|
|
Electronic tester of capacity and internal resistance of batteries and accumulators
Machala, Pavel ; Kubánek, David (referee) ; Lattenberg, Ivo (advisor)
This work deals with the design and realization of electronic tester of capacity and internal resistance of galvanic cells. In the begining is situated the familiarization with basic concepts and features of galvanic cells. There are also described appropriate methods for measuring capacity and internal resistance. These principles are aplied into the design of electronic tester which is described in detail in the next chapter. The designed device is controlled by a microprocessor chip ATmega16, whose software is thoroughly described in the second part. In the end you can find the results of testing and assessment of these tests.
|
|
|
Frequency filter
Suchánek, Tomáš ; Kubánek, David (referee) ; Káňa, Ladislav (advisor)
The main objective of this thesis is to design and implement integration that will be building block for tunable active filters 2nd range of low , high and band pass through the jet structure Sallen - Key. This work first examines the use of different types of frequency filters, the detailed design of the components and selection of a suitable operational amplifiers for participation. Practical part focuses on the production of the finished product, measure its parameters resulting in graphs.In implementing are used software such as simulation programme Micro-cap and layout editor Eagle.
|
|
|
Diode shaping circuits for generators of periodic signals
Podhorský, Jiří ; Kubánek, David (referee) ; Koton, Jaroslav (advisor)
Subject of this bachelor’s thesis is designing two types of nonlinear diode shaping circuits for generators of triangle periodic signals. Thesis consists of diode circuit theoretical analysis and their design and calculation of circuit singles elements. After design printed circuit boards, complementing and recovery equipment, was made laboratory measurements of harmonic distortion. The results of measurements were compared with specified parameters and in conclusion was determined that specified parameters were fulfilled.
|
|
|
Current-mode tunable frequency filters
Prekop, Pavel ; Kubánek, David (referee) ; Jeřábek, Jan (advisor)
In first part of my bachelor’s thesis I deal with the matter of frequency filters, types of transferential functions, possibilities and reasons using active filters. In next part of my thesis I submit various types of active elements especially elements working in current mode. My thesis also deals with various techniques that we can use when creating frequency filters. In last part of my thesis I submit design some filters, as well as final simulations in a OrCAD software.
|
|
|
Using repeaters to enhance cellular communication signals
Kubásek, Ondřej ; Kubánek, David (referee) ; Koutný, Martin (advisor)
This thesis examines possibile applications of RF repeaters to improve the mobile networks signal coverage. An overview of various types of repeaters is given, while advantages and disadvantages of particular types are discussed. The questions of antenna isolation and resulting repeater gain settings are solved here as well. The thesis also considers a proposal of repeater system to improve the signal coverage in the trains of the České dráhy, a.s. company. This proposal analyses the questions of signal penetration and propagation in trains, possibilities of implementing repeaters into carriages, system diagnostics and the financial issues. The proposal is supported by the results of a trial measurement taken out in the cooperation among T-Mobile Czech Republic a.s., Vodafone Czech Republic a.s., Telefónica O2 Czech Republic a.s., České dráhy a.s. (Czech Railways Company) a ČD-Telematika a.s. on the Prague – Ostrava line.
|
|
|
Transmitter of PD MIDI messages
Čepl, Josef ; Kubánek, David (referee) ; Káňa, Ladislav (advisor)
The bachelors thesis consider in problems of MIDI communication in musical industry with a view to control external sound module assist in user-simply equipment. For the realisation were chosen facilities such as microprocessor, keyboard and LCD display. Product will extend possibilities of usage musical instruments which, except playing, doesn’t dispose the ability to control external MIDI compatible modules. The transmitter will involve to MIDI system from between instrument and possible reflected end use device. Software will specialize on programming language C, which is one of the most wide-spread. There is development environment freeware WinAVR which supports even C language. Technology of AVR programmers will allow implementation of the program to microcontroler. The first part of thesis is analyse of MIDI interface used in commercial reachable musical systems from specification of the interface to types of messages. The second part contains of detail solution with aspect on it’s practical use to potentional user. The conclusion sumarizes of work and possible other updates and actualizations of manufacture.
|
|
|
Sensitivity analysis of frequency filters with current active elements
Kupčík, Petr ; Koton, Jaroslav (referee) ; Kubánek, David (advisor)
This bachelor´s thesis is about sensitivity analysis of frequency filters with current active elements. Includes theory of sensitivity analysis and sensitivity function. There are two second order multifunction frequency filters analysed. The first one is filter with Current Mirrors and Inverters (CMI). The second one is filter with Current Operational Amplifiers (COA). Conclusion is description how tolerances of passive and active elements affects frequency characteristics of filters and comparison of these filters in light of sensitivity. Next chapters are occupied by another two analyses: Parametric Sweep and Monte-Carlo. These analyses are applied on two fourth order frequency filters with Differential Input / Output Current Followers (DIOCF) and also on two previous second order filters (only low-pass filters). Parametric Sweep is applied on internal parameters of active filter elements (not in case COA). During Monte-Carlo analysis passive elements have tolerance 5% and active elements are considered ideal. Conclusion is description how tolerances of passive elements (Monte-Carlo) and parametres of active elements (Parametric Sweep) affects frequency characteristics of filters.
|
|
|
Monitoring interference in the mains supply
Jirčík, Zdeněk ; Kubánek, David (referee) ; Zeman, Václav (advisor)
This semester thesis describes design of electronic device adapted to monitoring of mains supply. Theoretical parts describes mains supply analysis, communication and management of files to memory. Next part is design electronics blocks and their cooperation. There are description of mains analyzer prototype and it’s parts and functions. Prototype was submitted to test measurement.
|
|
| |
|
|
USB controlled voltage and current source
Pytela, Ondřej ; Kubánek, David (referee) ; Lattenberg, Ivo (advisor)
This diploma thesis is focused on complete construction of lab source which is controlled and powered by USB in personal computer. Different types of possible solutions are mentioned and finally one of them has been picked up as a best choice, which is developed in the rest of this thesis. Besides hardware construction there is also shown creation of main program for PIC18F14K50 microcontroller and main application that provides controlling of USB source via personal computer.
|
guest ::
