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PCBs Repairs with BGA and FC Packages
Buřival, Tomáš ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
Graduation thesis is specialized on dilemma of the integrated circuits with ball grid array. Chapter two describes several types of packages and confrontation of their characteristics. Chapter three considers possibilities of corrections these boards bedded with packages, mounting and demounting of these packages, method of camera control and also inspection of the soldering process. Chapter four attend to practical measuring of thermal profiles and their optimalization.
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Solder Joint Quality based on Heating Factor
Kučírek, Martin ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
Master’s thesis in the theoretical part analyses the heating factor (Q), which has significant share on quality of a solder joint. The practical part describes the design and production of test PCB and setting temperature profiles, SMD resistors soldering by using BiSn solder paste. Shear tests of SMD solder joints were realised and evaluated including isothermal ageing samples. At the end of master’s thesis solder joints visual aspects and defects were evaluated, measurement thickness of intermetallic compound by not only optical microscope but also SEM, discussion about results and Q was evaluated.
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Dynamic electroneurostimulation and electrical properties of skin
Špeta, Marek ; Dvořák, Petr (referee) ; Špinka, Jiří (advisor)
The focus of this diploma thesis is on theoretical basics of dynamic electroneurostimulation, which is an effect of electrical signal on acupuncture points of skin. This technology is used in devices made by russian DiaDENS company. Practical part of this thesis covers design of human skin impedance model. Especially derivation from three-element Cole-Cole model. Elementary, there is design of equivalent circuit of constant phase element and its incorporation into circuit. Then this circuit is designed, simulated and produced. Resulting product is used as a load to measure the characteristics of the DiaDENS device.
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Electrotechnic firm logistic
Dvořáková, Ivona ; Vaněk, Jiří (referee) ; Špinka, Jiří (advisor)
The thesis paies logistics and this firstly from aspects production of the process in theoretic introduction. In the next part of thesis interprets technology projection, capacity calculations and planning. The theory is ending characterization monitored company. The practical part work forms analysis input data prejudicing calculations capacity utilization company and characterization project calculation. The capacitive calculations utilization company for traced period are enclosed at the close this thesis.
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IoT Manual Soldering Station and Technology Aspects
Němec, Ivo ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
This thesis explores the Internet of Things, its applicability in soldering stations and its possible benefits in terms of quality control of the manual soldering process. The thesis summarizes the basic description of IoT, its historical development, possible threats and today's implementation in various devices. Furthermore, the principle of soldering stations and the IoT features implemented in them are described. Last but not least, possible benefits of IoT applicability in soldering stations are presented, such as services to make the manual soldering process more traceable and controllable.
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Organic semoconductors materials
Černošek, Michal ; Starý, Jiří (referee) ; Špinka, Jiří (advisor)
This bachelor thesis deals with organic materials and parts made of this materials. Described are also principels of their functions, structure of whore part and issues linked with production. Next are refered advanteges and disadvantages of those parts. Described are also events which occures during using organic parts. Attention is given to light emitting diods. In experimental part is measured electrical attriburtes of PLED structures, exposed to different sources of illumination. Influence of illumination to transfer of electrical charge is examined too
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Evaluation of gas flow in the scintillation detector at different profiles and sizes of holes in the screens that have shaped the network
Truhlář, Michal ; Špinka, Jiří (referee) ; Maxa, Jiří (advisor)
This work deals with the flow of gas in the scintillation detector. Thesis describes the function of an electron microscope, the composition, distribution and development of microscopes from the earliest to modern. The work also includes familiarization with SolidWorks 3D modeling in which is the electron microscope modeled and Cosmos FloWorks in which they are carried out simulations of gas flow. The paper is focused on the flow of gas in various shapes of the screen and various pressures in chamber of specimen. The results of the analysis of both apertures variants are compared with the request to minimize the pressures in the trajectory of the secondary electrons of well as in the chamber of specimen.
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