obtained.
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Teaching guide for the ATMEL development board
Navrátil, Petr ; Hadinec, Michal (referee) ; Friedl, Martin (advisor)
Bachelor’s thesis is focused on developing applications for the developing board with microcontroller ATMEL (ATmega16). Bachelor’s thesis describes the microcontroller including a description of hardware components and control registers. This book describes the various peripherals on the developing kit with programming examples. Simple modules have been created for the developing board, which could be used to program complex project and easy aplications. On these modules are periphery as matrix keyboard, encoder, real time clock and circuit L293D for controling DC motor with PWM signal. The AVR Studio version 4.18 is described and used here as a programming software. This work should serve as a guide about ATMEL AVR ATmega series for beginning or advanced programmers. Examples of individual programs are a part of this work.
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A Fuzzy Controller for a Wind Tunnel Model
Piskoř, D. ; Mihálik, O. ; Sýkora, T. ; Arm, J.
In this paper, an alternative approach to control the model of the wind tunnel is proposed. The aim is to find out if it is possible to achieve better results in regulating a system containing nonlinearities when a fuzzy controller is used instead of common linear controllers. The designed fuzzy controller will be implemented into a PLC via automatic code generation in MATLAB later.
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