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Laboratory power source
Lízner, Václav ; Marcoň, Petr (referee) ; Szabó, Zoltán (advisor)
This bachelor thesis deals with the complete design and realization of the laboratory DC power source. There is designed a power supply with adjustable output voltage from 0 to 30V and with adjustable current limiter up to 3A. All output values are analog controlled, the microcontroller is used only for the voltage and current measuring. This data is shown on the LCD display. The thesis includes also participation of the DC sources, what is focused on the basic wiring of the switching DC sources.
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A Contribution to Optimal Synthesis of Filters
Szabó, Zoltán ; Hájek, Karel (referee) ; Král, Bohumil (referee) ; Sedláček, Jiří (advisor)
The presented dissertation thesis is focused on the optimization of filtering circuit synthesis. In the five main sections of this work, the author analyzes partial problems related to several areas within the synthesis of modern filtering circuits. The first chapter constitutes an examination of elementary aspects which characterize present-day integrated circuits in voltage feedback operational amplifiers, and this main content is further complemented with a view on possible application of these circuits for the designing of filtering circuits as proposed within subsequent parts of the thesis. In this context, the second chapter contains a description of the design and optimization of digitally controlled universal filters tunable by means of digital potentiometers originally produced for audio technology. These digitally controlled circuits are increasingly utilized as analog preprocessing blocks in digital signal processing systems. The most extensive portion of the dissertation is dedicated to a complex analysis of individual configurations of economical, purposely lossy active function blocks and modern voltage operational amplifiers. This part of the thesis aims at providing a detailed insight into the characteristics of individual configurations of examined circuits; furthermore, in this respect, the author proposes a comparison of various application possibilities relating to these circuits and their wider use in the field of active frequency filters optimization. The described section of the work also includes a definition and examples of application of the designed and realized program, which facilitates significant simplification of purposely lossy ARC filters. In the penultimate part of the dissertation thesis, the design, development, and verification of a suitable synthesis procedure are presented together with the optimization of data and (in particular) power models of EMC filters. Based on the verification of characteristics inherent with the designed models of EMC filters, the suggested measuring procedure related to these filters is described, including the design of a station for measuring elementary parameters of line anti-interference devices up to very high frequencies. In the last section of the thesis, the author discusses the procedure of air ions concentration measurement through an aspiration condenser and analyzes the systematic and random errors as well as the optimization of filtration characteristics of the applied measurement method. This part includes the description of the design and characteristics of the realized fully automated measurement system with an aspiration condenser.
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Wireless transmission sensors non-electrical quantities to iontmeter
Kadlček, Václav ; Szabó, Zoltán (referee) ; Roubal, Zdeněk (advisor)
Theme of this bachelor thesis is construction a meteorological station with wireless data transfer to ionteter. At first, meteorological phenomenons which most influence the concentration of atmospherical ionts are described and than suitable sensors are picked. When selecting the sensors, the greatest demands are placed on high accuracy and low power consumption of weather station. After testing of these parts the final weather station is build.
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New electronics for laser harp
Takács, Peter ; Kříž, Tomáš (referee) ; Szabó, Zoltán (advisor)
The aim of this thesis is to describe in detail the design of the electronics of a laser harp. This thesis does research on the history of digital musical instruments designed since the very beginning of electronic music. Furthermore, this paper debates over the advantages and disadvantages of the laser harp designs. This thesis lists the most common types of sound synthesis and includes the design of a power amplifier circuit. It writes about the output types this digital device has. The design of the power supply circuit and other necessary circuits, such as voltage converters, which are responsible for providing the correct voltages for all the various circuits and devices are also thoroughly detailed. The paper reviews the advantages and disadvantages of several optical sensors with different characteristics. This thesis also describes the steps of designing a High-Pass filter to filter out the unwanted ambient light. This documentation also describes a simple mist generator system, which distributes water vapor into the air. Moreover, it also describes the role of the microcontroller in this circuit and how it controls the individual elements. The thesis describes how to operate the device.
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Digitally controlled laboratory power supply
Spáčil, Petr ; Drexler, Petr (referee) ; Szabó, Zoltán (advisor)
This bachelor thesis deals with the divison and research of DC voltage sources. It also describes how linear and switch mode power supply works. The 8-bit ATmega16 microcontroller from the ATMEL family of AVR microcontrollers is further described. Part of this bachelor thesis is the desing of the laboratory power supply source 30V / 3A, which is in the topology of switched pre-regulation. The ATmega 16 microcontroller provides measurement and displaying values on the display.
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Contactless Wiegand Effect DC and AC current sensor
Štefánek, Martin ; Szabó, Zoltán (referee) ; Kubásek, Radek (advisor)
The paper describes the types of magnetic sensors, which are used for measuring magnetic fields. The document is divided into chapters, which describe Wiegandův sensor and its implementation into the magnetic sensor in this document is designed magnetic circuit design for this sensor. The work evaluates the progress in the design of contactless ammeter that measures AC and DC current via Wiegand effect. Experimental verification principle and its function for DC current is described in the penultimate chapter.
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Design of VA-characteristic meter
Štěpnička, Martin ; Szabó, Zoltán (referee) ; Steinbauer, Miloslav (advisor)
The thesis describes the design of a measuring device volt-ampere characteristics of PN junction suitable for measuring characteristics of stabilizing diodes. Describes the basic principle of PN junction and related events. Part of the text discusses how to minimize the adverse parasitic effects. Furthermore, the proposal deals with an AC adapter suitable for this device. With that analyzes marginally rectifiers, stabilizers and filters. The following is a description of the device for measurement, principle of communication with the computer and the method of data processing. The annex contains schematic design, printed circuit boards and part list.
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Broadband impulse signal generator
Kelbler, Petr ; Szabó, Zoltán (referee) ; Drexler, Petr (advisor)
This thesis deals with problem of generating very short voltage impulses. At the first, it considers the most common shapes of impulses, their parameters and relationship between time and frequency domain. Then it presents possible applications of such impulses. Following part of the thesis theoretically describes techniques for generating very short impulses and their typical conceptual schematic. The techniques for generating very short impulses are compared from different points of view and the most suitable technique is chosen for further realization. The theoretical parameters are checked by simulation. At the end of thesis, construction of designed generator is described, measured parameters are compared in time and frequency domain and the practical use of generator is characterized.
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Alarm device
Demjanics, Ferenc ; Drexler, Petr (referee) ; Szabó, Zoltán (advisor)
Timer is an equipment that allows us to provide time measure. There are in all-day use a plenty of timers, but their use is ussually limited for one purpose only. Because of this I decided to compile a timer which allows to apply it for an individual needs. This granted a wider spectre of use in real life. We used a microcontroller from Atmel, and also a DCF77 signal (atomic time signal)receiver and decoder. Further, we required a real-time circuit, DC/DC converter, and a powerswitch from manufacturers STmicroelectronics, and Linear Technology,respectively.For the imaging unit we used a graphic LCD connected via an I2C bus, which is commercially available spare part for mobile phones. Following the design we compiled and revived a hardware part of the device. After a succesfull revive, we gradually compiled a program for microcontroller. The program defines a processes for run of the device. It was written in programming language C, with use of compiling enviroment avr studio 4
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Temperature and humidity measuring station for Ionmeter
Kadaňka, Karel ; Roubal, Zdeněk (referee) ; Szabó, Zoltán (advisor)
This bachelor’s thesis describes the design of meteorological station of Ionmeter. Meteorological station is controlled by the Arduino platform, which evaluates the measured data and sends them wireless into the initial concept of Ionmeter. In the first part, the particular measured variables (temperature, humidity, pressure, carbon dioxide concentration, UV radiation and amount of dust particles) are described. It also describes the brief principle of the formation of air ions and their influence of the human organism. The following chapters are dedicated to the description of each component, the description of the weather station program and the initial concept of Ionmeter. The last chapter describes the construction of the meteorological station itself.
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