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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Návrh a konstrukce baskytarového předzesilovače / Design of bass guitar preamplifier

Müller, Radek January 2012 (has links)
This thesis deals with analog bass guitar preamplifiers and related functional blocks such as equalizers and bass effects. The first part contains a theoretical analysis of individual functional blocks preamplifiers and principles as well as an outline of the design and construction principles. In the following section is presented a design of connection that involves a bass guitar preamplifier, including an equalizer, an integrated distortion effect and an amplifier for headphone output. The proposed connections are simulated in the PSpice program and the printed circuit boards design is carried out using the Eagle program. Based on previous results, the construction of a bass guitar preamplifier is realized. The parameters of the individual blocks are measured and compared with the simulations.
2

[en] STUDY OF POLARIZATION MODE DISPERSION COMPENSATION IN OPTICAL / [pt] ESTUDO DA COMPENSAÇÃO DA DISPERSÃO DOS MODOS DE POLARIZAÇÃO EM SISTEMAS ÓPTICOS

LUIS CARLOS BLANCO LINARES 07 August 2003 (has links)
[pt] Neste trabalho é desenvolvido um modelamento matemático para os elementos que compõem um sistema de compensação de PMD de primeira ordem, visando obter alternativas de solução para a metodologia de controle do sistema de compensação. Um algoritmo de controle utilizando uma lógica simplificada, diferente das encontradas em outros sistemas de compensação, é desenvolvido. Os resultados das simulações matemáticas, das diferentes partes do sistema de compensação e do algoritmo de controle desenvolvido, são comparados com resultados experimentais, obtendo-se uma excelente concordância. Um protótipo de um compensador de PMD de primeira ordem, utilizando diferentes topologias de compensação, é implementado e os resultados experimentais apresentados. Os resultados experimentais obtidos demonstram que a performance do protótipo desenvolvido é melhor que à obtida com outros sistemas de compensação desenvolvidos por outros grupos de pesquisa [22, 60]. / [en] In this work a mathematical model for the elements of the first order compensation system is developed to obtain alternative solutions of control methodology of the compensator. A control algorithm, using a simplified logic, different from the ones found in other compensation systems, is developed. The mathematical simulations results of the implemented model for different parts of the compensation system and of the control algorithm are compared to the experimental results showing good agreement. A first order PMD compensation prototype is implemented, using different compensation topologies. The experimental results are presented, proving a better performance when compared to the experimental results obtained by other research groups [22, 60].

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