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Design of correction preamplifier for conventional record-player
Košarišťan, Miroslav ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
The aim of the work is to suggest the correction preamplifier for conventional record – player, show preferences for these types of wirings. Schematic action vacuum tube, its division and marking are in the first part of the work, further work attends to theory pick – up head and recording characteristics, correction preamplifier, its corrections and design wiring with vacuum tubes. Next part of the work includes comparing wiring on base vacuum tubes and semiconductor base, where main emphasis on quality vacuum tubes sound is placed. Realization of correction preamplifier and creation of the printed circuit board in Eagle program is important part of the work. Part of realization is source anode voltage and filament power supply. Measured values, show modern record – players and power supply are mentioned in the end of the work.
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Design of preamplifier for guitar effects generation.
Müller, Radek ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
The topic of my bachelor's project is preamplifier blueprint for creation of certain guitar effects. Output signal from an electric guitar is often modified for musician's needs. My objectives are to discover options of signal modifications, electronical solution of preamplifiers and final effect on sound character. My targets are to design and construct two chosen guitar effects, which will distort the output sigal from an electic guitar. Both wirings will be tested by computer simulation and then will be compared with real circuit wiring. Its necessary to box up the printed circuit board and place control and signal elements to accesible place.
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Computerized measurement of characteristics of analogue functional blocks
Pšeno, Daniel ; Urbanec, Tomáš (referee) ; Brančík, Lubomír (advisor)
Aims of this bachelor`s thesis were design laboratory appliance with controlled sources and programming in graphic development software VEE by Agilent. The appliance will be including all four types of controlled sources. It will be applied on place of computerized measurement system in laboratory of Analogue electronic circuits. Program will be working with all of measurement devices on work place. PC is connected to all measurement devices by GPIB bus. In the first part of this project is talked about computerized measurement system work place, graphic development software, about programming of devices and designed four programs in VEE. In the second part of this project are included simulations of all types of controlled sources in software PSpice. Optimal ratio constants are set up by the simulation output. Printed circuit board is designed in Eagle software.
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Audio pre-amplifier for two satellites and subwoofer
Štaud, Stanislav ; Brančík, Lubomír (referee) ; Kratochvíl, Tomáš (advisor)
The aim of this thesis was to design, simulate and construction audio pre-amplifier for two satellites and subwoofer and monolithic amplifier for subwoofer in the class AB. Audio pre-amplifier provides bass, treble and switch loudness volume control. It includes subsonic filter and active crossovers Sallen-Key with approximation Linkwitz-Riley. There are low noise operating amplifiers LM833 and TL081 at the place of active amplifiers with very low distortion. End-amplifier can delivers power 50 W to 4 ohms. Of consists delayed switch speaker and supports security against direct voltage on the output of amplifier.
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Class AB audio amplifier for two satellites and subwoofer
Cupák, Jan ; Brančík, Lubomír (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor’s thesis deals with design of AB class audio amplifiers. Further more it deals also with other functional blocks, e.g. preamplifier, tone equalizer and active crossover. Outcome of this work is a complete solution of the amplifier with it's simulation. In final solution is also included scheme of a high quality power supply unit, speaker protection and heat sinks for high performance transistors. In this project is also included a solution of task about optimal mechanical arrangement of the single parts in the case of this amplifier. This thesis contains results of measurement and photo document of functional prototype.
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Tube microphone preamplifier
Čacký, Adam ; Hruboš, Zdeněk (referee) ; Brančík, Lubomír (advisor)
The theme of the master´s thesis is design a microphone preamplifier which uses vacuum tube as a main amplifying element. Part of the work is theoretical assumptions for the optimal design and implementation of peripheral involvement, comparing the properties of components used and the resulting parameters of modeled device. The thesis also includes a proposal of the source unit for supplying all parts of the preamplifier. The results are accompanied by circuit simulations and laboratory measurements of the main parameters of the designed device.
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DAC converter for CD/DVD player
Vomočil, Vojtěch ; Brančík, Lubomír (referee) ; Kratochvíl, Tomáš (advisor)
Bachelor thesis deals with the design and construction of D/A converter used in the area of audio signals with digital interface SPDIF. In the theoretical part of the thesis the design of block structure of the D/A converter module is included with assumption on realization by receiver of the digital signal Cirrus Logic CS8414 and D/A converter CS4334. In the practical part of the thesis the detailed wiring scheme of D/A converter, printed circuit board design, parts layout and construction design for implementation are presented. In the experimental part of the thesis the functionality of the D/A converter is tested and verified including the measurement results. Measured results are presented in the form of standard protocol. D/A converter can be used as stand alone module and connected to CD or DVD player. At the converter outputs audio amplifier and speakers can be connected.
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Design of sound reinforcement system
Košarišťan, Miroslav ; Hruboš, Zdeněk (referee) ; Brančík, Lubomír (advisor)
This Master´s thesis deals with sound apparatus. The first part is a theoretical explanation of the main part of the equipment, such as microphones, amplifiers, proofreaders, switches and speakers. Another section is devoted to the design itself, starting with the block diagram which is followed by the design of single important parts. These are made as PCB. For select-ed diagrams there is an example of PSpice program simulations and the measurement of important characteristics. The essential part of the work also addresses constructional pro-cessing of apparatus. At the end of this thesis some examples of the PCB are introduced.
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General-purpose power supply with microcontroller
Jorda, Ivo ; Vyskočil, Pavel (referee) ; Brančík, Lubomír (advisor)
The aim of this thesis is design of adjustable switched mode power supply with symmetrical output of 25 V, and switched mode power supply with fixed output voltage of 5 V. Required maximum output current of each outputs is 3 A. At the beginning of the paper function of the basic SMPS topologies is described. Next all reqiured SMPSs are designed and chosen parts of the design are simulated. In the second half of the thesis assembly and testing of PCB are described as well as functions of programs. Last chapter contains results of meassurement of power supply paramters.
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