El video presenta la llegada del niño Raúl Chavéz que, con tan sólo 11 años, obtuvo la medalla de bronce en la Olimpiada Internacional de Matemática (IMO ), realizada en Alemania.
"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS DO MAL"
“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”
“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”
domingo, 7 de fevereiro de 2010
sábado, 6 de fevereiro de 2010
Constructing Your Power Supply- Layout Considerations
Robert Kollman
ABSTRACT
Laying out a power supply design is crucial for its proper operation; there are many issues to consider
when translating a schematic into a physical product. This topic addresses methods to keep circuit
parasitic components from degrading the operation of your designs. Techniques to minimize the impact
of parasitic inductance and capacitance of filter components and printed wire board (PWB) traces is
discussed, together with a description of the impact that PWB trace resistance can have on power
supply regulation and current capacity. A general overview of thermal design is also included as well as
sample temperature rise calculations in a natural and forced-air environment. Finally, some practical
examples of power stage and control device layouts are reviewed.
Assinar:
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