MCH IU KHIN N LED

MCH IU KHIN N LED

Mch ny gm c 3 phn:Phn u s dng IC555 to ra xung clock, xung clock ny c cung cp cho IC4017 phn sau.Phn th hai s dng IC4017 to ra b m thp phnPhn th 3 ch l phn hin th.Trong mch ch s dng 8 ng ra cho 8 n led, tuy nhin chng ta c th s dng c cng Q8 v Q9 to ra mt mch nhp nhy cho 10 n.khi xung clock vo 4017 n s m theo quy lut sau

ng ra Q0 nhy ln mc 1 tng ng vi 5V (n 1 sng) sau 1 thi gian cc ngn n s xung mc 0 (n 1 tt)

sau Q1 s nhy ln mc cao 5V ( n 2 sng) sau 1 thi gian cc ngn n s2 xung mc 0 n 2 s tt

c nh th cho n ht cc n

chnh nhanh hay chm s nhy ca n ta chnh gi tr t v tr ngay con IC 555 v n to ra tc xung clockXem k datasheet mc cho ng s chn IC 555 :

S chn 4017 :

S ghp ni 20 led ( Mi u ra mc vi 2 LED ) : y chnh l mch yu cu nhm phi lm.