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Após implantar um resistor de 100k no acoplador da fonte,mas limpeza da placa e substituir o leitor optic
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Essa dica é bacana para descobrir a tensão de trabalho do zener quando polarizado reversamente. O ideal é que você consiga de fato ver os parâmetros do componente no manual, como corrente, tensão, potencia, etc. Mas em casos em que isso não é possível, é melhor saber a tensão do zener a não saber nada! Neste teste foi usado um resistor de 100ohms em série com o zener para captar a tensão sobressalente quando ele começar a conduzir. Se atente para esse resistor, pois se você forçar demais ele
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