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Power supply and protection circuits for 6-channel audio amplifier
Kryška, Vojtěch ; Balík, Miroslav (referee) ; Hanák, Pavel (advisor)
This bachelor thesis deals with designing protection circuits for 6 channel audio amplifier. Created circuits provide AC voltage filtering, current peak limitation after switching on, delayed speakers connection for eliminating crackling, automatic shut down in case of overheath, LED indication of failure and waking up from standby mode. Created design focuses on keeping all channels grounds unconnected with each other for eliminating ground loops.
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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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The design of Audio Amplifier
Schenk, David ; Bohrn, Marek (referee) ; Šteffan, Pavel (advisor)
The theme of my bachelor’s thesis is a design of audio amplifier for the reproduction signal from electric guitars. I decided to combine the advantages of tube preamp with the advantages of digital amplifiers. The work describesthe principle activity of selected involvement, includes the anode voltage filter simulation, analysis and measurement of input and output parameters and thein evaluation. Technical documentation for realization of the amplifier contains printed circuit board.
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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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Audio amplifier controlled by the IP protocol
Dvořák, Petr ; Schimmel, Jiří (referee) ; Kouřil, Jiří (advisor)
The bachelor thesis is intent on projection and realization of a device whitch is capable of communicate with a remote client through the Ethernet making use of the protocol set TCP/IP. This communication will be used for the control of analog and digital outputs of the device, which is able to be attached to any amplifier of audio signals. One of used protocols is UDP. This protocol is closely described, because it is used for transfer of data controlling outputs. The whole device is controlled by microprocessor ATmega32, which operates the communication with the ethernet interface through the controller ENC28j60, the communication with the D/A converters MCP4922 and controlling of digital outputs and a display. The device has its own IP and MAC address for identification in the network. It is possible to edit both addresses in the menu of the device with the help of the module LCD, the display of 2x16 characters with fours buttons. The audio amplifier staffed by the voltage controlled by the computing amplifiers SSM2018T is connected to this device. The amplifier is proposed as six-channel with symmetric inputs through the connectors XLR and unsymmetric outputs through the connectors CINCH. The operating programme which is able to be run on PC with the operating system Windows is necessary for the remote control of the device in the network and all functions of the device are controlled by this programme. This programme enables to control the device after setting the IP address of the destination device and the communication establishment. The motherboard is proposed as a universal module which keeps at disposal up to 6 analog outputs with the range of the control voltage 0 – 5 V and up to 21 binary inputs/outputs.
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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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Design and making of low-frequency power amplifier in class AB
Dušek, Martin ; Kratochvíl, Tomáš (referee) ; Brančík, Lubomír (advisor)
In this bachelor thesis I am occupied with low frequency amplifiers, theirs important parameters, classes and with integrations end-level. Next I am occupied with miscellaneous types of preamplifiers and additional circuits. There are simulated schemes of corrective preamplifier, protections scheme and high power amplifier in PSpice software in this thesis. These schemes and next additional modules are connected with DPS. This thesis contains result of measurement and photo functional sample.
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Laboratory module of class D amplifier with PWM modulation
Barcík, Peter ; Petržela, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor’s thesis describes basic functional blocks of class D audio amplifier. Project also discuss about design of module class D audio amplifier with PWM modulation. As this audio amplifier is going to be a laboratory module, it is necessary to divide design into designs of individual functional blocks. Finally project describes design of output LC filter which is also simulated in PSPICE program. This thesis include complete construction details. Measurement results are shown in standard protocol.
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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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