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Current distribution on linear antennas
Novák, Tomáš ; Bártík, Hynek (referee) ; Nováček, Zdeněk (advisor)
This work will describe current distribution measurement problems along antenna conductor using a probe (coupling loop), which is attached to selective micro-voltmeter, which will indicate signal level (voltage). The signal level will be used for representing the current distribution. Subsequently, measuring workplace issues from generator to antenna conductor, probe and selective micro-voltmeter, will be discussed. Analysis of voltages of this link-up and additional study will be conducted. Other parameters, which complement this situation, will be calculated from the current distribution. A computer program, which calculates these parameters and speeds up the collected data processing, will be used for this process.
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Utilization of local systems for power system regulation
Kostov, Jiří ; Geschwinder, Lukáš (referee) ; Bartošík, Tomáš (advisor)
Bachelor’s Thesis deals general information about methods of regulation of elektrification systems, including basic principles of regulation of frequency, regulation of voltage and regulation of reactive and active power. Work includes information about aggregate remote control system, power plants that participate on regulation and self device for regulation and controlling of reactive power. Work engages on new options in section of regulation and his requirements for distribution sites. Part of work deals information about renewable natural energy sources and his requirements for distribution sites.
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Wireless sound transfer
Jeřábek, Vojtěch ; Bohrn, Marek (referee) ; Pavlík, Michal (advisor)
The thesis deals mainly with the possibilities of using the module nRF24L01+ for the wireless sound transfer, with as low latency, good reliability and sound quality as possible. The first part of the thesis is devoted to the description of the device and its internal structure for wireless sound transfer, even in the case of transferring multichannel sound. The thesis also describes the sound digitalization process and its requirements for the final quality. The second part of this thesis is focused on the description of the wireless module nRF24L01+, including analyzing its internal structure and the way it works. A comparison to other wireless modules that are available on the market, including its advantages and disadvantages, is also provided. The third part of the thesis is devoted to the design of the described system for an electric guitar.
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Automatic variable gain amplifier for measuring frequency characteristic of microphone
Bařinka, Václav ; Kubánek, David (referee) ; Hanák, Pavel (advisor)
This thesis deals with design and implementation of device for measuring characteristics of microphone for a laboratory of subject Elektroakustika. This device provides user with measurement of frequency characteristic of chosen microphone, via known characteristics of reference microphone and regulation loop. Thesis contains of introduction to the problem, parts selection and circuit completition, simluations and draft of the device, including it´s front panel. Thesis also deals with a problem of temperature compensation. Simulations were ran in software LTspice, circuit completition in EAGLE and for front panel draft Fusion360 was used.
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Acoustic emissions of buildings
Smažinka, Josef ; Uher, Pavel (referee) ; Rubinová, Olga (advisor)
The diploma thesis deals with acoustics with the main focus on acoustic emissions of buildings. The first part of the thesis aims to familiarize the reader with the field of acoustics as a whole. They will learn the basic concepts, quantities and relations that exist in acoustics. In the second part I focus specifically on the sources of noise in buildings and their surroundings, how can excessive noise affect health, what standards must be met and how to prevent excessive noise. The last part is devoted to practical measurements in the field, which is focused on real sources of noise in the city of Brno. The aim of this measurement is to compare the noise generated by buildings with other noises in the urban environment.
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Acoustic emissions of buildings
Smažinka, Josef ; Uher, Pavel (referee) ; Rubinová, Olga (advisor)
The diploma thesis deals with acoustics with the main focus on acoustic emissions of buildings. The first part of the thesis aims to familiarize the reader with the field of acoustics as a whole. They will learn the basic concepts, quantities and relations that exist in acoustics. In the second part I focus specifically on the sources of noise in buildings and their surroundings, how can excessive noise affect health, what standards must be met and how to prevent excessive noise. The last part is devoted to practical measurements in the field, which is focused on real sources of noise in the city of Brno. The aim of this measurement is to compare the noise generated by buildings with other noises in the urban environment.
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BJT and MOSFET transistor-based switches - educational laboratory equipment
Bartoň, Ondřej ; Langhammer, Lukáš (referee) ; Šotner, Roman (advisor)
This thesis deals with the design of new experimental laboratory equipment with bipolar and unipolar transistor switches. This work analyzes the components needed for circuit design, such as integrators, comparators, bipolar, and unipolar transistors. Designed system is going to include a functional rectangular signal generator that controls unipolar and bipolar transistor switches. These switches will be designed for current switching up to 1 A. The aim of the thesis is to verify the functionality of designed circuits using the simulation software PSpice.
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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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Wireless sound transfer
Jeřábek, Vojtěch ; Bohrn, Marek (referee) ; Pavlík, Michal (advisor)
The thesis deals mainly with the possibilities of using the module nRF24L01+ for the wireless sound transfer, with as low latency, good reliability and sound quality as possible. The first part of the thesis is devoted to the description of the device and its internal structure for wireless sound transfer, even in the case of transferring multichannel sound. The thesis also describes the sound digitalization process and its requirements for the final quality. The second part of this thesis is focused on the description of the wireless module nRF24L01+, including analyzing its internal structure and the way it works. A comparison to other wireless modules that are available on the market, including its advantages and disadvantages, is also provided. The third part of the thesis is devoted to the design of the described system for an electric guitar.
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Digitally controlled filter
Rez, Jan ; Szabó, Zoltán (referee) ; Friedl, Martin (advisor)
This bachelor's thesis deals with design of a functional prototype universal digitally controlled analog frequency filter 2th order. Part of the design is the selection of appropriate filter topology diagram and selection of an integrated circuit. Universal filter will contain lowpass, highpass, bandpass and notch filter. The filter is tuned in cutoff frequency from 100 Hz to 15 kHz. The bachelor's thesis focuses on the circuit analysis of selected concrete structure of universal filter and possibilities of digital control filters. The practical part of this thesis includes PCB design, control software for filter and graphical representation of measured results.
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