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Forum Elektroniczne • efekt świetlny led nie działa
Strona 1 z 1

efekt świetlny led nie działa

: pn 07 mar 2005, 20:00
autor: bf214
Cześć !
Jest układ na 10 diod w którym diody mają zapalać się kolejno.
Jest zrobiony tak: generator taktujący na ucy7400, licznik 7490 i dekoder 7442. Wyjście generatora jest podłączone do wejścia TA licznika, wyjścia
QA QB QC QD licznika do wejść ABCD dekodera. Wejścia kasujące licznika RO1 i R02 są podłączone do masy. Świeci ciągle tylko ostatnia dioda. Nie mam testera, sprawdzałem stany diodą: generator
działa, dioda włączona między masę a jego wyjście miga. Wyjścia licznika: QA 1, QB 0, QC 0, QD 1, czyli rzeczywiście wychodzi 9.
Podmieniłem układy 7490 i 7442, nic nie pomogło. Sprawdzałem połączenia, są w porządku. Poradźcie coś, tyle się narobiłem a to dziadostwo nie chce działać ! :(

licznik

: wt 08 mar 2005, 0:26
autor: XX
Licznik zlicza do dziesięciu (czyli dziewięciu) i się zatrzymuje. Teraz trzeba go zapętlić - czyli reset i liczymy od początku i tak w kólko.
Zegar podajemy na pin1, R01, R02, R91, R92 (piny 2,3,6,7) do masy.
We A(pin14) do QD (pin 11), dalej bz.

: wt 08 mar 2005, 1:02
autor: Gość
Dzięki za odpowiedź
To co już teraz mogę powiedzieć, to że 6 i 7 nie były do masy. Resztę
zmian sprawdzę ew. poprawię.
thx jeszcze raz
pozdrawiam

: wt 08 mar 2005, 20:10
autor: bf214
OK podłączyłem 6 i 7 do masy i zaczęło liczyć (generator był podłączony do TA, TB było podłączone do QA).
pozdrawiam