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element z CASIO MA-120 - Forum Elektroniczne

element z CASIO MA-120

Identyfikacja elementów na podstawie zdjęć i symboli, miejsca w układzie.
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w. Rybałtowski
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element z CASIO MA-120

Postautor: w. Rybałtowski » pn 07 gru 2009, 22:25

Na płytce drukowanej są trzy takie elementy. Oznaczenie na płytce to EF, na elemencie widniej 222. Element wygląda jak dwie diody zalane w jednej obudowie, jest trzy - nóżkowy. Pozostałe dwa zachowują się jak FET-y a trzeci ma przejścia we wszystkich kierunkach, co to może być?
Dzięki za podpowiedź :)

^Target
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Postautor: ^Target » śr 09 gru 2009, 0:03

dorzuć zdjęcie i napisz, czemu pacjent jest obiektem zainteresowania...
Gdzie ta płytka fizycznie się znajduje, jaką funkcję układową mogła pełnić, czemu uległa uszkodzeniu lub jakie są objawy?
Generalnie jeśli jakiś element półprzewodnikowy na pomiarze "diodowym" ma napięcia przewodzenia bliskie zeru niezależnie od kierunku, to z reguły jest uszkodzony. Dla pewności wylutuj i powtórz pomiar poza układem
chciałeś zrobić wzmacniacz, a wyszedł jak zwykle ... mieszacz :/

"Eksperci nie mają monopolu na dobre rady" - Bob Pease
nie jestem żadnym specjalistą

cmos-pl
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Postautor: cmos-pl » ndz 13 gru 2009, 9:02

222 to moze byc dioda zenera 22V 300mA PZM22NB2


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