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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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Laboratory electronic load 400 W
Horna, Aleš ; Szabó, Zoltán (referee) ; Steinbauer, Miloslav (advisor)
This thesis deals with the construction of a laboratory electronic load purpose of which is to test various sources of electric energy, for instance electronic power supplies or accumulators. The thesis states possible designs of electronic circuits forming such an electronic load, it mentions factory manufactured devices, it describes the way of designing parts of the device, choice of components, conduction of circuit simulations for function verification of designed circuits and mechanical construction.
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Voltage amplifier for Electrical field generation
Nedbal, Jan ; Szabó, Zoltán (referee) ; Kubásek, Radek (advisor)
This bachelor’s thesis is about design and practical realization of the voltage amplifier for generating an electric field defined trace. First part is introduced design of function generator and a DC power supply symmetric. In the second part is the design and simulation of power amplifier in class A and high voltage DC source. The last part is consists of measurements on a function generator, power amplifier and high voltage DC source.
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