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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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Preparation for function demonstration of basic types of oscillators
Venhoda, Jaroslav ; Šotner, Roman (referee) ; Brančík, Lubomír (advisor)
Bachelor's thesis deals with basic types of oscillators. Oscillators were divided into groups in the introduction. For the practical implementation was chosen four different types of oscillators. For each type of selected oscillator was done circuit design. Subsequently, the design was simulated by PC software OrCAD PSpice. The proposal includes a possibility of the control device by switching between outputs and tuning oscillator's frequency.
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Design of dual regulated power supply
Moštěk, Jiří ; Kubíček, Michal (referee) ; Brančík, Lubomír (advisor)
This bachelor thesis deals with design and construction of a symmetric stabilized power supply provided with an adjustable electronic current fuse. The concept of source is chosen as a linear with two-output voltage ranges. The first range is possible to regulate the voltage from 0V to 20V with current limit 2mA – 4A or 2mA – 8A. The second voltage range allows you to adjust the output voltage from 0V to 40V with current limit 2mA – 4A. Included in this bachelor thesis is the simulation source, testing in non-soldering field, PCB design, commissioning, draft cooling and design of structural solutions. At the end of bachelor thesis are given the results of measurements laboratory resources and photos.
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Design of class AB stereo audio power amplifier
Zatloukal, Tomáš ; Polák, Ladislav (referee) ; Brančík, Lubomír (advisor)
The following work deals with design of class AB low-frequency amplifier, which is appropriately supplemented by correction Pre-amplifier and inrush protection circuit. The original schematic from prof. Leach was edited to fulfill task and to be easily completed from discrete components. The result of this work is the final design of power amplifier and correction pre-amplifier, protection circuit for speakers and power supply. As a next part, the design of printed circuit boards will be described together with assembling and mounting of boards in a construction box. Power amplifier will be verified by simulation and hardware measurements.
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Stereo audio power amplifier with microcontroller
Filko, Patrik ; Götthans, Tomáš (referee) ; Brančík, Lubomír (advisor)
This bachelor thesis deals with designing stereo audio power amplifier, which specified functions such as control of volume, depths, treble and balance, are contoled by 16-bit microcontroler with digital potentiometers. Setting those functions is pictured on simple LCD display. Opted amplifier is easy to control ergo it finds use in wide spectre of audio devices such as ampliffing input signal from transmission audio media player or audio signal in television devices. Used design is able to be realized of easy to get components.
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Class D audio power amplifier for bass guitar
Appel, Daniel ; Petržela, Jiří (referee) ; Brančík, Lubomír (advisor)
The main goal of this project was a synthesis of audio power amplifier and preamplifier for bass guitar with features suitable for this kind of instrument. The project was divided into 6 parts. The first part is a brief introduction to classes of power amplifiers, the second part is about function of blocks of which the class d audio power amplifier consist. In the third part the designed circuits and their properties are discussed. The simulation of circuits in PSICE are also included in this part. The design of power supply unit is discussed in fourth part. In the fifth there is design of chassis and other mechanical constructions. In the sixth part, there are results of experimental measurements of the amplifier prototype. In the appendix of this bachelor thesis are enclosed the schematics, printed circuit board designs, and photographic documentation of amplifier prototype.
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Laboratory source based on switching technology
Kočí, Martin ; Kubíček, Michal (referee) ; Brančík, Lubomír (advisor)
The aim of this thesis is a description of the dierent topologies used in switching power supply and subsequent use of acquired knowledge to select an appropriate topology, power supply, using the selected topology and the subsequent construction of laboratory source as a whole. Ideological content of the proposal are part of the power source based on the topology being used in switching power supplies, also on the controller working as buck converter controlled by PWM and the control section, whose mainfeature is the 8-bit microprocessor. The design is shown working with the designprogram PXLS Expert and the program for PCB Design EAGLE. Simulation shown in this thesis are implemented in the program OrCAD PSPice. Objective is to ervive all the functional blocks as a whole and the subsequent measurement of basic parameters, which are pro- cessed graphically. All parameters are measured at the end compared with the expected parameters and the simulations generated in the ideological content. Finally, the work is to evaluate all of the results obtained and compared with the primary objective of this work.
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Sensitivity analysis in distributed-parameter systems
Kapusta, Ján ; Dostál, Tomáš (referee) ; Brančík, Lubomír (advisor)
The aim of this bachelor’s thesis was to familiarize with calculation of modified nodal analysis and its application in distributed-parameter systems. Realize evaluation of sensitivities with respect to a primary parameters R0,L0,C0,G0 and length l of transmission line. Then apply this technique on example in Matlab language using graphical user interface GUIDE. Selected technique is accelerated method based on efficient computation of matrix exponential function. The results are sensitivities of circuit values with respect to a primary parameters R0,L0,C0,G0 and length l of transmission line.
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Surround amplifier and processor for home audio listening
Šenfluk, Petr ; Brančík, Lubomír (referee) ; Kratochvíl, Tomáš (advisor)
The aim of bachelor’s thesis is design of an effect amplifier and processor for home audio listening. It includes three-channel class-D audio power amplifier supplemented with analog and digital input stages processing analog stereo signal. These input stages have a function of pre-amplifier, automatic volume control, analog filters and digital delay line, which make it usable generally in three elective modes. These elective modes are stereo reproduction, stereo reproduction supplemented with subbass channel and additional reproduction creating surround effect.
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