- 8 -
5. Microphone Circuit
The microphone circuit is divided into two parts: The Front Process Section and Echo
Process Section
5.1 Front Section Circuit: Mainly performing volume adjusting/amplifying/modifying
function. The flow chart is shown as Figure 5.
MIC1
MIC2
V901
Following
Amplification
N904B
Voiced
Circuit
Echo
Process
Section
RP901
RP902
N903A
N903B
N904A
(Figure 5)
- 19 -
92
VOLTAGE
REGULATOR
DIODE
5.1V 1/2W
VD436,VD411
93
VOLTAGE
REGULATOR
DIODE
12V 1/2W
VD429
94
VOLTAGE
REGULATOR
DIODE
6.8V 1/2W
VD431,VD432,VD438,VD439
95
TRIODE
2N5401
V404,V409,V410,V416,V421,V422,V440,V436,V439
96
TRIODE
2N5551
V401,V402,V403,V405~V408,V413,V414,V415,V417~V420,
V435,V437,V438
97
TRIODE
8050C
V432,V445,V441,V442
99
TRIODE
9014C
V426~V429,V431,V443,V444,V446
100 TRIODE
9015C
V430
TRIODE
S8550D
V433
101 TRIODE
KB688O
V412,V424
TRIODE
KB688Y
V412,V424
102 TRIODE
KD718O
V411,V423
TRIODE
KD718Y
V411,V423
103 IC
LM324N DIP
N417,N418
104 IC
NJM4558D DIP
N403~N408,N420
IC
4558C DIP
N403~N408,N420
105 IC
L7812CV GOLD-SEALED TO-
220
N412
IC
LM7812 GOLD-SEALED TO-
220
N412
106 IC
CD4051 DIP
N416,N419
107 IC
CD4053BCN DIP
N410,N411
108 IC
CD4052BCN DIP
N401
109 IC
M62446FP SOP
N402
110 IC
24C02 DIP
N421
111
I C
LM1875T T05B
N413,N414,N415
112
SOFTWARE
PROGRAM CPU
CPU-AV210(RU)-0
N422
113
CRYSTAL
OSCILLATOR
12.00MHz 49-U
G601
114 RELAY
JH1806-012-(3H1
£ «
1Z1) DC12V Y402
115 RELAY
JH4237-012-2H DC12V
Y401
116
PCB
4210-3
117
TERMINAL
SOCKET
AV6-8.4-53
XC401
118
TERMINAL
SOCKET
AV8-8.4-62
XC402
119
TERMINAL
SOCKET
AV1-8.4-5 BLACK
XC403
120 SOCKET
8 PINS 2.5mm
XS5
121 SOCKET
9 PINS 2.5mm
XS4
122 SOCKET
2 PINS 7.92mm
XS1,XS2
123 SOCKET
6 PINS 3.96mm
XS3
124
CONNECTOR'S
SOCKET
WP4-10A
XL401
125
CONNECTOR'S
SOCKET
WP6-10A
XL402
126
CONNECTION
CORDS
¦ µ
0.6 SHAPED 7.5mm
W1~W3,W5,W8,W10~W12,W14~W16,W18~W22,W24,
W26~W28,W30,W36,W38,W39,W42,W43,W49,W50,W52,
W53,W56,W58,W59,W61,W63,W64,W66,W69,W72~W76,
W78,W79,W81,W84,W87~W89,W91,W92,W94~W96,
W98~W102,W105,W106,W108~W110,W113,W116,
W118,W119,W125,W127,W135,W136,W138~W140,
W149~W153,W155~W162,W164,W165,W179,W184,
W187~W189,W193~W195,W197~W199,W205,W206
