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Power audio amplifier used for laboratory measurements
Herceg, Erik ; Petržela, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This Bachelor thesis deals with the scheme of low-frequency amplifier in AB class which is going to be used for laboratory measurement. The scheme was realized with semiconductor components and the power part of the amplifier was made of bipolar transistor. The main part of the work was focused on the measurement protocol. The functionality of the amplifier was verified and simulated in the theoretical way and met the criteria. The form of the measurement protocol was realized in agreement with instructions and contains all the required parameters of the measurement. The objective of this thesis is to explain how to design an amplifier and to illustrate the measurment methods of its parameters
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Realizations of mathematical model of wind turbulations as lumped electronic circuits
Bürger, David ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
This semester work deals with implementation of the mathematical model known as modified Lorenz system as an electronic circuit with lumped parameters. Dynamical system is autonomous, deterministic and is described by a set of first-order ordinary differential equations. Our aim is to derive three different circuitry realizations each having specific properties. In the first case realization is canonical in the sense of the integrator block conception where the internal system parameters are adjusted by three potentiometers. Second realization represents modification towards independent adjustment of all four system parameters and, consequently, to tracing dynamical evolution of model solution. Last oscillator, on the contrary to previous circuits, work in current mode rather than voltage regime.
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Analog Guitar Multieffect
Zapletal, Ondřej ; Petržela, Jiří (referee) ; Staněk, Miroslav (advisor)
Presented thesis is focused on guitar effects used for sound modification produced by an electric guitar. The main aim of this thesis is an introduction into guitar effects topic and the design of selected types chosen as follows: overdrive, noise gate and delay. Final multieffect is created by these mentioned components. Another part of presented thesis is the design of source feeding the whole final multieffect. Furthermore, the design of chosen components is presented in this thesis as well as the including of control simulations and PCBs.
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Filtering structures for fotovoltaic power stations
Hruška, Petr ; Dostál, Tomáš (referee) ; Petržela, Jiří (advisor)
This thesis is dedicated to an issue of vibration of photovoltaic panels, which manifests itself primarily in the acoustic field. From the photoelectric effect is gradually getting through photovoltaic cell, panel, string, power plant to define the causes of the vibration. The aim of the work is to design electrical low pass filter that suppress disruptive elements, which prevents audible vibrations of panels and the whole system of photovoltaic power plants.
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Fully analog aquarium for growing tropical plants
Domanský, Ondřej ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
The aim of the thesis will be to clarify issues relating to the cultivation of tropical plants in aquariums. The main aspect of the work is to analyze the ideal environment for the home aquarium and the choice of specific components for plant growth. In the next sections will illustrate also the proposal of such a system and its implementation in ambient conditions.
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Design of class-D amplifier for subwoofer
Brázda, Jakub ; Petržela, Jiří (referee) ; Brančík, Lubomír (advisor)
This work is focused on design high performance D class amplifier for subwoofer. The type of amplifiers and their parameters are described. The next part of work is design of preamplifier with active low-pass filter. Preamplifier enable set dividing frequency, phase and volume. The switching power supply of forvard topology id design for a both devices. The design od all part is supported by calculations and simulations. For every device is design PCB. The appearance of device is designed so that it can be placed into the speaker box.
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Guitar electron-tube amplifier
Kokolia, Martin ; Petržela, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
The objective of this bachelor’s thesis was to design a low-frequency tube amplifier optimized for use with electric guitar. The preamp is equipped with ECC83 triode tubes as voltage amplifier and cathode follower for connection with a simple frequency corrector. The output of the FX loop allows the connection of external effects. The power amplifier is realized by dual-action 6L6 tubes and phase invertor with ECC81 triode. Output transformer allows impedance matching for speakers. The power supply uses a GZ34 rectifier tube and diode bridges. Text of thesis also includes theoretical design of guitar tube amplifier and documentation of realization of functional prototype.
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Power-supply generating specified current pulses
Svoboda, Karel ; Petržela, Jiří (referee) ; Šotner, Roman (advisor)
This bachelor’s thesis deals with generation of current impulses, which can be defined in range of few ampers, to resistive load. The first part of this project is focused on analysing of single circuit´s concepts and posibility of theirs analog control. The next part of this work describes whole setup of designed circuit. This thesis includes simulations from PSpice and signal snapshots from an oscilloscope, which prove the functionality and parameters of the whole device. Final section of this work discuss all results achieved during design proces.
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