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Portable music player
Rozsíval, Adam ; Šotner, Roman (referee) ; Dřínovský, Jiří (advisor)
The thesis deals with the project of a portable music player with an amplifier in the class D. The device is powered up by connected power supply unit, eventually by built-in accumulator. Audio signal is played by bluetooth module, sound card or headphone output. Switching inputs and power supply of the accumulator is managed by a micro-controller. A correction equalizer for sound control is also embedded in the booster. All peripheries are put into a wooden baffle board. The sound is reproduced by a pair of loudspeakers.
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Design of class-D audio power amplifier
Fiala, Roman ; Götthans, Tomáš (referee) ; Brančík, Lubomír (advisor)
This semestral thesis describes class D low frequency power amplifiers and design of specific 2x100W class D power amplifier. The designed amplifier contains a second order sigma-delta modulator in which the quantization is controlled only by the delay of modulator components. This design does not include the clock generator which usually controls the quantization in sigma-delta modulators. This semestral thesis also includes design of a switched-mode power supply for the power amplifier and for the preamplifier. The PSpice program has been used for the design and verification of some sections of circuits. All designs have been built. Also basic parameters of completed circuits were measured.
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Design of switching class audio power amplifier
Bronec, David ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
This bachelor thesis is dealing with the issues of the switched category output amplifiers and its aim is to design and to construct a stereo amplifier with the energy output about 100W. The amplifier is constructed in the switched category D. The design of the corrective preamplifier with the correction of depths, heights and the balance functions is also described. Furthermore, this thesis deals with the description of the switched power supply with the TOPswitch control circuit. The design is also supplemented by the simulations and the printed circuits of each part. There are also some photographs of the device and the measurement protocol is included too.
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Audio amplifier with digital input and power and headphone output stage
Abrman, Milan ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
The aim of this thesis is design and construction of amplifier for high quality home listening experience. Device is able to process both analogue signal and high sampling frequency digital input with high audio bit depth. Scope of the thesis covers the design of all the functional units: input signal circuit, S/PDIF receiver, D/A converter, high performance class D amplifier and precise headphone amplifier for dynamic sound presentation. Thesis also cover design of all control circuits containing rotary encoder with button input, microcontroller unit, digital potentiometer and segment display.
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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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Design and realization stereophonic amplifier class D
Hradil, Jaroslav ; Háze, Jiří (referee) ; Pavlík, Michal (advisor)
The aim of this project is to design a class D stereo audio amplifier with output power of 2 x 50 W into 4 load with THD+N less than 10%. Project is divided into three parts. First part describes the principles of class D amplifiers, the second part contains actual design of amplifier and the last part presents the results of the measurements.
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Class D 2.1 audio amplifier for laboratory measurements
Děcká, Klára ; Polák, Ladislav (referee) ; Kratochvíl, Tomáš (advisor)
This semestral thesis deals with a draft and construction of the design of an class D audio amplifier with pulse width modulation. The resulting design consists of a supply protection, an active crossover and the output power stage itself. The amplifier is made in 2.1 configuration, the amplifier for mid/high audio frequency drives 2 × 30 W output into a 8 load, subwoofer drives 1 × 100 W into a 2 load. The control centre of the whole application is an integrated circuit TPA3116D2 by Texas Instruments company. The resulting audio amplifier will be used as a device for laboratory measurements.
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Automotive audio amplifier and subwoofer
Kolka, René ; Šotner, Roman (referee) ; Dřínovský, Jiří (advisor)
This thesis deals with the project of two performance amplifiers for a subwoofer and for four basic car loud-speakers. The following part of the thesis is dealing with the power circuits of the amplifiers. The control of the amplifiers is realized by processor. The thesis is also dealing with the problems caused by sound system installation in a car, and concerns mainly with the boosters position and with producing high quality subwoofer and baffle-board.
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Audio amplifier with PWM for laboratory measurements
Lelek, Martin ; Dřínovský, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This paper describes about theoretical design of class D power amplifier. Amplifier is primarily intended for laboratory measurements, i.e. measuring of major parameters of amplifier operates in this class (frequency response, slew rate, aliasing etc.). Amplifier (oncoming laboratory module) uses PWM (Pulse Width Modulation) and is constructed from separate blocks for possibility of measuring key signals trough all the structure (triangle comparation wave, analog input signal, feedback signal, PWM signal from modulator, drivers and power transistors, output signal after recontruction filters). Laboratory module is determined for laboratory power supply of safe voltage and should be produce power of several tens of watts into usual load impedance.
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Class D stereo audio power amplifier
Kazelle, Kamil ; Dostál, Tomáš (referee) ; Brančík, Lubomír (advisor)
The content of this project is design of stereo audio amlifier working in class D with output power 2x20W. Project includes also a design of preamplifier and power supply. This project is divided into the four parts. In first part the theory and problems of amplifiers working in class D is resumed, in the second the designed circuits are dicussed, in the third the results of simulations in the program PSpice are presented and the last part of project describes the realization and presents the results of measurements.
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