thuc hanh ky thuat so v5.2
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L thuytcbn Giithiumt vi IC scbn Lp rp mch pht xung ngh 1Hz dng IC 555 Lp rp mch nhy ntunt dng IC 4017 Lp rp mchn giao thng dng IC 4017 Lp rp mchm m BCD 8421bng IC 7490 v hinth trn LED 7 on dng IC gii m 7447
Lp rp mchm ton chnhoc ton l trn csmchm BCD 8421
Ti liu:
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in tr Tin Ngun nui
Tn hiu xung clock (xung ng h) Mch pht n Ledn Led 7 on Mch Test Board
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in tr n v tnh l Ohm Chia lm 2 loi chnh:
Trthng
Tr cng sut ( >1W)
Gi trin tr sc theo vch mu in trn thn in tr. Trong vch chdung sai t tay phi khi c gi tr v thng cmu nh vng hoc bc
Thng thng ta s dng tr W
in tr 1/4W
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+ + nu + nh vng 22122*10^1 =220 Ohm
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Tin n v l Fara Nhng thng thng chdng n v
Pico Fara (10-12Fara) : pF
Nano Fara (10-9 Fara) :nF
Micro Fara (10-6 Fara) : uF
T ha: 10 micro FaraTgm
104 10*10^4 pF= 100nF
Di+
Ngn-Vchen-
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T khng cc tnh Thng thng l t gm, giy Cch c tr s vi t gm
Ly 2 su * 10^ s th 3 ; n v l pico Fara
Vd: 104 = 100000 pico F= 100 nano F
T c cc tnh: Thng l t ha: di + , ngn hoc ( c mt vch en chth
trn thn)
Cc thng s cn quan tm Tr sin dung
in p chu ng ti a Chn dng
Chn mVchen-
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CHC NNG T khng cc tnh: dp nhiu sinh ra tng c hoc cc
thit b khc, nhiu mi trng, T c cc tnh:
n nh in p cho Vi iu khin hoc cho cc linh kin khc
cn n nh ngun khi hot ng. T c tr s cng ln th thi gian np in cng lu v giin
cng tt hn.
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Ngun nui: Thng thng vi mch s l ngun DC 5V (cng
USB)
Ngun dng: Thng k hiu l Vcc, Vdd: L cc dng5V
Ngun m: Thng k hiu l Vss, GND: l cc 0V
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L xung vung Sn ln (Chuyn mc t 0 ln 1) Sn xung ( chuyn t mc 1 v 0) Mc 1(ton): 5V
Mc 0(toff): 0V
Sn ln
Snxung
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DIODE Cu to t lp tip gip P-N ca vt liu bn dn c im:
Chdninmtchiut P sang N ( t Anod sang Katod); khi in p tcc Asang K >= 0.7V
Nhndngcpin:Anodebtu l AAnh+
Khi dnin th s c in p ri trn thn khong 0.7V Diod nha: chn c vng mu xm l chn Katod
C dng chucnhtnh
C in p ngcnhtnh
Diod 1A:1N4007
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Led ( Light emiting Diode): l diode pht quang. c im:
Khi phn cc thun th s pht sng (VAK>0.7V) i vi diode 5mm ( ng knh), dng in qua diode hot
ng n nh l 20-25mA. Khi mi mua v, chn di hn l chn
Anode
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L khi cu kin c cu to gm 8 diode ni chungAnode hoc Katode Led 7 thanh loi Anode chung: cc Anodeni li vi nhau Led 7 thanh loi Katode chung: c ccKatode ni li vi nhau
Trt t cc thanh : a->g nh hnh
Led 7 thanh
Anode chung
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2 module ngoi () Ngang ni
Dc khng ni Chia i theochiu dc
Thng cp ngunTrong + ngoi -
Module gia (Xanh) Dc ni
Ngang khng ni Chia i theo
chiu ngang
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IC cha cc cng logic h 74 Bn cng logic 2 u vo 7400 bn cng logic NAND 2 u vo 7403 bn cng logic NAND 2 u vo, u ra h mch
7408 bn cng logic AND 2 u vo 7409 bn cng logic AND 2 u vo, u ra h mch 7432 bn cng logic OR 2 u vo 7486 bn cng logic EX-OR 2 u vo
7402 bn cng logic NOR 2 u vo
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Ba cng logic 3 u vo 7410 ba cng logic NAND 3 u vo 7411 ba cng logic AND 3 u vo 7412 ba cng logic NAND 3 u vo, u ra h mch 7427 ba cng logic NOR 3 u vo
Hai cng logic 4 u vo 7420 hai cng logic NAND 4 u vo 7421 hai cng logic AND 4 u vo
Mt cng logic NAND 8 u vo: 7430 6 cng not 7404 su cng NOT 7405 hex NOT with open collector outputs
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Bm decade (0-9): 7490 Bm BCD 4 bit (0-15): 7493 Hai bm decade (0-9): 74390
Hai bm 4bit (0-15): 74393 Gi m BCD sang thp phn: 7442 Bm decade: 4017iu khin Led 7 on: 7447 (Anode chung) IC to xung ng h: 555
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Cch tm hiu mt IC: Tm trn Google cm t: m s IC+datasheet Download datasheet v tm hiu (dng pdf)
Cch tm chn ca IC sc bn: Trn cnh ca IC khng c chn v c mt vnh
khuyt, ta t cnh ny nm bn tay tri. Chn s 1 snm v tru tin, bn di pha tay tri.i khi cmt du chm chth chn s 1.
Cc chn khctng
dn theo chi
u
ngc chi
u kim
ng h
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Cch nh s th t chn
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Ta ni n chn Katode ca n diode li vi nhauth ta s c cng logic OR n u vo
D1
D2
Dn
IN2
IN1
IN3
OUT
U1
OR3
1
2
3
4
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Mc tch cc l mc 0: ngha l khi chn ra mc 0 thdiode tngng s sng ln
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bi: hy lp rp mch to xung ng h1Hz bng IC 555
Hng dn: Download datasheet IC 555 v v lp rp theo mch dao
ng a hi nh hnh. Cch tnh chu k:
T_on = 0.693*(R1+R2)CT_off= 0.693*R2*C
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o bi: Hy lp rp mch nhy tunt 10 n led v lpli dng IC 4017oHngdn:
o Dng IC 555 to xung ngh (lytmch dao ng trn)oNgun xung clock sa vo chn CP0 v lp rp mch 4017 mchbtumoMi u ra ca 4017 nivi 1 led bngintr 330Ohm nivt.o
Munmchdng u th ly chn niv chn MR
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o bi: Hy lp rp mch nhy 3 n led theo hiungn giao thng: 5scho n; 3s cho n xanh; 2s cho n vng.oHngdn:
o Dng IC 555 to xung ngh (lytmch dao ng trn)oNgun xung clock sa vo chn CP0 v lp rp mch 4017 mchbtumo Cc u ra ca 4017 nivimch OR bng Diode xc nhs chuk sng camin. VD: 5 chn u tin nivimch OR cho n.
(Dng diode)
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o bi: Hy lp rp mchm v hintht 0 n 9 trn led 7 thanh bngIC 7490,7447.oHngdn:
o Dng IC 555 to xung ngh (lytmch dao ng trn)oNgun xung clock sa vo chn Clock 0 v lp rp mch 7490btumo Dng IC 7447 gii m nh phn ca 7490 sang led 7 thanhoNiu ra ca 7447 n 7 chn a..g ca led 7 thanh loi anode chung.
Mrng: Hy salimch trn mchm ton chnhoc ton l.
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