Jakie oporniki zastosować do diod w samochodzie 12V, aby nie spalić?

Sun Mar 14, 2004 5:57 am   

Witam.
Odrazu pisze ze jestem laikiem.
Napisze mi ktos jaki opornik mam podlaczyc do diody zeby jej nie spalic w
samochodzie?
Albo jakie stosowac oporniki zeby w instalacji samochodowej 12 V otrzymywac
napiecia 1,5V 3 V 4.5V.
Ja nie wiem jak to obliczyc a jak ktos sie zna to dla niego pestka.
prosze o jak najszybsza odpowiedz. Dzieki z gory.

Sun Mar 14, 2004 6:18 am   

mozna zrobic prosty dzielnik tylko to zalezy jeszcze od obciązenia bo jesli
duże (mały opór) to dzielnik sie nie nadaje

Sun Mar 14, 2004 6:39 am   

Za to wielkie dzieki.


A to nie jest takie wazne

Sun Mar 14, 2004 7:33 am   

Użytkownik "@" <betonn@gazeta.pl> napisał w wiadomości
news:c30088$o07$1@nemesis.news.tpi.pl...

domniewam ze chodzi ci o diody swiecace

liczy sie tak

R= (Uakum - Udiody)/Idiody

gdzie Idiody = 0,01A = moze byc 0,02A ale bezpieczniej jest (dla diody)
0,01A

Udiody - zalezy od koloru i jest w granicach 1,5 do 3V - jak przyjmiesz
1,5 - tez bedzie dzialac - maly blad bedzie



jak zmniejszyc napiecie - proste rezystor , dioda zenera, tranzystor,
ew. kawalek aluminium do odprowadzenia ciepla

Sun Mar 14, 2004 5:42 pm   

"@" news:c30088$o07$1@nemesis.news.tpi.pl

Jeżeli to ma być typowy cel diody jako kontrolka to szeregowo z diodą daj
rezystor 1 kOhm i po sprawie. Jakby diody świeciły zbyt jasno (gdy będziesz
miał jakieś tam ultrajasne) zawsze możesz zwiększyć ten rezystor np do 2
kOhm co da prąd około 5-6mA w zależności od napięcia instalacji.


Zależy do czego to chcesz użyć ?
Najlepiej zrobić to na układzie LM317 i przełącznik na odpowiednie napięcia.

Mon Oct 16, 2006 7:21 pm   

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