Realizarea oricarei scheme electrice impune utilizarea unor componente pasive (rezistoare, condensatoare, bobine si transformatoare) si a unor componente active (tuburi electronice si dispozitive semiconductoare).
Aceste piese radio sint combinate in diferite moduri si legate intre ele prin conductoare si cabluri in cazul elementelor discrete sau asociate inseparabil si interconectate electric cum sint microcircuitcle denumite circuite integrate.
Fara a intra in amanunte, vor fi prezentate unele caracteristici electrice ale componentelor pasive si active pentru ca radioamatorii sa poata aprofunda functionarea lor in montaje, sa stie cum sa lc verifice si sa le masoare.
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