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Six-channel audio preamplifier with common volume control
Spilka, Benedikt ; Balík, Miroslav (referee) ; Hanák, Pavel (advisor)
The main aim of this bachelor thesis is to design and to construct a low-frequency six-channel preamplifier with remote and local control and with symetric and line input for up DPA223 low-frequency amplifier. The preamplifiers must have galvanic separation together. Its gain/amplification must be remote controllable from mute to 0dB and locally from 0dB to -20dB. Low distortion, noise and other parameters monitored in audio technics are important for the design.
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Electric Volin with MIDI Output
Spilka, Benedikt ; Vrba, Kamil (referee) ; Schimmel, Jiří (advisor)
The main aim of this diploma thesis is to design and to construct a electric violin with MIDI output. This thesis include design and conctruction of violin pickup, violin electronic and software for translation of sound into MIDI messages. design of the instrument´s body is presented at the end of the thesis. Violin electronic include circuits for filtration, amplification, processing and AD/DA conversion of audio siganl. Software for MIDI transfer recognizes notes and translates them to MIDI messages.
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Guitar tube preamplifier with digitally controlled presets
Malinčík, Ondrej ; Pavlík, Michal (referee) ; Háze, Jiří (advisor)
Aim of this work is design of guitar tube preamplifier which tone corrections and gain control is controlled electronicaly using digital potentiometers with ability to saving these values to memory. This work analyses and discuss used circuitry in design and presents demonstration of possible replacement of mechanical potenciometer with digital one in the conclusion.
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Design of switching stereo audio power amplifier
Christen, Jiří ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
This work deals with complete design of switch - mode audio power amplifier. The first part of the work describes basic principles of power amplifier operating in switch mode and differences between classes. Specific parts of the amplifier are analysed according to function and construction. The second part includes particular design and construction of the class D switching amplifier with a minimal output power 2x80W. The power stage is realized by an integrated circuit TAS5630 from Texas Instruments. Basic states of the power stage are signalized by LED diodes. The design includes correction preamplifier for adjusting volume and frequency response. The appliance is supplied from switch - mode power supply. Basic parametres were measured for individual parts.
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Mixing board with class-AB output amplifier
Krolák, David ; Šotner, Roman (referee) ; Brančík, Lubomír (advisor)
Bachelor thesis deals with the type of mixer preamplifier with active tone control for each of four inputs. This preamplifier is used at dance parties, concerts and recording songs if it equipped with a line output for recording device. The thesis also includes design of power amplifier in class AB with output power 2 × 100 W at 8 nominal load, simulations and a summary of the results.
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Program for design of CATV
Sedláček, Jan ; Hála, Ondřej (referee) ; Říčný, Václav (advisor)
The main task of this master’s thesis is to create an interactive computer programme for the design of small and medium television cable circuits. The first part of this document describes main conceptions of a modification and a distribution of television signals. There are also introduced basic topologies of small and medium sized distribution networks, some passive and active elements in the circuit including their usage. There is also described an algorithm for calculation of circuit’s values. The second part contains a detailed description of created programme with all of its functions. A part of this document is made by a sample calculation of the four variants of circuit and its comparison with computer calculation. In suplement are included selected parts of source code.
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Design and Implementation of Active Loudspeaker System with Digital Input
Uchytil, Filip ; Balík, Miroslav (referee) ; Schimmel, Jiří (advisor)
The work is focused on a design of an active loudspeaker system with a bi-amp amplifier and a digital input. There is described the theory of a loudspeaker enclosure design and its practical implementation. Furthermore the work deals with a design and construction of input circuits such as a preamplifier, Baxandall tone control, active crossover, all-pass filter and S/PDIF. On the basis of the amplifier´s theory the optimal construction of amplifiers and their design are selected. The complex design of the loudspeaker box is devised so that it would reach a maximum acoustic power during the preservation of a low distortion.
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Hybrid microphone preamplifier with variable selection of amplifier technology
Musil, Tomáš ; Levek, Vladimír (referee) ; Háze, Jiří (advisor)
This diploma thesis deals with a basic description of dynamic and condenser microphone, its performance regarding polar patterns and a type of mechanical construction. It also describes a principle of operation of a triode. The thesis deals with selecting of a suitable type of microprocessor to control microphone preamplifier functions. Last part contains a power supply and microphone preamplifier circuits design using a semiconductor and vacuum tube technology.
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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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