amplificator de casti
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UPB – Facultatea TRANSPORTURI
Amplificator audio cu 3 tranzistoareUDREA BOGDAN MARIANGrupa : 8314
PROIECTARE ASISTATA DE CALCULATOR
CUPRINS:
Schema electrica…………………………………..3
Descriere………………………………………………4
Descrierea componentelor……………………5
Diodele 1N4148………………………………………………………………….5
Tranzistorul BD135…………………………………………….……………….6
Tranzistorul 2N2905A………………………………………………………...7
Tranzistorul 2N3904…………………………………………………………….8
Rezistoarele R1, R2………………………………………………………………9
Condensatoarele C1,C2……………………………………………………….9
Cablaj…………………………………………………..10
Fisierul .CIR…………………….………………….…11
Fisierul .OUT………………..…………………….…16
Grafice………………………………………………….29
Simulare in MultiSim…………………………….33
2
Schema electrica :
3
Descriere
Amplificatorul prezentat se bazeaza pe trei tranzistoare (doua NPN si unul PNP). Acesta poate reda o putere de 100mW unui difuzor de maxim 25 ohmi.Diodele D1 si D2 asigura o tensiune de polarizare constanta pentru tranzistoarele Q1 si Q2.Tranzistorul Q1 are rol de preamplificator.Tranzistorii Q2 si Q3 conduc curentul in difuzor.Tipul tranzistoarelor nu este crucial in realizarea acestui circuit, astfel pentru Q1 si Q3 se poate folosi orice tranzistor de tip NPN, iar pentru Q2 orice tranzistor de tip PNP.Curentul minim in colector nu trebuie sa fie mai mic de 100mA.Circuitul functioneaza bine si cu un difuzor de 8 ohmi, dar volumul va fi mai mic.
Amplificatorul poate fi folosit ca unul pentru casti. Acesta se situeaza intre clasele A si B ale amplificatoarelor comerciale.
4
Descrierea componentelor
Diodele 1N4148 :
Sunt diode de mare viteza fabricate in tehnologie planara si inchise ermetic in sticla SOD27.
Caracteristici:
Viteza mare de schimb : max. 4 ns Tensiune reversibila continua : max 100 V Tensiune repetitiva de varf: max 100 V Curent repetitiv de varf : max 450 mA
Diodele D1 si D2 (1N4148) asigura o tensiune de polarizare constanta pentru tranzistoarele Q1 (BD135) si Q2 (2N2905A).
5
Tranzistorul Q1 – BD135
BD135 este un tranzistor de tip NPN asezat in carcasa de plastic SOT-32.Acesta este destinat pentru utilizarea in producerea de amplificatoare audio si circuite complementare.
Caracteristici:
Tensiunea colector-baza : 45 V Tensiunea colector-emitor : 45 V Tensiunea emitor-baza : 5 V Curentul de scurtatura in colector: max 0.1 uA Curentul de scurtatura in emitor: max 10 uA Tensiunea de saturatie colector-emitor: mx 0.5 V
Tranzistorul Q1 (BD135) are rol de preamplificator pentru circuitul prezentat.
6
Tranzistorul Q2 – 2N2905A
2N2905A este un tranzistor PNP din silicon in carcasa de metal Jedec TO-39.Este destinat pentru comutare la viteza foarte mare si uz general.
Caracteristici:
Tensiunea colector-baza: - 60 V Tensiunea colector-emitor: -60 V Tensiunea emitor-baza: -5 V Curentul in colector: -0.6 A Curentul de scurtatura in colector: max -10 uA Curentul de scurtatura in baza : -50 nA Tensiunea de cadere colector-baza/colector-emitor: min -60 V
Alaturi de Q3 (2N3904) are rolul de a conduce curentul in circuit.
7
Tranzistorul Q3- 2N3904
2N3904 este un tranzistor de tip NPN avand ca scop general folosirea in amplificatoare dar si comutarea.Gama dinamica poate fi extinsa pana la 100mA ca si comutator si 100MHz ca si amplificator.
Caracteristici:
Tensiunea in colector-emitor: 40 V Tensiunea in colector-baza: 60 V Tensiunea emitor-baza: 6 V Tensiunea de cadere colector-emitor: 40 V Tensiunea de cadere colector-baza: 60 V Curentul de scurtatura in baza/colector : min 50nA
Alaturi de Q2 (2N2905A) are rolul de a conduce curentul in circuit.
8
Rezistorul R1 (100kOhm)
Functia rezistorului R1 este de a capta jumatate din tensiunea de alimentare la legatura intre Q1 si emitorul Q2. R1 este rezistenta de interferenta pentru Q3 si stabilizatorul de tensiune la emitorii lui Q1 si Q2.
Rezistorul R2 (1 kOhm)
Functia rezistorului R2 este aceea de a capta o parte din tensiunea care merge spre tranzistorul Q1.
Condensatoarele C1(47 uF ) si C2(470 uF)
Pentru ca circuitul sa functioneze acestea trebuie incarcate initial cu cel putin 15V.
9
Cablajul imprimat
10
Fisierul .CIR
** amplificator audio cu 3 tranzistoare **
* NI Multisim to SPICE Netlist Export
* Generated by: Bogdan
* Sun, Dec 02, 2012 20:44:09
*## Multisim Component D2 ##*
dD2 5 1 D1N4148__DIODE__1
*## Multisim Component D1 ##*
dD1 6 5 D1N4148__DIODE__1
*## Multisim Component V2 ##*
vV2 4 0 ac 20mv 0
*+ distof1 0 0
*+ distof2 0 0
+ sin(0 20mv 1000 )
11
*## Multisim Component Q1 ##*
qQ1 8 6 10 QBD135__BJT_NPN__1
*## Multisim Component R3 ##*
rR3 8 3 8
*.model vresR3 r( )
*## Multisim Component V1 ##*
vV1 8 0 dc 9
*+ distof1 0 0
*+ distof2 0 0
*## Multisim Component C2 ##*
cC2 3 10 0.00047
*## Multisim Component R2 ##*
rR2 3 6 1000
*.model vresR2 r( )
*## Multisim Component C1 ##*
cC1 2 4 4.7e-005
12
*## Multisim Component R1 ##*
rR1 10 2 100000
*.model vresR1 r( )
*## Multisim Component Q3 ##*
qQ3 1 2 0 Q2N3904__BJT_NPN__1
*## Multisim Component Q2 ##*
qQ2 0 1 10 Q2N2905A__BJT_PNP__1
.MODEL D1N4148__DIODE__1 D(Is=0.1p Rs=1.6 CJO=2p Tt=12n Bv=100 Ibv=0.1p)
.MODEL QBD135__BJT_NPN__1 NPN(
+ IS = 4.815E-14
+ NF = 0.9897
+ ISE = 1.389E-14
+ NE = 1.6
+ BF = 124.2
+ IKF = 1.6
+ VAF = 222
+ NR = 0.9895
+ ISC = 1.295E-13
+ NC = 1.183
+ BR = 13.26
+ IKR = 0.29
13
+ VAR = 81.4
+ RB = 0.5
+ IRB = 1E-06
+ RBM = 0.5
+ RE = 0.165
+ RC = 0.096
+ XTB = 0
+ EG = 1.11
+ XTI = 3
+ CJE = 1.243E-10
+ VJE = 0.7313
+ MJE = 0.3476
+ TF = 6.478E-10
+ XTF = 29
+ VTF = 2.648
+ ITF = 3.35
+ PTF = 0
+ CJC = 3.04E-11
+ VJC = 0.5642
+ MJC = 0.4371
+ TR = 1E-32
+ CJS = 0
14
+ VJS = 0.75
+ MJS = 0.333
+ FC = 0.9359 )
.MODEL Q2N3904__BJT_NPN__1 NPN(Is=6.734f Xti=3 Eg=1.11 Vaf=74.03 Bf=416.4 Ne=1.259
+ Ise=6.734f Ikf=66.78m Xtb=1.5 Br=.7371 Nc=2 Isc=0 Ikr=0 Rc=1
+ Cjc=3.638p Mjc=.3085 Vjc=.75 Fc=.5 Cje=4.493p Mje=.2593 Vje=.75
+ Tr=239.5n Tf=301.2p Itf=.4 Vtf=4 Xtf=2 Rb=10)
.MODEL Q2N2905A__BJT_PNP__1 pnp
+IS=2.16812e-14 BF=731.358 NF=0.994204 VAF=10
+IKF=0.215906 ISE=1.62895e-14 NE=1.22488 BR=0.1
+NR=1.08444 VAR=1.26678 IKR=0.10075 ISC=1.62895e-14
+NC=1.88495 RB=19.1116 IRB=0.1 RBM=0.1
+RE=0.217003 RC=1.08502 XTB=1.43136 XTI=1
+EG=1.206 CJE=2.81158e-11 VJE=0.672107 MJE=0.365634
+TF=5.18555e-10 XTF=1.5 VTF=0.999999 ITF=1
+CJC=1.98207e-11 VJC=0.4 MJC=0.393384 XCJC=0.8
+FC=0.676284 CJS=0 VJS=0.75 MJS=0.5
+TR=1.20243e-06 PTF=0 KF=0 AF=1
.ac dec 10 1 100meg
.tran 1us 10ms
15
.probe
.end
Fisierul .OUT
**** 12/19/12 17:47:10 *********** Evaluation PSpice (Nov 1999) **************
** amplificator audio cu 3 tranzistoare **
CIRCUIT DESCRIPTION
*******************************************************************
*
* NI Multisim to SPICE Netlist Export
* Generated by: Bogdan
* Sun, Dec 02, 2012 20:44:09
*
*## Multisim Component D2 ##*
dD2 5 1 D1N4148__DIODE__1
*## Multisim Component D1 ##*
dD1 6 5 D1N4148__DIODE__1
*## Multisim Component V2 ##*
vV2 4 0 ac 20mv 0
*+ distof1 0 0
*+ distof2 0 0
16
+ sin(0 20mv 1000 )
*## Multisim Component Q1 ##*
qQ1 8 6 10 QBD135__BJT_NPN__1
*## Multisim Component R3 ##*
rR3 8 3 8
*.model vresR3 r( )
*## Multisim Component V1 ##*
vV1 8 0 dc 9
*+ distof1 0 0
*+ distof2 0 0
*## Multisim Component C2 ##*
cC2 3 10 0.00047
*## Multisim Component R2 ##*
rR2 3 6 1000
*.model vresR2 r( )
*## Multisim Component C1 ##*
cC1 2 4 4.7e-005
*## Multisim Component R1 ##*
rR1 10 2 100000
*.model vresR1 r( )
*## Multisim Component Q3 ##*
17
qQ3 1 2 0 Q2N3904__BJT_NPN__1
*## Multisim Component Q2 ##*
qQ2 0 1 10 Q2N2905A__BJT_PNP__1
.MODEL D1N4148__DIODE__1 D(Is=0.1p Rs=1.6 CJO=2p Tt=12n Bv=100 Ibv=0.1p)
.MODEL QBD135__BJT_NPN__1 NPN(
+ IS = 4.815E-14
+ NF = 0.9897
+ ISE = 1.389E-14
+ NE = 1.6
+ BF = 124.2
+ IKF = 1.6
+ VAF = 222
+ NR = 0.9895
+ ISC = 1.295E-13
+ NC = 1.183
+ BR = 13.26
+ IKR = 0.29
+ VAR = 81.4
+ RB = 0.5
+ IRB = 1E-06
18
+ RBM = 0.5
+ RE = 0.165
+ RC = 0.096
+ XTB = 0
+ EG = 1.11
+ XTI = 3
+ CJE = 1.243E-10
+ VJE = 0.7313
+ MJE = 0.3476
+ TF = 6.478E-10
+ XTF = 29
+ VTF = 2.648
+ ITF = 3.35
+ PTF = 0
+ CJC = 3.04E-11
+ VJC = 0.5642
+ MJC = 0.4371
+ TR = 1E-32
+ CJS = 0
+ VJS = 0.75
+ MJS = 0.333
+ FC = 0.9359 )
19
.MODEL Q2N3904__BJT_NPN__1 NPN(Is=6.734f Xti=3 Eg=1.11 Vaf=74.03 Bf=416.4 Ne=1.259
+ Ise=6.734f Ikf=66.78m Xtb=1.5 Br=.7371 Nc=2 Isc=0 Ikr=0 Rc=1
+ Cjc=3.638p Mjc=.3085 Vjc=.75 Fc=.5 Cje=4.493p Mje=.2593 Vje=.75
+ Tr=239.5n Tf=301.2p Itf=.4 Vtf=4 Xtf=2 Rb=10)
.MODEL Q2N2905A__BJT_PNP__1 pnp
+IS=2.16812e-14 BF=731.358 NF=0.994204 VAF=10
+IKF=0.215906 ISE=1.62895e-14 NE=1.22488 BR=0.1
+NR=1.08444 VAR=1.26678 IKR=0.10075 ISC=1.62895e-14
+NC=1.88495 RB=19.1116 IRB=0.1 RBM=0.1
+RE=0.217003 RC=1.08502 XTB=1.43136 XTI=1
+EG=1.206 CJE=2.81158e-11 VJE=0.672107 MJE=0.365634
+TF=5.18555e-10 XTF=1.5 VTF=0.999999 ITF=1
+CJC=1.98207e-11 VJC=0.4 MJC=0.393384 XCJC=0.8
+FC=0.676284 CJS=0 VJS=0.75 MJS=0.5
+TR=1.20243e-06 PTF=0 KF=0 AF=1
.ac dec 10 1 100meg
.tran 1us 10ms
.probe
.end
20
**** 12/19/12 17:47:10 *********** Evaluation PSpice (Nov 1999) **************
** amplificator audio cu 3 tranzistoare **
Diode MODEL PARAMETERS
*******************************************************************
D1N4148__DIODE__1
IS 100.000000E-15
BV 100
IBV 100.000000E-15
RS 1.6
TT 12.000000E-09
CJO 2.000000E-12
**** 12/19/12 17:47:10 *********** Evaluation PSpice (Nov 1999) **************
** amplificator audio cu 3 tranzistoare **
BJT MODEL PARAMETERS
*******************************************************************
QBD135__BJT_NPN__1
NPN
IS 48.150000E-15
BF 124.2
21
NF .9897
VAF 222
IKF 1.6
ISE 13.890000E-15
NE 1.6
BR 13.26
NR .9895
VAR 81.4
IKR .29
ISC 129.500000E-15
NC 1.183
RB .5
RBM .5
IRB 1.000000E-06
RE .165
RC .096
CJE 124.300000E-12
VJE .7313
MJE .3476
CJC 30.400000E-12
VJC .5642
MJC .4371
22
MJS .333
FC .9359
TF 647.800000E-12
XTF 29
VTF 2.648
ITF 3.35
TR 0
CN 2.42
D .87
Q2N3904__BJT_NPN__1
NPN
IS 6.734000E-15
BF 416.4
NF 1
VAF 74.03
IKF .06678
ISE 6.734000E-15
NE 1.259
BR .7371
NR 1
RB 10
RC 1
23
CJE 4.493000E-12
MJE .2593
CJC 3.638000E-12
MJC .3085
TF 301.200000E-12
XTF 2
VTF 4
ITF .4
TR 239.500000E-09
XTB 1.5
CN 2.42
D .87
Q2N2905A__BJT_PNP__1
PNP
IS 21.681200E-15
EG 1.206
BF 731.358
NF .994204
VAF 10
IKF .215906
ISE 16.289500E-15
NE 1.22488
24
BR .1
NR 1.08444
VAR 1.26678
IKR .10075
ISC 16.289500E-15
NC 1.88495
RB 19.1116
RBM .1
IRB .1
RE .217003
RC 1.08502
CJE 28.115800E-12
VJE .672107
MJE .365634
CJC 19.820700E-12
VJC .4
MJC .393384
XCJC .8
MJS .5
FC .676284
TF 518.555000E-12
XTF 1.5
25
VTF .999999
ITF 1
TR 1.202430E-06
XTB 1.43136
XTI 1
CN 2.2
D .52
**** 12/19/12 17:47:10 *********** Evaluation PSpice (Nov 1999)
** amplificator audio cu 3 tranzistoare **
**** SMALL SIGNAL BIAS SOLUTION TEMPERATURE = 27.000 DEG C
*******************************************************************
NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE
( 1) 2.9851 ( 2) .7065 ( 3) 8.9625 ( 4) 0.0000
( 5) 3.6281 ( 6) 4.2710 ( 8) 9.0000 ( 10) 3.6433
26
VOLTAGE SOURCE CURRENTS
NAME CURRENT
vV2 0.000E+00
vV1 -6.832E-03
TOTAL POWER DISSIPATION 6.15E-02 WATTS
**** 12/19/12 17:47:10 *********** Evaluation PSpice (Nov 1999) **************
** amplificator audio cu 3 tranzistoare **
**** INITIAL TRANSIENT SOLUTION TEMPERATURE = 27.000 DEG C
*******************************************************************
NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE
( 1) 2.9851 ( 2) .7065 ( 3) 8.9625 ( 4) 0.0000
( 5) 3.6281 ( 6) 4.2710 ( 8) 9.0000 ( 10) 3.6433
27
VOLTAGE SOURCE CURRENTS
NAME CURRENT
vV2 0.000E+00
vV1 -6.832E-03
TOTAL POWER DISSIPATION 6.15E-02 WATTS
JOB CONCLUDED
TOTAL JOB TIME .03
28
GraficeAnaliza in domeniul frecventa
Tensiunea pe nodul de intrare:
29
Tensiunea pe nodul de iesire:
30
Analiza in domeniul tranzitoriu
Tensiunea pe nodul de intrare:
31
Tensiunea pe nodul de iesire:
32
Simulare in MultiSim
33
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