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Real Time Recorder of Events
Nezval, Tomáš ; Kosina, Petr (referee) ; Šandera, Josef (advisor)
In this bachelor project I have been working on the design and construction of a device for storing 8 bits information on a SD/MMC memory card. The main problems are: storing of data on a memory card by microcotroller PIC in a way that will be readable on a PC (TXT file); implementation of file system FAT16; storing the data in defined time intervals by RTC (real time circuit), and ensuring the overall design enables minimal consumption of the battery power supply.
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Optimalization of power supply for LED light sources
Koždoň, Jakub ; Kosina, Petr (referee) ; Boušek, Jaroslav (advisor)
This work focuses on description of function, analysis of degradation process, measuring lifetime and design thermal and electrical driving circuit for LED. Lifetime power LED basically depends on their working temperature. So some methods for measuring and determine LED lifespan and impacts which affects their lifetime are going to be described. Driving circuits are one of keys of element lamps. Their characteristics can affect lifetime of all lamp. So some properties and impacts of circuits for driving LED's and their functions which are necessary need to know in design will be described . I'll also catalogue some circuits which are suitable for that and show particular design power supply for LEDs and it's realization.
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The lamination of Low Temperature Co-fired Ceramic
Hudeček, Ondřej ; Klíma, Martin (referee) ; Kosina, Petr (advisor)
Master’s thesis deals with the optimalization of low-temperature cofired ceramic lamination process that affects the final quality of 3D structures (eg., channels, cavities, membranes, etc.). The paper evaluates the influence of lamination parameters (pressure, temperature, time) on the formation of defects in the structure, which were detected by appropriate methods. The last parts describes designed and simulation cooling water system using LTCC technology.
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SMS gateway with respective software
Bednář, Petr ; Kosina, Petr (referee) ; Jan Šeda, OSA, o.s., Praha (advisor)
This work deals with the problem of creating a text communication between computer and mobile phone users via short message service. The basic focus of work is a grouping of all relevant information leading to the security of communication as the easiest way. One section is aimed at creating the enabling devices to send and receive short text messages and the second describes the software solution aimed at handling equipment and to ensure communication with the third-party software solutions using .NET platform from Microsoft.
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Capacitance measurement of high-voltage PN junctions
Derishev, Anton ; Kosina, Petr (referee) ; Boušek, Jaroslav (advisor)
The work deals with the capacitance measurement of high-voltage PN junctions. The work is divided into theoretical and practical parts. The theoretical part presents insight into the fundamental properties of PN junctions and methods for measuring of the capacitance of PN junctions, primarily by C-V measurement. In the practical part, several kinds of measuring circuits are introduced and a suitable method of measurement is found. The calculations of basic parameters - the width of the base and resistivity are presented and discussed. The results were compared with the values obtained by calculation from the technological parameters of the junction.
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