CU TO IC 4017 29/09/2010@21h52, 3784 lt xem, vit bi: godsky
Chuyn mc: chuyn ngnh MCH NG M KHA IN DNG NH GI DNG IC4017 TN : v
thnh trung MSSV: 0502367 1.Gii thiu IC 4017 y l mt IC chia tn rt
hay vi h s chia tn t 2 ti 10
Ic 4017 c 10 ng ra ring bit tun t l 3 , 2, 4, 7, 10, 1, 5, 6, 9,
11 Chn s 16 l chn ngun Vcc Chn s 8 l chn ni mass Chn s 12 l chn
chia h 5 Chn s 14 l ng vo xung CLOCK Chn s 13 l chn ENABLE Chn s 15
l chn RESET
Biu din dng tn hiu ng ra theo tn hiu vo xung Clock
2.mch ng m kha in dng nh gi kiu
Mch iu khin cc kha in ng m theo thi gian gm 3 phn Phn pht xung
nhp : Mch dng IC555 rp thnh tng dao ng , tn s ca tn hiu xc nh theo
tri s ca R1, R2 v t C1. Xung nhp ly ra trn chn s 3 c dng5 xung vng
, xung ny dng kch b m h c 10 ca IC4017 Phn m dng IC4017 m s xung
kch thch .IC4017 m theo h c s 10, mi xung vo qua chn s 14 s lm cho
mt chn ng ra chuyn ln mc cao .Chng ta c th dng mc p ny ng m cc
relay. Khi IC4017 m n xung th 10 th n s kch cho con IC4017 th hai
chy . y ta dng ba IC4017 ng vi hng chc hng n v v hng trm c ngha l n
s t 0 -999 Mch ng m cc tip im : trong mch dng cc relay ng m cc tip
im. Chng ta thy khi chn B ca mt ng ra bt k no ng vi (0-999) chuyn
ln mc
cao th chn B ca transistor c cp dng v transistor s dn in cp dng
cho cun dy v lc ny relat ng tip im . Kha in SW1 dng reset h m v chn
s 15 khi t mc in p cao th ic4017 s b reset tr v trang thi u tin Cng
khm ph IC 4017: y l 1 mch th nghim chy 4017 Khi lp rp mch chy thc
t, bn nn lp tng phn, sau khi chy th phn chy tt ri th mi nn lp phn
tip theo. Nh y, mnh lp mch to xung clock trc, v n gin mnh dng IC
4093 c cng NAND (Xem datasheet 4093). y l mch sau khi gn trn Bread
board, nu bn cha bit dng Bread board th hy xem bi vit ny: Hng dn s
dng Breadboard.
Tip theo bn hy thm IC 4017 vo, chn to xung Clock t IC 4093 s ni
vo Clock input ca 4017. Thng thng th chn RESET v ENABLE c ni t. ng
qun cp ngun cho 2 IC nh.
By gi bn th gn output 0 ra 1 LED ni tip vi 1 con tr 680 ohm.
Tip n bn gn thm tr v LED vo output 1 v 2. ng tho ngun cung cp ra
nh, nh vy bn mi thy c l LED s sng mi ni mi khi n lt mc cao ca
n.
Ni thm cho 10 output, nu Bread-board khng th c th gn thm, bn
chiu rng Bread-board c 2 ci khc kt ni nhiu Bread-board. Bn c th
tham kho cch sp xp linh kin hnh di y.
iu chnh b m:
By gi thay i mch 1 cht, 2 chn RESET v ENABLE ni xung t qua tr
10k ohm. Ban u, trng thi ca mch khng thay i. Bn hy to 2 dy ni ri 2
chn ra ngoi ri tip tc lm theo hng dn.
iu g s xy ra khi bn ni chn RESET vo +9V? IC s quay li m t 0 v
LED output 0 s sng. Mc d xung CLOCK vn kch nhng mch m ca bn s dng
li.
Th ni chn RESET vo output 5 (chn 1) ca 4017. Mch n s bt u li
nhng khng phi tt c cc output c kch. Cc LED ca cc output 0 n 4 s chy
nh trc. V bn s khng thy iu g xy ra ti output 5, bi v khi mc cao xut
hin output 5 th lp tc chn RESET c kch hot, v mch s chy li t 0. Nh
vy bn c th rt ngn b m theo mun ca mnh. By gi hy rt chn RESET ra, t
li nh c, mch m chy nh lc u. V hy xem no, u g s xy ra khi bn ni chn
ENABLE ln +9V? B m s dng li, nhng m LED cui cng vn sng. Mch m s dng
li bt c khi no chn ENABLE mc cao. Bn gn chn ENABLE vo output 7 (chn
6) ca 4017. Mch m s chy v dng li khi n 7. By gi bn th gn chn RESET
vo +9V. IC 4017 s tr v 0 v bt u m ln, dng li ln na khi m 7. m lin
tc theo quy nh trc: Bn c th dng 4017 iu khin nhng s kin lin tc xy
ra, v d nh n giao thng. VD bn lm mch in c 3 n tn hiu v s sng theo
quy nh:
y l mch nguyn l:
Cc Diode 1N4148 dng to cng OR.
