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Stereo audio amplifier with equalizer and remote control
Lipenský, Lukáš ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
The bachelor thesis deals with the possibilities of realization, design and construction of a stereo audio amplifier with a pre-assigned ten band graphic equalizer. The amplifier operates in class D and has an output power of 2x140 W into a 4 load, speakers. The signal adjusted by the equalizer can be amplified in the amplifier and reproduced by the speakers or transmitted to a remote receiver, such as headphones, via a bluetooth module. The equalizer has 10 bands for adjusting the frequency characteristics of the signal and the signal level (volume). The settings of the individual, predefined characteristics according to the type of music you are currently listening to can be selected using the IR remote control.
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Analog and switching audio amplifier design and comparison
Leikep, Filip ; Roubal, Zdeněk (referee) ; Steinbauer, Miloslav (advisor)
The goal of this Bachelor thesis was to design and manufacture analogue audio-frequency amplifier working in class AB and switching amplifier in class D and measure differences between them. Analogue amplifier is designed using discrete components, simulations were done in Micro-Cap. Class D amplifier will be implemented using an integrated circuit. Further in the thesis an output USB sound card is designed. It is compatible with PC and mobile phone. Audio outputs are galvanically insulated from USB to prevent the formation of a ground loop. Soundcard has two line outputs and amplifiers for two pairs of headphones. It was also measured and compared with soundcard integrated in computer. Class AB amplifier together with soundcard were built into the aluminium box.
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Class D power amplifier 2x 2 kW with switching power supply
Tylich, Ondřej ; Pazdera, Ivo (referee) ; Martiš, Jan (advisor)
The content of this thesis is a complete design of an amplifier working in class D, including a theoretical analysis. The thesis describes the functions of individual amplifier function blocks. The appropriate Class D amplifier topology is selected for the application. The design of the amplifier must correspond to the required power of 2x 2 kW to 4. The necessary calculations are performed to ensure the correct function of the amplifier. For reliability, it is necessary to select suitable terminal transistors. The thesis is a theoretical analysis of power supplies. Subsequently, a source with a suitable topology is designed, which will be designed to power the amplifier in class D. All necessary parameters are calculated, especially the power parts. The thesis deals with the design and complete implementation of the entire amplifier, starting with the design of the PCB and their production, subsequent installation, and recovery. After ensuring the function of all parts of the amplifier, various measurements are performed.
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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 audio power amplifier with Bluetooth connectivity
Bartoň, Jan ; Šotner, Roman (referee) ; Brančík, Lubomír (advisor)
This bachelor‘s thesis deals with the task of designing an audio amplifier, operating in class D, with a nominal output power of 2 x 80 W with Bluetooth connectivity, supplemented by an equalizer and a state display. A power supply and a user interface are designed as well. At first, research regarding audio amplifiers is made, followed by a more thorough description of class D operating principles. Afterwards the actual synthesis of the desired amplifier is presented, followed by the power supply design procedure. The correctness of the synthesis is later verified by simulations in PSpice and LTSpice. Theoretical design is then practically built, and its parameters are confronted with expected values by measurements.
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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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Digital audio amplifier with universal inputs
Svadbík, Pavel ; Stifter,, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This diploma thesis deals with digital audio amplifier with universal inputs and its design. The first part describes modulation and audio formats for audio electronics. The thesis contain design of a block diagram of the digital audio amplifier and describes the requirements for functional blocks. As a basic device for audio signal processing was choosen integrated circuit STA326. The thesis continue with circuits design for each blocks with a description of their principles. The next section describes the construction and firmware for microcontroller. The last part of this diploma thesis is targeted on the presentation of the measured parameters of the amplifier. The conclusion summarizes the results that have been achieved and advantages and disadvantages of the digital audio amplifier prototype.
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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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Power audio amplifier with AC/DC converter
Melša, Vojtěch ; Kováč, Michal (referee) ; Kubíček, Michal (advisor)
The aim of this work was to design and construct a simple audio amplifier, which would be based of involvement and components used in switching power sources on the maximum degree (for example from usual ATX sources for computer). The main motivation for development is the existence of many old sources that do not use and big interest of users for the construction of home audio amplifiers for small and medium power. Amplifiers based on switching power sources with greater efficiency and less weight than comparable classic amplifiers (working in classes A, B or AB). Their disadvantage is the complicated design and introduction of distortion and spurious signals to the amplified signal. This work will be described a design of simple amplifier, which will minimize these negative effects. For shortcomings and wrong parameters this proposed involvement will be eventually described and implemented design of amplifier in class D.
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