HX6B收音机课件

RP
(3I B3 I B2 I B3 )R4 (I B2 I B3 )R3 1.5
(3I B3 I B2 I B3 )R4 (I B2 I B3 )R3 1.5
IB2
1.5 (1 3 )I B3R4 R3 R4
I B3R3
1.5 150 K
21I B3
(2 3 100 )
103
4
4
104
5
5
105
�0.5%
6
6
�0.25%
7
7
�0.1%
8
8
9
9
101
GB
R8 100
3V
4 T4VT3VT3 VT3 (AGC) AGCR3VT2 Vb3--Ib3Ic3Vc3R3 Vb2Ib2Ic2 C4C5
GB
R8 100
3V
5 RPVT4 RPVT4
GB
R8 100
3V
6(OTL)
VT5VT6R7R8R9R10VT5VT6 T5C9C9
GB
1
R1 200k
R2 1.8K
R3 120K
R4 30K
R5 100k
R6 100
R7 120
R8 100
R9 120
R10 100
R11 330
11
I
0 1
2 3
4 5
6 7
8
9
II
III
0
0
100
1
1
101
�1%
2
2
102
�2%
3
3
1. 2. 3. ""
10.7MHz 10.7MHz "" 455kHz455kHz" "----455kHz .
:
AGC
(455KHz) ຫໍສະໝຸດ Baidu
AGC
:
FM
(10.7MHz)
AFC
:
:
/FM/AM
HX-6B
R8 100
3V
V-A
� � � R60.8V �
� R'
P1=P2=I1U1=I2U2 U12/R'=U22/R2R'=R2U12/U22=R2(N1/N2)2 R'
HX-6B
VT1
VCC I B1R1 U BE I E1R2
I B1
VCC
U BE R1
I E1R2
IE1 IC1 U BE 0.7V
IC4=�4IB4=2.25mA
�4=150IC4=23mAC�4150 IC4=23mAR5
R5
VCC
U BE4 IB4
VCC U BE4
IC4 / 4
VCC 3V U BE4 0.7V
HX-6B
VT56
UR9+UR10=1.5VUR10=0.682V RIB5+UBE5-UR10=0
IB5
IB6
U R10 U BE5 R
0.682 - 0.68 90
0.022 mA
IC5=IC6=�5IB5=�6IB6=1.5mA�5= �6=70 �6IB6IC6IC6=1.5mAD
(UBE )
VT56
UOM=(1.5-UCES)/ 2 IOM=UOM/RLRL=8
POM=UOM�IOM=UOM2/RL=(1.5-UCES)2/2RL UCES=0.3VPOM=90 mW UCES=0V POM=140 mW
(2 3 100)
= [1.5/3630k]-0.04 IB2
IC3=�3IB3=24uA UCE3=2.2-IC3(R4+RP)=1.36V
�2�3100IC2=0.5mAB IC2=0.5mAR4
HX-6B
VT4
IB4=(2.2-UBE4)/R5=0.015mA
UCE4=2.2-RIC4=2.2-220X0.00225=1.705V
HX-6B AM
�
� � � � � � �
:
()
( )
1AM 2 (FM)
550kHz-1600kHz
2MHz-24MHz
() 88MHz108MHz
:
AMFM FM STEREODAB DRM
LW MW SW FM
......
2060
//
50-70
/
//
70-80
/
//
90 //
//
:
///
/3-5//8-12// 8-12
LCD/LED
// PLL / SSB
:
455KHz
465KHz455KHz 10.7MHz
f -- f= f ()
1
1 2
AGC
HX-6B
"�"
HX-6B
HX-6B
R8 100
GB 3V
1 2
1HX-6B 2
1 CAT 1LabT l f=l2LabCACA
GB
R8 100
3V
2
VTl ()465KHz
VT lT2CB465 KHzC lT lLcd T2CBCB T2 VT 1 T2C2VT 1
VCC 2.2V
IB1 4.8A
1
IC1 I B1
62.5
IC1=0.3mAA�1( 62.5) �1 120IC1=0.3mA
�1=120IC1=0.3mA R1
VCC I B1R1 U BE I E1R2
R1
VCC
U BE I B1
I E1R2
1 120
IE1 IC1 0.3mA U BE 0.7V
VCC 2.2V
I B1
IC1 1
2.5A
R1 384K
HX-6B
IR4
+2.2V
IC2
R4
VT2 IR4 IC3 IB2 IB3
R3
I R4R4 (I B2 I B3 )R3 0.7 2.2
IB2
IC3 I B3
VT2
VT3
I R4R4 (I B2 I B3 )R3 1.5 (IC3 I B2 I B3 )R4 (I B2 I B3 )R3 1.5
GB
R8 100
3V
2 ibie
icic=ie-ibicT3
T3""465KHz465KHz 465KHz ""465KHz
iC
i
b
ie
GB
R8 100
3V
VT lT3 ()TlLcd VT lC2VT lT1
465KHz T3465KHz 465KHzT3
GB
R8 100
3V
3 VT2VT3VT2 T4465KHz
IC2=�2IB2=0.5mA UCE2=2.2 IB2=5uA
VT3
IB2
1.5 (1 3 )IB3R4 R3 R4
I B3R3
(2 3 100 )
IB3
IB3 [2.2-UBE3- IB2 (R3+R4)]/(R3+�3R4+�3RP)
( 1.5 150K
IB2 ) / 21
0.24uA