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Super tranzystor :) - Forum Elektroniczne

Super tranzystor :)

Zadaj tu pytanie, jeśli nie wiesz w jaki sposób zrobić układ realizujący założone funkcje.
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helios
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Super tranzystor :)

Postautor: helios » sob 27 sie 2005, 14:33


PI
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Postautor: PI » sob 27 sie 2005, 21:56


PI
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Postautor: PI » sob 27 sie 2005, 23:29


PI
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Postautor: PI » sob 27 sie 2005, 23:53


helios
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Postautor: helios » ndz 28 sie 2005, 13:46


PI
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Postautor: PI » ndz 28 sie 2005, 21:23


helios
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Postautor: helios » ndz 28 sie 2005, 23:24


PI
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Postautor: PI » ndz 28 sie 2005, 23:55


Andy
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Postautor: Andy » pn 29 sie 2005, 9:03


PI
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Postautor: PI » wt 30 sie 2005, 0:18


helios
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Postautor: helios » wt 30 sie 2005, 14:26

No trudno się z wami nie zgodzić. Wszystko ma wpływ na poziom szumów, ale...

Szumy mogą być wynikiem różnych 'zjawisk'. Szumi wszystko, oporniki, kondesatory itp. To jest logiczne. Ale szumią też tranzystory i wg. mnie mają spore znaczenie.
Nie trafiłem niestety na netę katalogową tranzystora w której były wyrażony poziom szumów w V na pierwiastek z Hz ani na A na pierwiastek z herca. Wszędzie tylko w dB (chyba że jest jakiś przelicznik). Więc postanowiłem sprawdzić gdzie ten współczynnik będzie najniższy, niezależnie od innych czynników.

Co zaś się tyczy reszty szumiących elementów, to powiem tak... Chyba nie powinno być problemu ze znalezieniem rankingu modeli oporników z ich danymi dotyczącymi szumów (gdzieś się nawet z tym zetknąłem kiedyś). Podobnie rzecz się ma z kondesatorami. Inne źródła szumów można 'eliminować' czytając książeczki o ktorych mówicie.
Ale nigdzie jak dotąd nie znalazłem informacji o 'super tranzystorach' w ogóle, a już nie mówię o informacjach o 'super tranzystorach' dla danych aplikacji.
A ogólnie rzecz biorąc to powiem tak: na szum skałada się wiele źródeł, ale jednym z takich źródeł jest tranzystor i o nim także nie należy zapomnieć.

PS. jeśli chodzi o zastosowanie takiego tranzystora i potrzebną moc itp. to to mnie osobiście nie interesuje.


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