Pentru marirea sensibilitatii unui receptor in gama undelor ultrascurte se recomanda atasarea unui preamplificator ca cel prezentat mai jos. Schema din fig. 1 contine un tranzistor cu frecventa de taiere…
Mişcarea electronilor într-un sens şi altul în conductor, se numeşte oscilaţia curentului alternativ. După prima oscilaţie urmează a douaf a treia, etc. Durata unei oscilaţii se numeşte perioadă şi este…
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