B cng thng Trng i hc kinh t k thut cng nghip

B cng thngTrng i hc kinh t k thut cng nghip

Bi GingThc Hnh Audio-VideoBI 1MCH CNG SUT DNG OP-AMP

1. S KHI AMPLIFIER:

BI 1MCH CNG SUT DNG OP-AMP2. CHC NNG V NHIM V CA CC KHI:a. Mch K Micro:b. Mch K Aux: c. Mch Mixer:d. Mch m sc:e. Mch khuch i thc:f. Balance:g. KCS: h. Mch bo v:i. Loa :j. Ngun cung cp:BI 1MCH CNG SUT DNG OP-AMP3. NGUYN L HOT NG THEO S KHI:

a. Tn hiu t micro hay t cc ngun tn hiu ph khc a ti 2 ng vo Mic v Aux c bin kh nh c mch khuch i micro v aux khuch i cho bin ln ln sau a n mch trn tn hiu, sau khi qua mch trn bin tn hiu a n mch m sc l tng ng nh nhau v ti y tn hiu s c iu chnh c c m trm hay m bng p ng nhu cu s dng. Sau tn hiu tip tc c a sang mch khuch i cng sut khuch i cho tn hiu ln ln nghe c trn loa.

BI 1MCH CNG SUT DNG OP-AMP3. NGUYN L HOT NG THEO S KHI:b. Ni ngun th chun +12V v mass (GND) t b ngun c to sn cp cho khi KCS.c. Ni ngun in p c n p ti khi KCS cung cp cho cc khi khc.

BI 1MCH CNG SUT DNG OP-AMP4. MCH KHUCH I CNG SUT DNG OP-AMP:

Bi 2MCH K CNG SUT OTL1.S NGUYN L MCH OTL:

Bi 2MCH K CNG SUT OTL2. NHIM V LINH KIN TRONH MCH:Q1: tin khuch i; Q2: Driver; Q3,Q4: Transistor cng sut (cp transistor b ph); Q3, Q5 v Q4, Q6: ghp Darlington ( tng h s khuch i)

Volume 50K: iu chnh m lng (bin ) tn hiu ng vo; VR1 100K: dng chnh ly mc p trung im; VR2 500: chnh in p phn cc cho Transistor cng sut (dng chnh mc mo ti giao im tn hiu)

C1, C3: dng lin laic; R8, R10, C7: dng lm mch hi tip dng (Boost-trap); C2, C6: to hi tip nghch AC, chng mch pht sinh dao ng t kch (t trung ha); C4, C8: t thot AC, gia tng li tng khch i; C9, R17: mch lc Zobel, dng chng dao ng t kch (loi b tn hiu vng tn s cao) v cn bng tr khng vi loa. Trnh c hin tng mo do tr khng khng cn bng vi loa; C10: tu xut m.

li ton mch c th tnh theo h thc sau: K(ton phn) =R6/R5

Bi 3MCH K CNG SUT OCL1. S NGUYN L MCH OCL

Hnh 3-2a: Mch KDCS OCL 1Bi 3MCH K CNG SUT OCL1. S NGUYN L MCH OCL

Hnh 3-2b: Mch KDCS OCL 2Bi 4MCH KCS BTL MCH BO V LOA1. MCH BTL

Bi 4MCH KCS BTL MCH BO V LOA1. MCH BTLMch KCS BTL l dng mch K cu i xng, l 2 na mch cu lm vic song song nhau nhng vi 2 tn hiu ti 2 ng vo nghch pha nhauL dng mch cho ra cng sut ln vi in p ngun nui thpLoa c ko trc tip nn chng c mo bin v mo tn sHiu sut cao, khng kn ti loa

Bi 4MCH KCS BTL MCH BO V LOA2. MCH O PHA:

Bi 4MCH KCS BTL MCH BO V LOA3. MCH BO V LOAMch bo v ny c tc dng lm tr 5 n 10 giy, khi mi m my khng ni loa vo mch. Nn trnh c ting n loa khi mi m my, v lc in p im gia khc 0v do cp transistor b ph khng i xng hon ton, gy ra ting n loa lm kh chu cho ngi nghe v nh hng xu n loaNgoi ra cn c tc dng bo v loa khi c s c chm mch c th dn n lm chy loa.

Bi 4MCH KCS BTL MCH BO V LOA3. MCH BO V LOA

Bi 5MCH TIN K V LC M SC1. MCH TIN KHUCH I

Bi 5MCH TIN K V LC M SC2. MCH LC M SC (EQUALIZER):

Bi 5MCH TIN K V LC M SC3. MCH LC M SC

BI 6KHI NGUN TV MU1. S khi khi ngun :

BI 6KHI NGUN TV MU2. Nhim v tng khi :2.1 Lc nhiu ng dy.

Hinh 6.2: Mch lc nhiu ACBI 6KHI NGUN TV MU2.2 Khi kh t.2.2.1. Kh t RT c 2 chn :

Hinh 6.3:Kh t dng RT c 2 chnBI 6KHI NGUN TV MU2.2.2 Kh t RT c 3 chn :

Hinh 6.4:Kh t dng RT c 3 chnBI 6KHI NGUN TV MU 2.3. Khi chnh lu AC DC :

Hinh 6.5:Chnh lu dng cu DiodeBI 6KHI NGUN TV MU2.3.1 Khi chnh lu AC DC c nhn i in p dng 2 D :

Hinh 6.6:Chnh lu nhn i in pBI 6KHI NGUN TV MU2.3.2. Khi chnh lu AC DC c nhn i in p dng 1cu D :

Hinh 6.7:Chnh lu nhn i in p dng cu DiodeBI 6KHI NGUN TV MU2.3.3. Khi chnh lu AC DC c nhn i in p dng 2 cu D :

Hinh 6.8: Chnh lu nhn i in p dng 2 cu DiodeBI 6KHI NGUN TV MU3. MT S H HNG TRN KHI NGUN :Mch ngun hon ton khng hot ngHot ng ngun in 220V tt,khng hot ng ngun 110VHot ng 110V hay cht Transistor C/S ngun :Ngun ra thp hn bnh thng :M ngun bng vi x l khng c :BI 7KHI VI X L CA TI-VI MUS KHI HOT NG IC VI X L:

BI 7KHI VI X L CA TI-VI MUNHIM V CC CHN VI X L :-Chn (1) l chn cp in p cho dy tn UHF .-Chn (35) BAND2 (VL): ng ra iu khin chn bng tn VHFl.-Chn (36) BAND1 (VH) :ng ra iu khin chn bng tn VHFH.

BI 7KHI VI X L CA TI-VI MUNHIM V CC CHN VI X L :-Chn (10)AFT : ng vo tn hiu t dng d.-Chn (11)AC DET-Chn (13) RESET : ng vo tn hiu RESET n t mch to tn hiu RESET nh cc thnh phn linh kin : transistor V702 v diode VD703Chn (15) POWER ON/OFF : lnh m ngun t chn (15)N701. Khi hot ng ch POWER ON chn ny mc thp, s mch m ngun bng vi x l c trnh by bi 6- Chn (17) V-SYNC : ng vo xung qut dc (qut mnh) t chn (7)N841 n .Chn (18) H-SYNC : ng vo xung qut ngang (qut dng) t FBT n.-Chn (19) R: Ng ra tn hiu hin th mu .-Chn (20) G: Ng ra tn hiu hin th mu xanh l .-Chn (21) B: Ng ra tn hiu hin th mu xanh dng .

BI 7KHI VI X L CA TI-VI MU-Chn (22) BLK : OSD Blanking output to in p xa du dnh cho chc nng hin th mn hnh .-Chn (27) SD : Sync Det : Nhn din tn hiu ng b phc v cho chc nng AFT, to mn hnh xanh-Chn (28) IR ( Remote Control Input ) : Ng vo tn hiu hng ngoi.-Chn (29) VOL-R : Ng ra in p iu khin m lng knh R.Chn (30) VOL-L : Ng ra in p iu khin m lng knh L.-Chn (31) WOOFER :Ng ra iu khin loa WOOFER.-Chn (32) VT : Ng ra in p iu khin d i.-Chn (33) AV2 : Ng ra tn hiu chn ng vo AV2.-Chn (34) AV1 : Ng ra tn hiu chn ng vo AV1.- Chn (35) : l chn cp in p cho dy tn VHF.- Chn (36) : l chn cp in p cho dy tn VHFL