electronic workbench 5
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HNG DN S DNG PHN MMELECTRONIC WORKBENCH 5.12
Hin nay, vi s h tr ca my tnh vic th nghim v ch to ccmch in tr nn n gin hn nhiu. Nh c nhng phn mm h trny, cho php ngi ch to tn thi gian cho vic th nghimnhiu ln trn thc t v vic thit k thun li hn nhiu. C rt nhiu
phm mm lin quan n thit k v m phng in. Trong gii hn biny, xin gii thiu vi cc bn phn hng dn s dng phn mmELECTRONIC WORKBENCH 5.12. y l mt phn mm m phngtrc quan v in t, d thao tc vi ngi s dng. n hin thi c phin bn 10.0. Tuy nhin, chng ti vn gii thiu phin bn 5.12
v vn c rt nhiu bn s dng phin bn ny, v nhng phin bn sauny c nng cp t cc phin bn trc , cho nn t phn c sny bn c th tm hiu d dng hn i vi cc phin bn cao hn.
Ti liu hng dn gm hai phn:
PHN TRA CU: Dng tra cu cc chc nng ca cc cng clm vic ca phn mm ELECTRONIC WORKBENCH 5.12. Gm ccloi sau:
Cc thanh chc nng Th vin linh kin Thit b o kim
PHN THC HNH: Gm
Cc bi thc hnh c bn Cc bi thc hnh nng cao
V TR CA EWB TRONG MN HC C.A.A
C.A.A.l tn ca mn hc Gii tch mch vi s tr gip mytnh, vit tt t thut ng ComputerAided Analysis. tin cho victrnh by trong gio trnh, ngi vit xin c php dng thut ng vit
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tt ny thay th cho tn mn hc "Gii tch mch vi s tr gip mytnh" trong ton b gio trnh in t. y l mt mn hc c rtnhiu cc trng i hc, cao ng trn ton th gii s dng. N trang
b cho sinh vin cc kin thc c bn v my tnh, t sinh vin c
thphn tch mch, h thng in qua cc cng c m mn hc h tr.Xin ng nhm thut ng "phn tch mch" y theo ngha l "cc nguyn l lm vic ca mch", m hy hiu theo hng phn tchchi tit tng linh kin thnh phn tham gia mch... k c ca ngithit k, t c th phn tch u nhc im ca mch, gip ngi sdng cng c d dng hn trong vic ci tin mch theo hng mnhmun. Tu vo tng trng, tng ngnh, tng cp hc, cc cng cc trang b trong mn hc cng khc i. C th vi cc trng thinv thit k, ngi ta s dng Matlab; cc trng ch yu thc hnh c
th dng Electronics Workbench (EWB), Pspice, CircuitMaker,Orcad ... Ti b mn in t trng i hc s phm k thut Tp HCh Minh, chng ti s dng EWB v Pspice. Tm li, phn mmElectronics Workbench chnh l mt cng cm mn hc C.A.A muntrang b cho sinh vin. Ngoi cng c l phn mm EWB, mn hcC.A.A cn trang b cho sinh vin ngnh in t cc kin thc v mhnh ton hc ca cc linh kin in t, gii thiu v cu trc phncng my tnh ...
l mt cng c, th chnh bn thn phn mm ny khngth t n thit k nn mch in, m n ch tr gip ngi thit ktrong vic tnh ton: ngha l nu ngi s dng khng bit thit k th
phn mm ny cng chng thit k c g ngoi cc v d mu mangtnh minh ho. Khng nn hiu thut ng EDA (Electric andElecctronics Design Automation) l phn mm c th t n thit kc mch in. Chnh xc l n ch lm cho vic thit k tr nn ddng hn nh vo tc tnh ton cc nhanh ca n. C mt cu ni cv dn d nhng din t rt chnh xc trng hp ny, l:"Vi my
tnh, nu ta a vo rc n s cho ra rc".
Trong cc phn mm m phng hin nay, EWB l mt trongnhng phn mm thc dng nht. Do vy sinh vin s c nhiu thunli khi tip cn vi phn mm Electronics Workbench.
MT S C IM
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yu cu ni ngi s dng EWB phi c c mt trnh c bn nhtnh.
Nhng nu ch nu nhng u im m b qua nhc im th tht lphin din. "Nhn v thp ton" nn sn phm con ngi to ra cng
khng trnh khi nhng sai st nht nh. Chng trnh EWB vn tnti mt s nhc im sau:Do EWB dng phng php Newton-Raphson gii quyt
cc mch in phi tuyn, ngha l khi gp cc linh kin phi tuyn EWBs tuyn tnh ho chng v th s dn n cc sai s. Khi cc sai s nycn nm trong dung sai c ch nh trc trong qu trnh phn tchmch (trong menu Analysis), th kt qu vn c hin th. Nu sai sny vt qu mc cho php, thng tin bo li (Error) s hin ra v vic
phn tch s b hy b, trong khi mch thc t c th vn chy tt.
Do EWB ch yu nh tnh t nh lng, v d vi mt transistor BJT:Pspice cng thi im dng n 14 thng s m phng trong khiEWB ch c 10. Nn sai s xy ra kh ln. iu ny cng l gii v saocng mt cu hnh my tnh, mch in, cc yu cu phn tch... EWBchy nhanh v t b "treo" hn Pspice.
Tnh lin thng gia cc phn mm ca EWB cha cao: nunh Pspice v Orcad (lc cha st nhp) c th dung np d dng rtnhiu phn mm v v phn tch mch khc th EWB khng c ddng nh trn.
Vi nhng c tnh va phn tch trn, ta nhn thy EWB rtthch hp cho cc lp thc tp, trung cp hoc cng nhn lnh ngh. V y yu cu chnh l nh tnh; cn nh lng l khng cao. c bitrt thch hp i vi cc k thut vin sa cha in t (s, trung lncao cp), EWB c th xem nh mt bn th "cao cp".
PHN I : CC THANH CHC NNGSau khi vic khi ng phn mm EWB 5.12 hon tt, vo phn mm
ta thy trn mn hnh my tnh c cc thanh nh sau:
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THANH TRNH N
THANH CNG C
xem cng dng ca cc thanh trn, hy click chut trn cc biu
tng tng ng m bn mun xem.
THANH TRNH N
Thanh trnh n cha cc lnh menu chnh. Trong lnh menu chnh c
cha cc lnh menu con h tr cho vic m phng mch in.
1. File:
Trong trnh n ny cha cc lnh nh sau:
- New: M ca s thit k mi cha c t tn
(Untitled). Nu chuyn sang mt mch in
khc, chng trnh s nhc lu li mch in
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trong mn hnh thit k trc khi m mn hnh
thit k khc.
Khi khi ng chng trnh, ca s thit k
mch mi s t ng xut hin.
- Open: M mt tp tin mch in c lu
trc y. Bnh thng, hp thoi Open s xut
hin. Nu cn thit c th chuyn i qua li
gia cc a hay cc th mc c cha tp tin
cn m. Chng trnh ch m nhng tp tin c
phn m rng l : *.CA*, * .Cd*, v *.Ewb
(trong mi trng Windows).
- Save: Lu tp tin mch in hin hnh. Thng
thng, hp thoi lu tr tp tin s xut hin. C
th chn th mc hoc chuyn i a trong
hp thoi l tr. i vi ngi s dng h iuhnh Windows, phn m rng ca tp tin mch
in s l .EWB t ng cng thm vo. V d :
mch in c tn l DaoDong s c lu li
di dng tp tin ca chng trnh l :
DaoDong.EWB.
- Save As: Khi mun chuyn i tn tp tin t tp tin gc th chn lnh
Save As v tp tin c s khong thay i. Ch : tp tin trong phin bn
5.12 s khng th m c trong phin bn 5.0. Ngc li, cc tp tin
trong phin bn 5.0 sau khi lu li v chuyn vo danh sch nhng
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tp tin ca phin bn 5.12 s c cng trnh hiu nh l tp tin mc
nh ca phin bn 5.12.
- Revert to Saved: Phc hi mch in theo cch lu cui cng.
- Import... : Chuyn tp tin ca chng trnh SPICE c phn m rng
l *.Net hay *.Cir trong h iu hnh Windows thnh dng s
nguyn l.
Ch : chng trnh Electronics Workbench s ch nhn din nhng
im ni nhau trong mch, nu bng s im ni cho php ca chng
trnh. Nu vt qu s lng cho php th chng trnh s thay i tnnhng im ni v v cung cp nhng thng tin mi ny trong hp
thoi.
- Export...: i vi nhng ngi s dng h iu hnh Windows, bt
k mt tp tin mch in no lu tr theo nh dng tp tin c phn m
rng l *.Net, *.Scr, *.Cmp, *.Cir, *.Plc. Chuyn s nguyn l ca
chng trnh sang phn mm khc c h tr thit k mch in.
- Print...:
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Boolean Expresstion : ch in biu thc Boolean trong my chuyn
i Logic.
XY Plot : ch in th theo hai trc X v Y trong cc bng thng k
thng s ca mch in.
- Ch : Th t trang in s hin ra khi nhp chut vo cn in. Ch
nhng c ch hin ra l c th in c cn cc ch m th khng
chn in ra giy c.
- Print setup: Sau khi chn lnh ny, hp thoi Print Setup s xut
hin vi cc thng s in chun t c th thay i li cc thng s
cho my in v nh dng cho hnh nh, kh giy, ngun giy v mt s
chn la khc. Nu mch in qu ln, n s t ng tri rng v in ra
vi s giy nhiu hn s giy d tnh.
THANH CNG C
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Ngay di thanh trnh n chnh l thanh cng c. Thanh ny cha cc
cng c iu khin vic m phng tng t nh khi click t menu
nhng nhanh hn. Do ngha ca cc biu tng trong thanh ny
ging nh trong thanh trnh n nn y gio trnh ch nu chc nng
ca tng nt trong bng sau .
New: m tp tin mi.
Open: m mt tin lu.
Save: Lu tp tin ang hin hnh.
Print: cho php in.
Cut: ct mt phn t a vo Clipboard
Copy: Sao chp tp tin.
Paste: Dn tp tin t Clipboard vo mn hnh hin
hnh.Rotate, Flip Horizontal, Flip Vertical: xoay chuyn linh
kin.
Create Subcircuit: To mch in ph tr.
Display Graphs: cho php hin th ci du.
Component Properties: Chnh sa thuc tnh
Zoom In, Zoom out: phng to thu nh i tng.
T l xem mch in trn mn hnh.
Help: hng dn bng ting Anh.
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PHN II : TH VIN LINH KIN
Khi m mn hnh giao din chnh ca EWB 5.12, ngaydi thanh menu hin hu thanh th vin linh kin. y
chnh l ni EWB cha cc linh kin phc v cho vic
m phng. Thanh ny c dng nh sau:
Ni dung trong tng hp cng c trong thanh ny
trnh by qua bng sau (Nhp chut vo biu tng ca
tng hp linh kin xem chng loi linh kin):
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Sources : cha tt c nhng b ngun c sn trong
chng trnh Electronics WorkBench bao gm ngun
Pin (Battery), ngun xoay chiu (AC voltage source),
ngun mt chiu (Vcc source), ngun pht sng FM
(FM source).
Basic : cha nhng thnh phn c bn c trongmch in t c thit k sn trong chng trnh
bao gm in tr (Resistor), t in (Capacitor), r-le
(Relay), bin p (Transformer), tip im...
Diode : cha nhng kiu Diode c sn trong
Electronics WorkBench bao gm Diac, Triac, Diac,
Thyristor, diode Shockley, Led, Diode zener, cudiode.
Transistors : cha nhng linh kin thuc h
transistor bn dn c sn trong chng trnh bao
gm transistor BJT; JFET knh P, knh N; MOSFET
knh N, knh P; GaAS FET knh N, knh P.
Analog ICs : cha nhng b khuch i thut ton
bao gm b khuch i thut ton 3, chn, 5 chn
(5-terminal opamp), 9 chn (9-terminal opamp), b
so snh (Comparator), mch vng kho pha (phase-
locked loop).
Mixer ICs : cha cc vi mch lai bao gm nhng b
chuyn i Analog sang Digital v t Digital sang
Analog, mch n n (Monostable), vi mch 555.
Digital ICs : cha nhng vi mch s cho chng
trnh EWB 5.12. Bao gm nhng vi mch thuc h
74XX, 741XX, 742XX, 4XXX.
Logic Gate : cha cc cng logic c trong chng
trnh m phng nhcng NOT, AND v cc IC cha
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PHN III: THIT B O KIM
Thit b o lng c ct gi trn thanh cng c linh kin v nmtrong biu tng cui cng ca thanh, biu tng y c mang tn :
Instruments.
Khi biu tng c kch chn. Lc ny, ca s Instruments
hin ra: cha 7 biu tng ca cc thit b o lng.
ly thit b s dng trong vic kho st dng sng hoc o c
cc thng s k thut ca mch in, hy di chuyn con tr n mt
biu tng, bng tn ca thit b s hin ra. Nu ng thit b cn chn,
ta ch vic click v r chut n v tr d nh t thit b.
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tm hiu tnh nng ca tng thit b o kim, hy click vo tng
biu tng trong bng sau:
Multimeter: ng h o vn nng (V; O; A; dB).
Function Generator: My pht sng: sin, rng ca, vung.
Oscilloscope: Dao ng k hai tia.
Bode Ploter: My v gin Bode.
Word Generator: My pht t (t 16 bits).
Logic Analyser: My phn tch mch logic.
Logic converter: B chuyn i logic.
BI THC HNH C BN: ELECTRONIC
WORKBENCH 5.12.
Cc phn trong phn ny l cc bi thc hnh c bn cc bn lm
quen vi cc s dng chng trnh, cc bi tp n gin vi 6 bi nhsau
Bi 1: Mch chnh lu Bi 2: Mch khuch i Bi 3: Mch dao ng 555 Bi 4: Thanh ghi dch
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Bi 5: Mch m Bi 6: n giao thng
BI 1: MCH CHNH
LU
Kho st mch chnh
lu bn k nh hnh
v sau:
1.Mc ch - yu cu :
- Gip cho cc bn cng c kin thc v mch chnh lu .
Nm vng nguyn l hot ng v cch thit k mch
chnh lu theo s nguyn l . Bit cch la chn cc
linh kin t thanh cng c v o c cc thng s k thut
ca mch nh vo cc thit b o.
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m ca s Basic. Trong ca s Basic va m, bn hy
chn nt c biu tng in tr v ly n ra mn hnh tng t
nh ly diode (xem cc bc ny phn thc hnh).
Do chng trnh mc nh i vi in tr l nm ngang
v vy, cn phi xoay cho in tr nm dc bng cch
nhp chut chn in tr cn xoay sao cho in tr bin
thnh mu , v sau nhp chut vo nt Rotate
(Phm tt Ctrl + R)trn thanh cng c (lnh ny s xoay
linh kin mt gc 900 theo chiu ngc chiu kim ngh).
Sau khi nhp vo nt Rotate, in tr s xoay mt
gc 900
so vi lc u.Trong hp linh kin Basic, chn t in khng cc
tnh (Capacitor), nhn v ko n vo mn hnh thit k,
t vo v tr thch hp v th chut.
Cng nh i vi in tr, t in cng nm ngang
theo ch mc nh ca chng trnh v cc bn hydng lnh Rotate xoay t in ny theo chiu dc tng
t nh cch xoay in tr trnh by trn.
V cng chnh trong ca s Basic, cc bn dng chut
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Bc 3 : Chn tr s v nhn cho linh kin .
Trong bi tp ny, gi tr ca cc linh kin l: R = 1K, C
= 50mF, V = 24V/50Hz/0 Deg, Diode loi D1N4001.
Nhp chut phi vo linh kin th ng (R,L,C...), mttrnh n tri xung s xut hin, nhp chut vo lnh
Component Properties.
Ca s Properties ca linh kin tng ng s xut hin,
trong bng Label hy nhp tn Rvo Label, gi tr vo
bng Value.
Nhp chut vo nt OK khi nhp xong.
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Nhp chut phi vo Diode, mt trnh n s s xung.
Trong trnh n ny, bn hy nhn chut chn lnh
Component Propeties.
Ca s Diode Properties xut hin. Trong ca s ny,
hu ht cc linh kin u c t ch mc nh
(default) l l tng (ideal). Do , chn loi Diode
D1N4001 th cc bn hy chn lnh Modelsv chn tnnh sn xut linh kin l internattrong ct Library . Sau
, hy chn loi D1N4001trong ct Model.
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Cui cng, chn nhp chut vo nt OK.
Nhp chut phi vo ngun AC Voltage Source,trong
trnh n s xung hy chn lnhComponent Properties.
Sau khi chn lnhComponent Properties,ca s AC
Voltage Source Propertiesxut hin. Trong ca s ny,
bn hy chn lnh Value v tin hnh thay i gi tr cangun bng cch nhp gi tr 24 (n v V) trong
Voltage(V); nhp gi tr 50vo Frequency (n v Hz).
Sau hy nhn OK chp nhn cc thng s va nhp
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vo.
Bc 4 : Ni mch theo s nguyn l c th ni mch c d dng v nhanh chng th
cc bn hy tin hnh nh sau.t mi tn con tr ngay ti mt chn ca cun s cp
bin p sao cho xut hin mt chm en, lc ny nhp v
gi chut ri ko n u dng ca ngun in. Khi thy
ti y cng xut hin mt chm en th cc bn hy th
chut ra. Kt qu l ta c mt ng ni mch.
t con tr ngay ti chn cn li ca cuc s cp bin
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p sao cho xut hin chm en, ri ko chut n u m
ca ngun in. Khi thy xut hin chm en th hy th
chut ra.
t mi tn con tr ngay ti chn Anode ca Diode, sao
cho xut hin du chm en. Sau bn hy ko chut
n mt u th cp ca bin p, khi thy xut hin chm
en th hy th chut ra.
t mi tn con tr chut ngay ti chn Catode ca
Diode sao cho xut hin chm en, ri ko chut n chn
dng ca t in. n khi thy xut hin chm en ti
chn dng th bn hy th chut ra.
tcon tr chut ngay ti chn in tr, khi xut hinchm en th hy ko chut n ni vi im gia caon dy ni Diode v t in sao cho xut hin chm trn
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nh ri th chut.
t mi tn con tr chut ti chn cn li ca in tr
sao cho xut hin chm en ri ko chut n ni vi
mass.
`t mi tn con tr ngay ti chn cn li cha ni dy
ca t in, sau khi xut hin chm en th nhp chut v
ko n im gia on dy ni ca in tr v Mass. Khi
thy xut hin mt vng trn nh th bn hy th chut ra.
t mi tn con tr chut ti u cn li ca cun th
cp bin p, khi xut hin du chm en th nhp chut v
ko n im ni Mass chung ca t in v in tr.
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Lu :
C i khi, cc bn cng thc hin cch ni mch nh
trn, nhng ng ni mch khng c kt dnh li vi
nhau. Lc ny, cc bn phi lu n vic kt ni ca
chn linh kin, i vi mt chn linh kin ch cho php cc
bn kt ni c mt ln. Cho nn, khi cc bn ni thm
mt chn linh kin khc vo gia 2 chn linh kin ni
to thnh mt nt c 3 ng ( hoc 4 ng ) th phi m
bo khong cch gia 2 chn linh kin ln, c th
thc hin vic kt ni.
Mi mt nt ch c th kt ni c ti a 4 ngdy.
Nu trong qu trnh kt ni m cc dy ni khng
c ngay thng th cc bn ch cn: dng chut nhp vo
ng dy ang ni (ng dy khng ngay thng) v gi
chut, ri sau ko chut iu chnh li sao cho thng
hng v th chut (nh hnh 1,2,3,4 bn di).
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1 2
34
Sau khi thc hin giai on ni dy, ta s c mt mch
in hon chnh nh sau:
Ngoi ra, cc bn cn c th chn mu sc cho
ng dy ni bng cch nh sau: chn ng dy cn i
mu sc v nhp p chut (nhp 2 ln lin tip) vo
ng dy. Lc ny, c mt ca s hin ra. Sau , cc
bn chn mu sc nh mun v nhp vo OK. Kt qu l
ng dy ni s hin ra ng mu m cc bn chn
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Khi tng gi tr ca t:
T nhng kt qu ghi nhn c nh trn, d dng
rt ra nhn xt: diode chnh lu chuyn ngun xoay chiu
thnh mt chiu; gi tr t5 in cng ln sng dng in
p ng ra cng phng. in p trung bnh trn ti c th
o c bng Voltmeter.T nhng kt qu ghi nhn c nh trn, d dng rt ranhn xt: diode chnh lu chuyn ngun xoay chiu thnhmt chiu; gi tr t in cng ln sng dng in p ngra cng phng. in p trung bnh trn ti c th o c
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1.Mc ch - yu cu:
- Cng c kin thc v mch khuch i, nm vng
nguyn l hot ng v cch thit k mch in theo s
l thuyt. Bit cch la chn linh kin t thanh cng
c v o c cc thng s k thut ca mch nh vo
cc thit b o.
- S dng tt cc cng c o kim.
2.Cc bc tin hnh :
Trc tin ta cn phi khi ng chng trnh EWBbng cch: chn lnh Start > Programs > Electronics
WorkBench > Electronics WorkBench. Lc ny trn
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Sau khi ly xong tt c cc linh kin th cc bn
tin hnh ti vic ly ngun cung cp cho mch hot
ng. Nhp chut vo biu tng ngun Source.
Khi ca s ngun Source hin ra, cc bn hy nhp
v gi chut vo biu tng ngun Battery v ko biu
tng vo mn hnh thit k v t ti v tr thch
hp, ri th chut ra. Sau cc bn cng nhp v gi
chut vo biu tng ngun in p xoay chiu (mangtn: AC Voltage Source) ri ko biu tng y vo
mn hnh thit k; t ti v tr thch hp v th chut
ra.
Cng chnh ca s Sources, cc bn ly lun ng
Groundnh sau: nhp v gi vo biu tng Mass. Sau
ko biu tng vo trong mn hnh thit k mch v
t ti v tr thch hp, ri th chut. Thc hin tng t
c 5 im Mass.
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Sau khi ly v sp xp linh kin nh trnh by bi
tp 1 th cc bn c s mch in hnh v nh sau :
- Bc 2 : Chn tr s v nhn cho linh kin .
Cch chn li tr s v nhn cho tng linh kin ca
mch in sao cho cc gi tr ph hp vi yu cu
ca mch cn thit k. Do , cch chn tr s v nhn
ny c trnh by trong cc bi tp trc, cho nn
ngi thc hin khng trnh by li. Bn cnh , s
trnh by cho cc bn cch g ch ting vit trong
Workbench v cch chn tr s in p cho n hin th, gip cho sng ht led trong n hin th.
Cch g ch ting vit trong Workbench :
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g ch ting vit trong Workbench th cc bn hy
lm nh sau: mch in, trn n hin th c ghi ch
Hin th, nhm ch thch cho ngi xem bit c trong
mch in linh kin l ci g. Cch thc hin nh sau:
Cc bn hy di chuyn con tr n biu tng c k hiu
chM v nhp chut (k hiu mang tn:
Miscelaneous).
Lc ny, ca s hin ra ngay pha di biu tng,
ch cn cc bn nhp v gi chut vo biu tng k
hiu chA nm bn trong ca s (k hiu mang tn :
Textbox), sau ko biu tng vo mn hnh thit k,
ri th chut.
K tip , cc bn nhn nt phi chut vo chA,
trong trnh n s xung hy chn lnh Component
Properties v kt qu l c mt ca s Textbox hin ra
nh sau :
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Lu : Mc d khi chn Set Font ri nhng ch ca
bn s hin ra di dng mt Font khc. Khi ny cc
bn vn c nhn OK thot ra khi hp Textbox, sau
nhp v gi chut vo biu tng ch A; ko ch
HIN TH ra; t vo mn hnh thit k; th chut. Kt
qu s c c ch vi Font VNI - Times.
Mun di chuyn cc ch th ging nh cch di
chuyn cc linh kin vy.
Cch chn tr s in p cho n hin th :
lm c iu ny th cc bn hy nhp p chut
vo ngay n hin th. Lc ny, s c mt ca s
Decoded Bargraph Display Properties.
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Cc bn hy lu n bin tn hiu ti ng ra cao
nht l bao nhiu t c chia cho 10.V ly gi tr
mt phn in vo cho mc mang tn: Lomest
segment turn-on voltage(VL). y chnh l mc in
p nh nht cho php mt n led trong n hin th
sng. Cn mc mang tn Highest segment turn-on
voltage(VH), chnh l mc in p cao nht cho 10
n led sng trong n hin th. Trong mch in ny,
bin tn hiu ra cao nht l khong 21 mV n 22mV. Do ,cc bn cn phi in vo mc VL: 2 mvv
mc VH: 21 mV, nhm mc ch cho 10 bng n
led ca n hin th u sng ht theo s bin thin ca
bin tn hiu ti ng ra.
Bc 3 : Ni mch theo s nguyn l
c th ni mch c d dng v nhanh chng th
cc bn hy tin hnh nh sau :
Cc bn t mi tn con tr ngay ti v tr chn linh
kin, sao cho chn linh kin c xut hin du chm
en. Lc ny, nhp v gi chut, sau cc bn kochut ti chn linh kin cn ni v cho ti chn linh
kin cng xut hin du chm en th cc bn th
chut, kt qu cc bn s c mt ng ni mch .
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Sng ng ra ca mch khuch i dng transistor c
dng nh sau:
4/ Bi tp cng c:
Thit k mch khuch i y-ko (push-pull) ch B v AB. Nhn xt v si dng sng in p v
nhy ca mch.
BI 3: MCH DAO NG (555)
Kho st mch dao ng s dng IC 555 c s
nguyn l nh sau:
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1.Mc ch - yu cu :
- Cng c kin thc v vi mch 555, mt vi mch lai(hybrid) rt ni ting v tnh ph dng ca n. Nm
vng nguyn l hot ng v cch thit k mch s
dng IC 555 . Bit cch la chn cc linh kin t thanh
cng c v o c cc thng s k thut ca mch nh
vo cc thit b o.
- S dng thng tho cc thit b o kim phn tng
t.
2.Cc bc ti n hnh :
thit k mch in trn, cc bn cn phi khi
ng chng trnh Electronics WorkBench bng cch
chn lnh Start > Programs > Electronics
WorkBench > Electronics WorkBench.
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Sau khi khi ng chng trnh EWB, mn hnh
EWB xut hin v chng ta s tin hnh v s mch
in ny theo cc bc nh sau :
-Bc 1 : Ly linh kin.
Cc bn hy dng chut
nhp vo th vin vi mch
lai m hp linh kin cha
IC 555. Trong hp linh kin
ny, nhn chut vo nt
555; ko n vo mn
hnh thit k v t ti v
tr thch hp.Sau nhn vo nt
Close (c hnh du X) bn
trn gc phi ca hp linh
kin ng hp linh kin
ny li. Tip theo bn hy
nhp chut vo hp linh kin
Basic m ca s Basic. Trong ca s Basic va m, bn hy chn nt c
biu tng in tr (Resistor)
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Do chng trnh mc nh i vi in tr l nm
ngang v vy, cn phi xoay cho in tr nm dc bng
cch nhp chut chn in tr cn xoay sao cho in tr
bin thnh mu , v sau nhp chut vo nt
Rotate (Phm tt Ctrl + R)trn thanh cng c (lnh ny
s xoay linh kin mt gc 900 theo chiu ngc chiu
kim ng h).
Sau khi nhp vo nt Rotate, in tr s xoay mt
gc 900 so vi lc u. Trong hp linh kin Basic cn
ang m, chn t in khng cc tnh (Capacitor),
nhn v ko n vo mn hnh thit k, t vo v tr
thch hp v th chut.
Cng nh i vi in tr, t in cng nm ngang
theo ch mc nh ca chng trnh v cc bn hy
dng lnh Rotate xoay t in ny theo chiu dc tng
t nh cch xoay in tr trnh by trn .
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V cng chnh trong ca s Basic, cc bn dng
chut nhp vo biu tng bin th (ly bin th khng
c im gia). Ri sau , ko biu tng vo trong
mn hnh thit k v t ti v tr thch hp v th chut
ra.
Sau , ng ca s ny li bng cch nhp vo nt
Closec hnh ch X gc trn bn phi ca ca sBasic.
ly ngun cung cp cho mch th cc bn hy
dng chut nhp vo biu tng ngun Sources.
Lc ny, ca sSourceshin ra .
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Khi ca s ngun hin ra, cc bn ch cn nhp v gi
chut vo biu tng ngun Battery. Sau , ko biu
tng ngun v t vo v tr m cc bn cn thit
k, ri th chut. Trong hp linh kin Sources cn m,
bn hy chn im ni t c biu tng ni t
(Ground) v ko n vo ca s thit k, t vo v tr
thch hp v th chut.
Bc 2 : Sp xp cc linh kin theo nh s nguyn
l.
Mun di chuyn linh kin th cc bn lm nh sau :
dng chut nhp v gi linh kin cn di chuyn. Sau
, ko chut ti mt v tr m mong mun, ri th
chut ra.
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Bc 3 : Chn tr s v nhn cho linh kin.
Trong bi tp ny, gi tr ca cc linh kin l: R1=
6,8K; R2=3,3K; C = 0,1uF; C2 = 0,01uF; R3 = 12K; V
= 5VDC. iu chnh gi tr cho cc linh kin, ta lnlt thc hin nh sau:
Nhp chut phi vo in tr R1, mt trnh n s s
xut hin, nhp chut vo lnh Component
Properties. Ca s Resistor Properties s xut hin,
trong bng Label hy nhp tn Rvo Label.
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Nhp chut vo nt OK khi nhp xong. Nhp chut
phi vo t in C, trong trnh n s xung hy nhp
chut chn lnh Component Propertiesnhp tng t
nh trn.
Nhp chut phi vo ngun Battery,trong trnh n
s xung hy chn lnhComponent Properties.
Sau khi chn lnhComponent Properties,trong ca
s ny, bn hy chn lnhValuev tin hnh thay i
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gi tr ca ngun bng cch nhp gi tr 5 (n v V)
trong Voltage(V). Sau hy nhn OK chp nhn
cc thng s va nhp vo.
Bc 4 : Ni mch theo s nguyn l.
Sau khi thc hin giai on ni dy, ta s c mt
mch in hon chnh nh sau:
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Ngoi ra, cc bn cn c th chn mu sc cho ng
dy ni bng cch nh sau: chn ng dy cn i
mu sc v nhp p chut (nhp 2 ln lin tip) vo
ng dy. Lc ny, c mt ca s hin ra. Sau , cc
bn chn mu sc nh mun v nhp vo OK. Kt qu
l ng dy ni s hin ra ng mu m cc bn
chn.
Bc 4 : Kho st mch chnh lu bn k.
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Sau khi cc bn kt ni mch hon chnh,
tin hnh vic kho st dng sng ca mch in th cc
bn cn phi ly cc thit b o kim v ni vo trong s
mch in nh sau
Trong qu trnh kho st mch, mun xem c dng
sng ch cn cc bn nhp p chut vo ngay ti thit
b o, lc ny thit b o s c phng to v c th
trong mch dao ng ny thit b o l dao ng k. Kt
qu s c c mt mn hnh dao ng k kch c ln
tin cho vic kho st dng sng. Mt khc mun
tng kch c ca mn hnh dao ng k ln hn na th
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cc bn nhp chut vo nt Expand, nt ny pha
trn ca mn hnh dao ng k. Mun thu nh li ging
nh hnh dng ban u, cc bn hy nhp chut vo nt
Reduce.
Sau khi tt c c chun b
hon chnh th cc bn bt u cho
mch hot ng. mch hot ng
c cc bn nhp nt Activate
simulation(nt ny nm bn gc phica mn hnh EWB).
Sau khi mch hot ng th cc bn tin hnh n
vic lu li s mch in, do lu c s
mch in ny th ta phi thc hin nh sau.
Cc bn c th lu li bng cch nhn chut vo nt
Save trn thanh cng c (xem trong phn thc hnh).
t tn cho mch in va thit k vo khung File
name, sau nhp vo nt Save, vy l mch in ca
bn c t tn l Rectifier.ewbv tn ny s nm
gc trn bn tri ca mn hnh thit k.
3. Kt lun :
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Sng ng ra ca mch chnh lu bn k c dng nh
sau :
d dng hn trong vic tnh ton v quan st,
click nt Expand phng to mn hnh dao ng k.
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in p trn t dao ng gia hai tr s Vcc/3 v
2Vcc/3.
4. Bi tp cng c :
Hy thit k mch dao ng a hi dng vi mch 555
c tn s sng dng ng ra khng i nhng iu khin
c t l gia Ton v Toff ( thi gian ng ra mc cao
v thi gian ng ra mc thp)
BI 4: THANH GHI DCH
M phng thanh ghi dch dng Flip-Flop D nh
hnh v sau:
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1. Mc ch-Yu cu:
- Lm quen dn vi vic v mch in cn m phng c
th nh cch ly cc linh kin t thanh cng c, cch ni
dy trong chng trnh Electronics WorkBench v tin
hnh m phng. T cng c kin thc v mch ghi
chuyn m phng theo IC 74164.
- S dng c cc th vin linh kin s v cc thit b
phn tch s.
2. Trnh t m phng:
Khi ng chng trnh Electronics WorkBench
bng cch chn lnh Start > Programs > Electronics
WorkBench > Electronics WorkBench. Ngay sau
mn hnh lm vic ca chng trnh xut hin vi mt
ca s thit k cn trng.
Tin hnh thit k mch in trn trong ca s thit
k theo cc bc nh sau :
BC 1: Ly linh kin ra mn hnh thit k.
Trc tin bn cn c 4 Flip - Flop D loi D Flip-Flop
with Ative Low Asynch Input chn trn thanh cng chp linh kin Digital. Nhp chut vo m hp linh
kin ny ra.
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Trong ca s Digital hy chn D Flip-Flop with
Ative Low Asynch Input.
Nhp chut ln linh kin ny sao cho ti con tr xut
hin biu tng ca linh kin th bn ko n vo trong
ca s thit k v th chut ra.
Sau bn lp li theo cch trn 3 ln na c
4 Flip - Flop D loi D Flip-Flop with Ative Low Asynch
Input.
Tip theo bn cn phi ly 4 bng n bng cch
a con tr chut chn hp linh kin Indicator trn
thanh cng c.
Nhp chut vo hp linh kin ny m ca sIndicator. Trong ca s va m, bn hy con tr chn
Red Probe c hnh biu tng ca bng n.
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trn thanh cng c bng cch a con tr t vo cc
hp linh kin v tn ca hp linh kin s xut hin ngay
di con tr.
Nhp vo hp linh kin
ny m ca s Basic.
Tm cng tc Switch trong ca s va m v ko n
vo trong mn hnh thit k, t vo v tr thch hp v
th chut.
Tip tc ly thm ba cng tc na theo cch tng
t.
Ly ngun v Mass ging nh cc bi tp trc.
Trong mn hnh thit k by gi c cc linh
kin cn thit cho mch in chng ta cn thit k.
BC 2: t tn v cc thuc tnh cho cc linh
kin.
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Bn chn linh kin t tn bng cch a con tr
chut n v nhp chut ln linh kin ny sao cho linh
kin chuyn thnh mu .
Sau chn nt lnh Component Properties trn
thanh cng c.
K n bn hy chn vo bng Label bng cch nhp
chut vo tn bng Label.
Trong bng Label bn s thy hai khung mu trng,
khung th nht dng t tn cho linh kin sinh vin
ang chn, hy a chut nhp vo khung ny sao cho
c mt thanh mu en nhp nhy trong khung, lc nybn hy nh vo : FF1.
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Sau khi nh tn cho linh kin xong, bn nhp vo
nt OK kt thc qu trnh t tn. Sau khi nhp nt
OK th Flip - Flop D th nht s c tn l FF1. Thc
hin tng t vi cc bng Models, Fault, Display (xem
hng dn cc Ph lc).
Tng t nh cc Flip - Flop D, hy nhp nt phi vo
cng NOT m ca s NOT Gate Properties t tn
cho cng NOT trong bng Label v trong bng Models
chn Default trong Library; chn ideal trong
Model. V kt thc bng cch nhp vo nt OK.
Tng t cch lm trn i vi 4 bng n: L1, L2,
L3, L4.
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i vi cc cng tc, hy m ca s Switch
Properties nh cch trn.
bng gi tr (Value) trong Key c chSpace do
chng trnh mc nh, y l phm dng iu khin
cng tc nn bn c th thay i bng cch a con tr
chut nhp vo trng ri nh chng ln gi tr c. V
d nh k tA, sau nhp chut vo bng Label t
tn cho cng tc. Trong bng Label, bn nh ch
Preset vo trng Label v nhp vo nt OK ktthc qu trnh t tn cho cng tc. Sau khi nhp nt
OK, cng tc c t tn s c tn l Preset v
phm iu khin l A (khi bn nhn phm A trn bn
phm, tip im ny s thay i trng thi).
K n bn t tn cho cng tc th hai l Clock v
phm iu khin l S, cng tc th ba l Clear v phm
iu khin l D. Sau kim tra nh cng tc Preset.
B ngun pin c mc nh l 12 V, bn c th
thay i gi tr ny bng cch m ca s Battery
Properties nh i vi cc linh kin trn c trnh
by.
Trong bng Value ( gi tr ) bn c th thay i gi
tr in p bng cch thay gi tr khc trong Voltage.
V d nh chn gi tr l 5.
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Bn cng c th thay i n v ca in p bngcch nhp chut vo mt trong hai nt mi tn ln hoc
xung chn n v ph hp cho mch in. Trong
ny c 4 mc n v : mV, mV, V v kV.
Trong mch in ny chng ta s chn ngun Pin l
5V. Sau khi chn xong, bn chn OK kt thc. Xem
trn mn hnh ngun c thay i gi tr l 5V.
BC 3: Tin hnh ni mch in.
Bt u t cc Flip - Flop D vi cc chn Preset ni
chung vi nhau bng cch a con tr chut n chn
Preset ca FF1 sao cho u con tr xut hin mt chm
en.
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Nhn chut v ko n chn
Preset ca FF2 sao cho ti
y cng xut hin mt chm
en v ng mch ni hai
chn li vi nhau.Th chut, chng
trnh s t ng ni
mch.
ng mch khng c thng do ta c th chnhsa li cho thng bng cch chuyn con tr ti nhp vo
im ni mu en, con tr s bin thnh hnh bn tay.
Gi chut v ko im ni ny ln pha trn v th
chut ra. ng mch s c sa li thng.
Trong qu trnh ni dy nu ni sai chn, v d nh
ni chn Q ca FF1 vi chn D ca FF2 m li ni sai
vi chn Ck ca FF2.
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Bn c th g ra bng cch sau : a chut nhp vo
ng mch ni sai, khi ng mch s c t m.
Sau nhp vo nt Delete trn bn phm, chng
trnh s hi bn l : Delete selected items? (Xo biu
tng chn?) v bn chn: Yes (ng ); hoc No
(khng ng ) chn li.
Nu chn Yes ng mch s b xo v bn tin hnh
ni li.
Ni cc chn Clear v Ck li vi nhau bng cc cch
ni dy nh trn.
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Ni ngun dng ca pin vi cc chn chung ca cc
cng tc v u cn li ca ngun ni vi Mass.
Ti y l hon tt bc ni mch. Bn c th lu libng cch chn File (Alt + F) trn thanh trnh n.
Trong trnh n File bn chn v nhp chut vo Save
A. Ca s Save Circuit File xut hin. Sau nhp vo
nt Save, vy l mch in ca bn c t tn l
mch 74164.ewb.
+ Bc 4 : Kim tra mch.
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kim tra mch c hot ng hay khng bn hy
nhp chut vo cng tc ngun pha bn phi trn
thanh cng c (Activate simulation). Mch in
c cp ngun, lc ny ng ra ln 1 lm n sng
(mu ), cn nu mc 0 n khng sng (gi nguyn
trng thi).
Bn hy bt cc cng tc theo bng sau v in vo
bng nhng trng thi ca cc bng n. Cng tc bt
ln l mc cao v bt xung l mc thp ( Mc cao = 1,mc thp = 0, xung Clock tc ng cnh ln ).
Preset Clear Clock L1 L2 L3 L40 0 ? 0 1 ? 1 0 ? 1 1 ?
1 1 ? 1 1 ? 1 1 ? 1 1 ? 1 1 ? 1 1 ? 1 1 ? 1 1 ? 1 1 ?
3. Kt lun:
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Vi mch in thanh ghi dch trn bn c th thit k
mt mch n qung co n gin c chng trnh thay
i c thng qua vic thay i cch phn hi t cc
ng ra v li ng vo. Cho mch hot ng hiu r
hn nguyn l hot ng ca IC 74164.
4. Bi tp cng c:
Hy thit k mch m nh phn khng ng b MOD
10, m ln, s dng FF D c xung clock tc ng theo
cnh ln.
BI 5: MCH M
M phng mch m nh hnh sau:
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1. Mc ch - Yu cu :
Lm quen vi vic s dng phm phi ca chut
lm tt trong EWB 5.12, c th trong bi dng gi
nhiu linh kin cng mt chng loi.
Cng c li nhng kin thc v IC m 7490 v IC
gii m 7447.
2. Cc bc tin hnh m phng mch in :
Khi ng chng trnh Electronics WorkBenchbng cch nhp chut vo nt Start > Programs >
Electronics WorkBench> Electronics WorkBench.
- Bc 1 : Ly linh kin vo mn hnh thit k .
Nhp chut vo hp linh kin Digital ICs m hp
linh kin ny.
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Lm theo cch ny ly thm 5 cng NOT vo mn
hnh thit k.
Tip theo ly 2 ngun +Vcc vo mn hnh thit k.
Trong ca s Sources, ly 2 ngun +Vcc, im nit Ground; ko n vo mn hnh thit k, t vo v
tr thch hp v th chut.
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Sau khi ly y cc linh kin vo mn hnh
thit k, mn hnh s c dng sau:
- Bc 2 : Tin hnh ni dy cc linh kin theo s
nguyn l trn.
- Bc 3 : Do tnh cht ca mch in, vic cn chnh
y ch yu cc thit b o kim. C th:
Gip vic quan st s chuyn trng thi trong mch m c d
dng, chnh my pht sng dng nh sau:
- Bc 4 : Ghi nhn kt qu.
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1. Mc ch -Yu cu :
- Cng c li kin thc v mch dao ng to xung
vung dng IC 555, Flip-Flop D v cc cng logic.
- Gii thiu v cc thit b phn tch mch logic.
- Thng tho cch ly linh kin trong EWB
5.12.
2. Cc bc tin hnh:
Khi ng chng trnh Electronics WorkBench
bng cch nhp chut vo nt Start > Programs >
Electronics WorkBench > Electronics WorkBench.
- Bc 1 : Ly linh kin.
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Cc bn s ly IC 555 bng cch chn hp linh kin
Mixed ICs trn thanh cng c. Nhp chut vo hp linh
kin ny v chn 555 Timer c biu tng IC 555.
Nhn chut v ko IC 555 vo mn hnh thit k, t
vo v tr thch hp trong mn hnh thit k v thchut.
Tip theo hy nhp chut vo hp linh kin Digital
m hp linh kin ny.
Trong hp linh kin ny,
nhn chut vo nt D Flip-
Flop with Ative Low
Asynch Inputs, ko n vo
mn hnh thit k, t vo
mn hnh thit k v thchut.
Trong hp linh kin ny, nhn chut vo nt 2-Input
AND Gate, ko n vo mn hnh thit k, t vo v tr
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thch hp v th chut. Hy ly 4 cng AND vo mn
hnh thit k.
Trong hp linh kin Digital cn ang m hy nhn
chut vo nt NOT Gate, ko vo mn hnh thit k, t
vo v tr thch hp v th chut.
Nhp chut vo hp linh kin Basic m hp linh
kin ny.
Trong hp linh kin ny, nhn chut vo nt
Resistor, ko n vo mn hnh thit k, t vo v tr
thch hp v th chut. Hy ko vo mn hnh 8 in
tr. Trong hp linh kin Basic cn ang m, chn t
in khng cc tnh (Capacitor), nhn v ko n vo
mn hnh thit k, t vo v tr thch hp v th chut,
cc bn s cn c 2 t in.
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Trn thanh cng c cc bn hy chn hp linh kin
Sources c biu tng ngun Pin v nhp chut vo n
m hp linh kin.
Trong hp linh kin Sources, cc bn hy nhn chut
vo biu tng ngun Pin (Battery) v ko n vo ca
s thit k t vo v tr thch hp v th chut.
Trong hp linh kin Sources cn m, bn hy chn
MASS c biu tng ni t (Ground) v ko n vo
ca s thit k, t vo v tr thch hp v th chut.
Cc bn s cn n hai Ground.
Nhp chut vo hp linh kin Indicators m hp
linh kin ny. k n nhn chut vo nt Red Probe,
ko n vo mn hnh thit k, t vo v tr thch hp v
th chut. Hy ly 6 bng n Red Probe.(Tt c cclinh kin th ng va nu hng dn cch ly cc
bi tp trc)
Xoay chn ca bng n li cho ph hp vi mch
in bng cch nhn chut vo mt v tr pha trn bn
tri ca bng n trn cng, ko n v tr pha di ca
bng n cui cng, mt hnh ch nht bao ly tt c
cc bng n xut hin, hy th chut chn tt c
cc bng n cng mt lc.
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Cc bng n c chn s c mu , nhp
chut ln nt Flip Horizontal xoay linh kin theo
chiu ngang i din.
Trong hp dng c, hy nhn chut vo nt Logic
Analyser v Oscilloscope, ko vo mn hnh thit k,
t vo v tr thch hp v th chut.
- Bc 2: t tn v thay i gi tr cho cc linh kin.
Mch dao ng s to ra thi gian xung dng l
t+=8s v thi gian xung m l t-=2s. T cng thc trn
ta chn t C1=470mF; R2=6K; R1=18K; C2 = 0.01mF.
Nhp chut phi vo in tr R1, mt trnh n s s
xung, nhp chut vo lnh Component Properties.
Ca s Resistor Properties s xut hin, trong bng
Value hy nhp s 18 vo Resistance v n v
chn K.Nhp chut vo nt OK khi nhp xong cc thng
s trn chp nhn.
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Sau khi in tr R1 c thay tr s mi l 18K.
Tng t nh in tr R1, hy thay tr s ca R2 = 6K.
Cc in tr cn li vn gi tr mc nh l 1K.
Nhp chut phi vo t in C1, trong trnh n s
xung hy nhp chut chn lnh Component
Properties.
Trong ca s Capacitor Properties nhp gi tr 470vo Capacitance v trong n v l mF.
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Nhp vo nt OK khi chp nhn cc thng s va
nhp.
Thc hin tng t i vi t C2 = 0.01mF
Nhp chut phi vo cng NOT m trnh n s.
Nhp chut chn lnh Component Properties (tng tnh trn).
Trong ca s NOT Gate Properties, chn loi cmos
trong Library v chn HC trong Model. iu ny c
ngha l IC thuc h Cmos v c tc cao H.
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Nhp chut vo bng Label m bng Label.
Trong bng Label nhp tn ca cng NOT vo
Label. Nhp chut vo nt OK chp nhn nhng
thng s nhp vo.
Hy lm tng t i vi Flip- Flop D. Trong bng
Label hy nhp tn FF v trong bng Model hy chn
loi cmos trong Library v chn HC trong Model.
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Hy lm tng t i vi Flip-
Flop D. Trong bng Label hy
nhp tn FF v trong bng
Model hy chn loi cmos trong
Library v chn HC trong
Model.Cc cng AND hy lm tng
t nh trn trong ca s 2-Input
AND Gate . t tn cho cc cng
AND theo th t t trn xung
cho tng cng AND l G1, G2,
G3, G4 trong bng Label; chn
cmos trong Library v chn
HC trong Model ca bng
Model trong ca s 2-InputAND Gate.
M ca s Red Probe Properties bng cch nhp
nt phi chut vo bng n u tin trn cng v chn
Component Properties trong trnh n s xung.
Trong ca s Red Probe Properties hy nhp tn ca
bng n ny l X1 (xanh th 1) trong bng Label.
Nhp chut vo bng Model, chn cmos trong
Library v HC trong Model.
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Nhp chut vo bng Choose Probe v chn loi n
hin th, trong bng ny c ba loi mu theo th t t
trn xung l mu: Red (); Green (xanh l); Blue
(xanh dng). i vi bng n ny th chn loi xanh
dng, hy nhp chut vo chBlue Probe sao cho
mt du chm xut hin trong trn bn cnh.
Sau khi chn xong cc thng s cn thit th nhp
chut vo nt OK. Vi cc bng n cn li hy lm
tng t v theo th t t trn xung.
Bngth
Bng
Label Bng Model
Bng
Choose
ProbeLabel Library Model
1 X1 Cmos HC Blue2 V1 Cmos HC Green3 1 Cmos HC Red4 X2 Cmos HC Blue5 V2 Cmos HC Green
6 2 Cmos HC Red
- Bc 3 : Ni dy
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Hy bt u t chn s
1 ca IC 555, chn ny c
k hiu l GND (Ground) v
vy y l chn ni t ca
IC, a con tr chut n
chn s 1 sao cho ti y
xut hin 1 chm en.Nhn v ko n v tr
ca im ni t sao cho ti
y cng xut hin 1 chm
en v ng dy ni hai
im hin ra.Khi thy chm en
im ni t xut hin th
hy th chut, hai im s
t ni vi nhau.K n l chn s 2
(TRI) ca IC, hy ni chn
s 2 vi t C1 bng cch
nhn chut vo chn s 2
sao cho ti y xut hin 1
chm en.
Sau khi ni dy, mch in IC 555 s c hnh nh
sau:
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Nhn chut vo chn s 3 ca IC 555 v ko im
ny n ng vo ca cng NOT.
V nh chut
Nhn chut vo chn Ck ca Flip-Flop D v ko imny n on dy va ni chn s 3 ca IC 555 vi ng
vo ca cng NOT v th chut.
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Nhp chut vo thanh tiu ca my o trn mnhnh hin th (thanh c ghi tn ca my o) di chuyn
mn hnh n v tr thch hp v th chut.
Tng t nh vy i vi my o dng sng
Oscilloscope. Sau khi di chuyn cc my o sao cho d
quan st mch in nht th mn hnh thit k c dngnh hnh trn.
Nhp chut vo nt Activate simulation trn thanh
cng c cp ngun cho mch hot ng (tng t cc
bi trc).
Cn c vo my phn tch Logic ta thy c dng
sng ti cc n c iu khin bi cc cng Logic v
qua mch in ta d dng tm c biu thc hm cho
mi n.
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Thi gian n xanh dng s bng 8s v n xanh lc
(i din cho n vng) s l 2s v thi gian cho n
s l tng thi gian sng ca hai n xanh dng v
xang lc bng 10s.
3. Kt lun :
Mch in hot ng da trn cc biu thc hm
ca cc cng AND v NOT, in p ng ra s cp cho cc
bng n sng.
Thi gian ca n xanh dng s bng thi gian ca
xung dng ca IC 555 ti ng ra.
Thi gian ca n xanh lc s bng thi gian ca
mc 0 ca IC 555 ti ng ra.
Da vo cng thc tnh thi gian ca xung dng vmc 0 ca IC 555 c th tng hoc gim thi gian sng
ca cc bng n.
4. Bi tp cng c:
Hy thit k mch n giao thng c th ng dng ra
thc t ti mt ng t giao l vi yu cu c th nh
sau:
- C th chn c 1 trong 4 ch lm vic sau:
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* ng quyn: Thi gian dnh cho tn hiu n xanh
v cho hai ng nh nhau.
* u tin 1: n A = 2/3 B (tnh v thi gian).
* u tin 2: n A = 1/2 B (tnh v thi gian).
* V khuya: t 21h n 6h sng hm sau, ch c n
vng nhp nhy.
- Thi gian tr cc n c th chnh trong mt khong
rng v trn (chnh nhng vn tun th theo t l iu
khin trn).
- Thit k thm 2 n dnh cho ngi i b: n ny ch
sng khi n l sng.
THC HNH NNG CAO
Bi 1: Mch iu khin rng xung Bi 2: Mch n Organ Bi 3: Mch n qung co Bi 4: Thanh ghi dch Bi 5: Mch m Bi 6: n giao thng
BI 1: MCH IU KHIN RNGXUNG
Thit k mch iu khin rng xung s dng trong iu khin
thyristor.
http://codientu.info/codientu/ki_thuat_cdt/dien_tu/phan_mem/workbench/nang_cao/01_01.htmhttp://codientu.info/codientu/ki_thuat_cdt/dien_tu/phan_mem/workbench/nang_cao/02_01.htmhttp://codientu.info/codientu/ki_thuat_cdt/dien_tu/phan_mem/workbench/nang_cao/03_01.htmhttp://codientu.info/codientu/ki_thuat_cdt/dien_tu/phan_mem/workbench/nang_cao/04_01.htmhttp://codientu.info/codientu/ki_thuat_cdt/dien_tu/phan_mem/workbench/nang_cao/05_01.htmhttp://codientu.info/codientu/ki_thuat_cdt/dien_tu/phan_mem/workbench/nang_cao/06_01.htmhttp://codientu.info/codientu/ki_thuat_cdt/dien_tu/phan_mem/workbench/nang_cao/01_01.htmhttp://codientu.info/codientu/ki_thuat_cdt/dien_tu/phan_mem/workbench/nang_cao/02_01.htmhttp://codientu.info/codientu/ki_thuat_cdt/dien_tu/phan_mem/workbench/nang_cao/03_01.htmhttp://codientu.info/codientu/ki_thuat_cdt/dien_tu/phan_mem/workbench/nang_cao/04_01.htmhttp://codientu.info/codientu/ki_thuat_cdt/dien_tu/phan_mem/workbench/nang_cao/05_01.htmhttp://codientu.info/codientu/ki_thuat_cdt/dien_tu/phan_mem/workbench/nang_cao/06_01.htm -
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1/ Bi gii:
Trong cc ng dng khng yu cu v tuyn tnh khi kch dn
thyristor, ngi ta thng ngh ngay n UJT, PUT hay hai transistor
tng ng... Nhng trong mt s ng dng c tnh t ng ho cao,
cc s trn thng khng tho mn. Lc ny c th c nhiu gii
php khc nhau v mt trong cc gii php l ng dng mch in
n gin sau.
Vi mch in trn, vic iu tit gc kch dn thyristor c iu
tit thng qua vic iu khin in p ng vo V- ca OP-AMPS 741.
Ng ra ca OP-AMPS ny c th thng qua mch m kch dn
thyristor.
Khi lp mch in trn, bn cn lu nguyn l lm vic ca cc
khi vic cn chnh c d dng.
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Khi bn tri ca s chnh l
khi to xung rng ca. Khi ny
gi chc nng ng b ho vic
kch dn thyristor. iu chnh gi
tr ca in tr v t trong mch
s thay i dc sn xung ln
v xung ca xung rng ca. in
p ngun xoay chiu ly ngay trn
li xoay chiu m bn lp
thyristor (c th trong mch li
in 50 Hz). Hai diode khng c
yu cu c bit.
Nu bn lp ng, kim tra sng
dng trn mch s c dng nh
hnh bn tri (ng mu lsng sine 12VAC/50Hz/0 , ng
b vi in p li v ng mu
xanh l sng rng ca m bn cn
to ra c tn s trng kht vi tn s
li.
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OP-AMPS y gi chc nng
so snh hai tn hiu in p ng
vo: mt ca sng rng ca; mtca in p iu khin DC
Tu vo mc in p DC iu khin, gc kch dn thyristor s thay
i theo. C th:
- Hnh a: ta chnh V- = 3VDC (thng qua vic cn chnh t s gia hai
in tr).- Hnh b: ta chnh V- = 6VDC.
Hnh a Hnh b
R rng vic dch mc ng mu (mc DC) lm thay i Ton
v Toff ca sng dng ng ra OP-AMPS. T s thay i gc kch
dn thyristor.
1/ Bi tp m rng: Hy lp thm Thyristor cng ph ti v kho st sng dng, kim tra
tuyn tnh gia in p iu khin t vo V- vi Vti.
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BI 2: MCH N ORGAN
Thit k mch m phng mt cy n organ s dng bn phm lm
phm nhn.
1/ Bi gii:
Phn mm EWB 5.12 cho php to mt cy n organ bng chnh
bn phm my tnh ca bn. Tu vo tn s m thanh m bn gn chomi phm nhn m khi bn nhn vo mch s cho php pht ra tng m
thanh vi m sc khc nhau tng ng vi phm s m bn nh
trc.
Gi s bn mun gn cho cc phm t s 1 n s 0, mi phm mt
tn s tng ng: 330Hz; 440Hz; 550Hz; 770Hz; 880Hz; 990Hz ...
Trc tin phi thit k mt mch dao ng tn s 330Hz v lu li
di tn Pulse-01. Sau dng lnh Subcircuit i mch dao ng ny
thnh mt mch tch hp ch a ra cc chn iu khin ri lu li di
tn khc, v d nh "Pulse".
Tun t dng lnh Copy v Paste sao chp v dn mch Pulse-01
c s thay i vi tham s ca t in v in tr mch dao ng
mt tn s ring bit nh nu trn v lu li vi cc tn khc nhau
v d nh pulse-02; pulse-03 .... C tip tc cho n mch th chn.
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M trang thit k mi v dng lnh Copy v Paste dn tt c cc
mch in ph t Pulse-01 n Pulse-09 vo ca s lm vic ny. Cng
trong trang ny, ly thm cc cng tc c nh thi (nh thi gian pht
ra mi khi nhn phm), bng cch click vo ca s cng c Basic, gi
Time-Delay Switch.
Sau gi tip b chung t hp cng c Indicators:
Sau khi ly chn b cng tc v chn b chung, ni mch chng
li vi nhau v hiu chnh thng s cho cc linh kin, ta c ca s thit
k nh sau:
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Ngoi ra, trong my pht t bn cng c th ghi vo ri ct dnh
hoc gi cc chng trnh c sn trong EWB 5.12. Mun vy ban hy
click vo Pattern.Mt hp thoi nh sau s hin ra:
Nu bn chn v click vo Shift right, mt mng d liu iu khin
cc n dch phi t ng np vo my pht t.
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Cc dp l tt, hi h, khi vui chi vi bn b i lc cc bn s dng
con xc xc (x ngu) trong cc tr chi nh c c nga, c t ph ...
u im ca b xc xc ny c l ai cng r, nhng nhc im xc
sut khng ng u gia 6 s v thi gian gia cc ln quay s qu
ln ca chng c th hon ton c khc phc nu nh bn s dng
b xc xc in t sau.
B xc xc s hin th ngay lp tc mt s mi ngay sau khi bn
nhn nt lc xc xc. Nt ny chnh l ntPause trn mn hnh ca
bn.
Trc tin, bn phi gi ra 7 bng n m phng mt b hin th t
s 1 n s 6 ging nh xc xc tht bng cch gi cc n t hp cng
c Indicators.
Sau xp chng theo dng
sau:
Gi my pht t
ni vi 7 bng nvo cc ng ra tn
hiu ca my pht
t (khng nht thit
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phi theo th t).
Sau np d liu vo my sao cho mi t trong my pht t khi
pht ra iu khin 7 bng trn hin th mt trong su s t 1 n 6 ca
ht xc xc nh hnh sau (chng trnh np cc bn t vit, nu khngvit c hy xem bi gii Phn Ph lc):
chy chng trnh, u tin bn chnh my pht t chy t a ch
t 0000H n 0005H v chn mode step (chy tng bc d dngkim tra cc sai st c kh nng xy ra). Sau khi khng cn sai st,
chn mode cycle tn s 1KHz. mt thi im bt k, s c mt
trong su s ca b hin th xut hin trn mn hnh. Do tc dch
chuyn tun t gia cc s hin th qu cao nn ta khng th nhn ra
c con s ang hin th. Nhng khi bn nhnPause, my pht t
ngng pht v dng mt s bt k. Do vy, con s m bn thy trnmn hnh mang tnh ngu nhin, xc sut ng 1/6. thun tin trong
vic s dng, bn c th phng to ht c giao din ca xc xc d
quan st.
Giao din ca ht xc xc
lc bn cha nhn nt Pause
trn EWB 5.12.
Mi khi bn tc ng vo nt Pause trn mn hnh EWB 5.12, giao
din ca ht xc xc s dng li mt s bt k trong su s trn,
nu nhp tip vo Pause giao din li tip tc lun chuyn gia cc
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s...C nh vy, bn s mt ht xc xc va to (bng c mn hnh my
tnh), va nhanh c s (ngay lp tc sau mi ln nhp chut), xc sut
chnh xc 1/6. Bn hy th xem... chc cuc chi vui v.
2/ Bi tp m rng:
Bn hy thit k "chic nn k diu" nh trn VTV3 th xem, khng
kh u!
BI 5: MCH BNH BU DN
Thit k mch biu quyt ly kin a s cho 5 thnh vin tham
gia.
1/ Bi gii:
y l mt bi ton dng thit k mch logic t hp, vi 5 bin ng
vo c t tn A, B, C, D, E v mt hm ng ra Y. Ng ra ny s ln
1 nu a s ng vo ln 1 hoc ngc li.
Vi dng mch ny, trc tin bn hy gi b chuyn i logic
(Logic Converter) t hp cng c Instruments.
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Chn 5 ng vo bt k trn b chuyn i logic (Logic Converter)
tng ng vi 5 bin ng vo A, B, C, D, E. Mn hnh s hin ra nh
sau:
Click chut vo trng thi ng ra Y u tin trong bng trng thi
trn.
Ri tun t in cho tt c cc trng thi hin hu trong mch.
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Sau click vo
Ta s thy hm logic ca mch in trn xut hin ca s mu
trng bn di b chuyn i logic. Nhng hm logic ny cha c
ti gin. hm c gn hn, tip tc click .
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Mch logic trn s gn hn nu v li bng PAL (Programmable
Array Logic).
1/ Bi tp m rng:
Hy thit k mt mch n cu thang iu khin t 4 v tr c lp
nhau.
BI 6: MCH CHUYN I ADC-DAC
Thnh lp mch chuyn i tng t - s ri s - tng t. T
tm hiu mi lin quan gia hai th gii s v tng t.
1/ Bi gii:
Th no l mt my tng m k thut s, trung thc ca n l
thuc vo cc yu t g? Bi tp ny s gip cc bn c iu kin hiu
hn v nhng vn trn.
-
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M chng trnh EWB 5.12 v thnh lp mch in sau (y l mt
v d c sn trong th mc COMPLEX cc bi v d mu)
Linh kin ch lc trong bi tp ny chnh l hai vi mch ADC v
DAC, chng c s chn nh sau:
Vi mch ADC c phn cc chuyn tn hiu tng t t u vo
Vin ( ly t ngun in p hnh sine sang tn hiu s 8 bit vi chn
nhn tn s ly mu SOC (Sampling Oscillation) ly t my pht xung.
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Ngun Vref c
cp bng ngun
15VDC.
Vi mch cho php
d liu xut ra lin
tc nh chn OE
(Outputs Enable).
n bo gn vo
chn EOC bo hiuhon tt mt chu
k ly mu.
ADC c ni thng vi DAC. kim chng vic xut tn hiu
trn ADC ngi ta lp vo mch hai LED 7 on c gii m sn
hin th ni dung ca d liu s xut ra trn ADC.
DAC nhn tn hiu t ADC xut tn hiu ra OP-AMPS v vi mch
thut ton ny m tn hiu ra my dao ng k.
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Sau khi lp xong mch in trn, cp ngun cho mch v quan sttrn dao ng k ta nhn thy:
- Khi chnh tn s ly mu (thay i tn s ca my pht sng) 1
KHz, sng dng in p ng ra (hin th trn dao ng k) nh sau:
Lu : ng l sng dng in p ng vo v ng xanh l
sng dng in p ng ra.
- Chnh tn s ly mu ln 3KHz, kt qu dng sng ng ra l:
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- Khi chnh xung ch cn 500Hz, sng dng in p ng ra s:
Nh vy, bn c nhn xt g khi gia tng tn s ly mu ca ADC?
Tn s ny cng cao cng tt c phi khng? v c s chn la. Nu
bn ngh khng ra mi xem gii p Phn Ph lc.
1/ Bi tp m rng:
Hy thit k mt mch pht sng sine, rng ca, vung ... c tn s
pht xung chnh c trong mt khong rng v trn.
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Gi : Bn c th dng My pht t phi hp vi DAC. Xem my
pht t nh mt EPROM: thay i ni dung trong my pht t thay
i dng sng.
BI 6: MCH CHUYN I ADC-DAC
Thnh lp mch chuyn i tng t - s ri s - tng t. T tm hiu mi lin quan gia hai th gii s v tng t.
1/ Bi gii:
Th no l mt my tng m k thut s, trung thc ca n l
thuc vo cc yu t g? Bi tp ny s gip cc bn c iu kin hiu
hn v nhng vn trn.
M chng trnh EWB 5.12 v thnh lp mch in sau (y l mt
v d c sn trong th mc COMPLEX cc bi v d mu)
-
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113/117
-
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114/117
Ngun Vref c
cp bng ngun
15VDC.
Vi mch cho php
d liu xut ra lin
tc nh chn OE
(Outputs Enable).
n bo gn vo
chn EOC bo hiuhon tt mt chu
k ly mu.
ADC c ni thng vi DAC. kim chng vic xut tn hiu
trn ADC ngi ta lp vo mch hai LED 7 on c gii m sn
hin th ni dung ca d liu s xut ra trn ADC.
DAC nhn tn hiu t ADC xut tn hiu ra OP-AMPS v vi mch
thut ton ny m tn hiu ra my dao ng k.
-
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Sau khi lp xong mch in trn, cp ngun cho mch v quan sttrn dao ng k ta nhn thy:
- Khi chnh tn s ly mu (thay i tn s ca my pht sng) 1
KHz, sng dng in p ng ra (hin th trn dao ng k) nh sau:
Lu : ng l sng dng in p ng vo v ng xanh l
sng dng in p ng ra.
- Chnh tn s ly mu ln 3KHz, kt qu dng sng ng ra l:
-
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117/117
Gi : Bn c th dng My pht t phi hp vi DAC. Xem my
pht t nh mt EPROM: thay i ni dung trong my pht t thay
i dng sng.
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