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Electronically adjustable active elements for the realization of oscillators and function generators
Bokůvka, Tomáš ; Jeřábek, Jan (referee) ; Polák, Josef (advisor)
This thesis is focused on the design, analysis and realization of new oscillator and generator circuits using electronically adjustable active elements. In the opening discussion the aspects of distribution, proposal, properties and oscillation conditions of generators and oscillators are theoretically described. Next, there are presented some electronically adjustable active elements which appear to be suitable for construction of the oscillators and generators. This covers in particular the Operational Transconductance Amplifier OTA, Voltage Control Amplifier VCA and Digitally Adjustable Current Amplifier DACA. Using these elements the six oscillators and two functional generators are presented. Simulation results and design methods are included. Next part is focused on practical realization and measurement. At the end of the thesis the measurement and simulation results are discussed and compared.
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Utilization of CDTA and CFTA elements in electrical circuits and frequency filters
Kotlán, Petr ; Herencsár, Norbert (referee) ; Kubánek, David (advisor)
Thesis deals about active component in current mode, CDTA (current differencing transconductance amplifier) and CFTA (current follower transconductance amplifier). CDTA compares two input currents. Outcome current comes trough added terminal Z to load. Caused voltage is transfered to output current by transconductance g. Output surrents shall be possitive (terminal X+) or negative (terminal X-). In contrast to CDTA, CFTA has one current input. Components were used in filters and oscillators. Some filters of second order realized simultaneously low, hight and nad pass were designed. Then, the transfer of filters with diverse topology with opperational amplifier to filter with CDTA and CFTA was shown. Some oscillators were designed. Designed circuits were simulated. Transistor models of CDTA and CFTA were created to purpose of simulation. This components can be realized by AD844 and MAX435. There are shown the conclusions of AC analysis of filters and transission analysis of oscillators. The thesis contains practical realization of second order frequency filter also. Device was made like a PCB by smd. CFTA was realized by components AD844 and MAX435.
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DRM signal receiver
Mik, Šimon ; Charvát, Jiří (referee) ; Šnajdr, Václav (advisor)
The master’s thesis deals with the design of DRM (Digital Radio Mondiale) receiver. The block diagram of receiver was chosen and particular blocks were theoretically analyzed. After that followed design and production of each block. The synthesizer was programmed and the receiver properties were verified. The last part of thesis deals with real receiving of DRM broadcast.
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Position Inductive sensor
Kořistka, Petr ; Procházka, Petr (referee) ; Huták, Petr (advisor)
Bachelor thesis deals with desing and construction of the inductive sensor. It shortly describes the history, advantages and disadvantages. Next there is developed principle of basic sensors working on the basis changes of inductivity and qualities of scanned materials. Major part of work was desing of individual parts of sensor essential to its correct function. It includes oscillator, rectifier, PI regulator, supply of tension and evaluation circuits. In the practical part was suggested PCB for individual parts of sensor. Measurement and processing of results were done.
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Function Generator
Suška, Jiří ; Kraus, Michal (referee) ; Kunovský, Jiří (advisor)
This bachelor's thesis dissert on different types of oscillators, their functions and usage in everyday life. This thesis also contains comparing several types of oscillators and possible concepts for function generator whitch will be used in course IPR.
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Analysis of tuned mass damper
Jurečka, Martin ; Rubeš, Ondřej (referee) ; Kšica, Filip (advisor)
Complex mechanical structures are often exposed to external influences that can cause excessive vibrations, which can limit their ability to perform their function or affect operational safety. Tuned mass dampers, which are focus of this thesis are very often used to avoid such vibrations. The firts part of the thesis is focused on the research of the principle of tuned mass damper and its use in engineering practice. In the secound part obtained knowlage is used to create a mathematical model of the selected mechanical system and then to implement a suitably designed tuned mass damper to damp unwanted vibrations. Part of the work i also to build a real model of the tuned mass damper, which will demonstrate its function.
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Experimental musical instrument, combining a sampler based on the tape principle and the principle of frequency modulation
Hofr, Šimon ; Indrák, Michal (referee) ; Dlouhý, Dan (advisor)
The aim of the bachelor thesis is to design and implement an experimental mechanical-electric musical instrument specified as a sampler on the magnetophonic principle, whose sound is frequency modulated. In the theoretical introduction I will describe the basic classification of musical instruments and present examples from selected groups that are close to the proposed sampler. The second chapter is devoted to types of synthesis, of which frequency modulation is the central one. The third chapter describes the design of the sampler form and its circuitry. The fourth chapter discusses the realisation and construction findings.
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Analysis of spontaneous synchronization of coupled mechanical oscillators
Nečesal, Filip ; Hadaš, Zdeněk (referee) ; Kšica, Filip (advisor)
The work explains and describes the behavior of synchronization of two mechanical oscillators. This phenomenon is demonstrated on a physical model and compared with a computational model in several experiments. My motivation was that it is a fascinating phenomenon, and the problem is close to me because of the field I study. It was based on the knowledge gained during my previous studies. The first part of the bachelor thesis deals with the research on the synchronization of mechanical oscillators, the mathematical expression of individual types of oscillations, and their properties. The second part consists of a physic model of two pendulums on one base plate and a measurement of the system. The third part of the thesis contains a mathematical model, which was compared with the physical model in last part of the work.
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Web applications supporting education of audio signals generation and processing
Tkadlec, Vojtěch ; Schimmel, Jiří (referee) ; Rajmic, Pavel (advisor)
The main goal of the diploma thesis was the creation of 3 web applications for interactive support of studying courses in the area of digital signal processing using the programming language JavaScript, the markup language HTML, and the Web Audio API interface. The topics included additive synthesis, ADSR time envelope, amplitude modulation, and approximation of 1D signals using discrete cosine transform. The written part of the thesis also focuses on the tools used for the practical part of the thesis. For better understanding of the topics, four web applications were created, and a separate web application was created specifically for the topic of ADSR envelope.
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Elektronky a jejich využití v současné elektronice
KONZAL, Petr
History of tubes. Described basic types of tubes and their properties. The possibilities of using vacuum tubes are shown on two practical examples. The first example is a fantastron tunable oscillator with a pentode. The second example is a tube monitor with an electrostatically deflected screen, to which a smartphone or set top box can be connected.
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