The purpose of this degree project was to build laboratory equipment for a new course in power electronics that starts this autumn 2010 at Uppsala University. The equipment is intended for student labs and it covers the most important areas of the course including rectifying, buck-/boost-converters and PWM-modulation. It is built as one sealed unit where all the electronics are built-in but visible and it has a connection board where students safely can connect the different circuits. The project has advanced from theoretical studies of circuit design, choosing of components and simulations to drawing the printed circuit board (PCB), soldering, case building, final testing and troubleshooting - basically most steps from an early idea to a final product. Measurements on the final product gave about the same results as the earlier simulations of the circuits and the result is overall satisfying..

Automationscenter & Bråvalla Elteknik AB is a company that offers the market completed total solutions where the customer can operate and monitor their production from the terminal. In these total solutions they lack standard circuit which are developed by the company and which could manoeuvre/control/monitor controlled process objects. This report defines the work of developing the most common standard circuits.The report is initiated by a short theoretical part about PLC and the PLC system, with a connected terminal, which has been used. Thereafter, the turnout of the demands of specification is reported, after discussing with the supervisor in the course of the project. The report concludes with a disclosure of how the programming, the documentation and the testing have proceeded and a final discussion concerning the project and proposals on continuation.The result is a CD with the documentation of standard circuits and how they are implemented in a new project.

Development and construction of an electronic Breakout box is the main work for this thesis. The box is a part of a test system for the component Fuel Flow Transmitter and should convert signals to be suitable for a frequency counter. A previously constructed Breakoutbox for this purpose is being old and needed to be recreated. So SAAB Aerotech, Aircraft services, the company for the thesis work wanted to construct a new, more sustainable Breakoutbox adapted to a more modern technology. The signals to the box comes from the transmitter and should be converted to suitable signals for a frequency counter so it can show pulse and time difference between the signals.

Norrbottens läns landsting står inför en övergång från analog till digital mammografi. I och med att det här ämnet är så aktuellt just för norrbottens läns landsting så tyckte jag att det vore intressant att fördjupa sig i ämnet. Jag ville göra en jämförelse mellan dessa båda tekniker när det gäller stråldos, bildkvalitet och diagnostisk säkerhet. För att uppnå mitt mål har jag använt mig av litteraturstudie vetenskapliga artiklar inom det aktuella området. Då jag skulle skriva om utrustningen använde jag mig av litteratur och Internet.

Syftet med följande arbete är att förstå en grupp lärares och elevers uppfattningar om kunskap samt om undervisningsformer inom ämnet Fotografisk bild. Arbetet ger en inblick i aktuell forskning om lärande i skolan. Med hjälp av en kvalitativ studie inkluderande intervjuer av såväl elever som lärare ville jag förstå deras uppfattningar om kunskap samt om undervisningsformer inom ämnet Fotografisk bild. Det framkom i min undersökning att den digitala tekniken är det som används i samhället idag, och även förändrar vårt sätt att lära och att tolka världen. Den digitala tekniken bör därför vara ett naturligt inslag i elevernas kunskapsbildning. Dessutom kan jag konstatera att den analoga tekniken har visat sig medföra positiva effekter på kreativiteten samt elevernas engagemang.

Jag har i det här arbetet gjort en analys av skillnaden mellan analog och digital summering avljudspår. Analyserna gjordes med avseende på frekvensspektrum, transientrespons och fasdifferens.Det gjordes genom att jag skrev och spelade in två låtar att använda till analyserna, mixade dessaoch körde ut till 24 separata ljudspår per låt. De summerades sedan på tre olika mixerbord och i treolika mjukvaror, för att sedan med Adobe Audition analysera hur frekvensspektrum,transientrespons och fasdifferens ändrats. Därefter gjordes genomsnitt för de analoga och de digitalasummeringarna för att se om det fanns några skillnader dem emellan. Även om det fanns gott omskillnader mellan mixerborden så var fasdifferenser det enda som var genomgående för alla analogasummeringar mot de digitala..

Transmission of digital signals is today more frequently used than transmission of analog signals. One reason for this is that a digital signal is less sensitive to noise than an analog, another reason is that almost all signals today are handled in a digital format. This thesis describes the development of a system that receives digital video signals through FireWire. The standard for FireWire, which is a high performance serial bus, is under development. Today the standard of the bus supports transmission of data with a speed of up to 400 Mbit/s.

AnSyn AB är ett företag i Linköping som utvecklar programvara för att optimera analog elektronik. I deras program Analog Dimensions finns en visualiseringsmodul som ritar upp de kopplingsscheman som elektronikkonstruktören arbetar med. Ansyn var inte nöjda med den lösningen de hade. Den gamla visualiseringsmodulen hade flera begränsningar och i denna rapport kan du följa arbetet med att ta fram en ny visualiseringsmodul. Arbetet resulterade i en helt ny visualiseringsmodul som saknar de begränsningar som den gamla visualiseringsmodulen hade.

This paper examines how and if the understanding of wedding photography has changed during the shift of technology - from analog to digital photography. It examines if the changed conditions due to the shift of technology have changed the habits and conditions for the photographers working with wedding photography. It furthermore examines what impact these habits and conditions have had on the pictures of weddings. The investigation is based on interviews of six photographers that have worked professionally before and after the shift of technology, as well as of pictures by the photographers taken before and after the shift of technology.Use of time and space has changed due to the shift of technology. The change has also had an influence on hierarchy among the photographers.

This master?s thesis deals with integrating simulations using Agilents Electronic Design Automation tool ADS with customized Matlab scripts, for solving complex analog and digital radio architectures. In particular, it addresses predistortion, realized in the digital domain, of power amplifiers, modeled in the analog domain. The former is implemented in Matlab while the latter is implemented in ADS. Two versions of integrating the two systems have been tested: 1) Iterative approach on sample basis and 2) Scheduled batch solution by matrix inversion.

This Bachelor thesis examines the possibility of replacing an outdated, analog video recording system to a digital counterpart. It is key that the video and audio signals remain synchronized, generator locked and time stamped. It is up to nine different video sources and a number of audio sources to be recorded and treated in such a manner which enables synchronized playback. The  different video sources do not always follow a universal standard, and differ from format as well as resolution. This thesis aims to compare a number of state of the art commercial of the shelf solutions with proprietary hardware.

The report descripbs how a diplexer for a hybrid analog/digital filterbank has been constructed and tested. A diplexer divides the frequency band into two different bands that do not who doesn't overlapp each other. The sampling rate for the two ADC:s is 80 Msps, and therefore it is advantage to have zero at 80 MHz. The reason for this is that a proposed class of hybrid filterbanks with very good quality requires a zero at or close the sampling frequency to work well. The diplexer was made in three versions.

Ja.

Projektets mål var att utforma och konstruera ett mätinstrument för att upptäcka variationer i ljusintensitet. Uppdraget gavs av avdelningen för fasta tillståndets elektronik på Ångströmlaboratoriet i Uppsala. Instrumentets tänkta användningsområde är att undersöka om avdelningens testuppställningar för belysning av solceller levererar en homogen ljusintensitet. Genom att placera instrumentet på olika positioner under ljuskällan ska eventuella avvikelser i intensiteten kunna avläsas. Kraven på instrumentet var batteridrift och att det skulle vara handhållet.

Thermia Värme AB is one of the market leading manufactures of heat pumps. In order tomaintain this position, the company wants to improve the vibration characteristics of theirproducts. The aim of this thesis is to develop product design changes that lead to a reductionof vibrations in the heat pump Thermia Diplomat 8.The main cause for vibrations in the system is flow pulsation and mechanical forces inducedby the scroll compressor. Vibration is transmitted through the compressor piping and receivedby the heat exchangers, from where it is further transmitted to the connection points for theradiator and heat source circuits.A number of design changes in order to improve the vibration characteristics have beenevaluated through calculations and practical experiments. The changes have included thecompressor and heat exchanger mountings, the compressor suction and discharge line pipingand also pulsation dampening.The results of the experiments show that the vibration levels in the connections for the heatingand brine circuits can be decreased strikingly through changes in suction and discharge linepiping.