TÔ PHẠM HÀ TRIỀU LÊ NGUYÊN TRƯỜNG SƠN NGUYỄN NGỌC SƠN

T PHM H TRIUL NGUYN TRNG SNNGUYN NGC SN

OP-AMP TL072CN

S chn

Transistor tng li sc2383

Transistor tng khuch i cng sutD468 npn

B562-pnp

Diode FR207

Rl=15 ohmVcc=12v

Chn re=1 ohm

S tng ng ac bn k dng

S tng ng ac bn k m

Dng ic 2 bn k i xng

Xt Q1B qua ib2,ib3Rdc= R3Rac=R3//(hie2+Rl'hfe2) b qua RdPhng trnh ng ti 12-1.3=Rdc. ICQ1 +VCEQ1

ICQTUDng Id=ICQ1, diode dn ta chn dng id=0.02AR3=278 ohm

p hi tip trn ng ra tng cng sut l 6 V,p ti ng vao V- ca opam l ta s chn RK,Rf sao cho V+-V->0.24 th p ra OPAMP s l 6V

vi=1V ,ta chn R1=R2 sao cho R1//R2>>richn R1=R2=50k =>viV+V+v+ = v- = vi

chn Rk=10k =>Rf=44k

cc t bypasss c chn sao cho trong khong m tng th b bypass, chon Ci=Ck=470u

Chn tng s ct thp l 20 hz => CL=470u

VLm

P NG RA Q1

P NG RA OPAMP

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