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- Words: 451
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H
H
SPEACH
18
2
17
R3
3
16
100K
4
R2 100K
100nf
IC2 MT8870
C4 G
1
300K
15
RL1 5V
RST 9
TR1-10
G
R9-18
D1 IN4004
4K7
5 P1.4
BC558 3 P1.2
12
2 P1.1
8
11
1 P1.0
9
10
RL2
4K7
P0.1 38
D2 IN4004 BC558
RL3
4K7
P0.2 37
DTMF DECODER F
C1 1uf
P0.0 39
13
7
31 EA
R4
4 P1.3
6 3.58MHz
40 VCC
C5
14
5
Y2
100nf
+5V
D3 IN4004 BC558
TP1
F
RL4
TP2
4K7
D4 IN4004
PORT2
TP4 TP5
BC558
TP6
RL5
4K7
P0.4 35
TELEPHONE RELAYs
P0.3 36
TP3
D5 IN4004
TP7 BC558
TP8
IC1 AT89C51
E
RL6
4K7
P0.5 34
BC558 +5V
LED1
Relay 1 to 10=5V
D6 IN4004
E
RL7
R1
330R
4K7
P0.6 33
8 P1.7
D7 IN4004
7 P1.6
SWITCH ON/OFF HOOK
BC558
RL8
15 P3.5/T1
RING DETECT
17 P3.7
MELODY
4K7
P0.7 32
D8 IN4004 BC558
RL9
D
D
4K7
P3.0 10
D9 IN4004
C2
30pf
12MHz
18 XTL2
BC558
RL10
TR10
Y1
R18
P3.1 11
19 XTL1
C3
P3.4
P3.6
14
16
Gnd
D10 IN4004
4K7 BC558
270R
Gnd +5V
R6
R5 R7
C
13
270R
12
D
11
C
10
C8 10nf
DIAL-TONE TO SPEACH
C
100K 2 1
A
3 R8
C6 22nf 5 C7
6
9
2M2
B
8 4
C9 10nf
BUSY-TONE TO STANDBY
7 IC3 ABCD = CD4093
100nf
Gnd
TONE GENERATOR B
B
A
A
1
2
3
4
5
6
1
2
3
4
-
D11 1 2 3 4
1
AC
82K 2
D PSTN LINE IN
AC
C10
1K
1uf
IC4 Out UM66T Vcc Gnd
R22
4
-
+5
R21
R19
3
+
BRIDGE DIODE
TR11 BC548 R20
D
ZD1
220 R
CALL HOLDING
560 R
RJ11
3V C10
MELODY
P3.7
1uf
+5 2K2
Gnd R21
4
1
6
2
SWITCH HOOK ON/OFF
HOOK SWITCH
C11
+5
R23
R22
IC6 L9711
22K
C
330nf
D13
P1.6
1
5
2
4
10K
IC5 LCA110
RING DETECT
T1
C
IN4004
TRUNK LINE
RING DETECTOR
R38
RL10
RL9
BELL VOLTAGE
120R 2W SPEACH BUS STANDBY BUS LED2
RL1 R24
C12
330R
B
TR13 D1111 +18V
TP#1
TR12 BC548
T1
D15 3
+
AC
-
AC
220V AC
1 24V
4
2
BRIDGE DIODE
Gnd
D14 IN4148
B
55V C14 2200uf 40V
R35 68K
GYRATOR
6K8 220R 1W
R34 10K 10uf
TP1 R25
R26
IC7
7818
TR14 D1111 Gnd LED9
R36 10K
C13
POWER SUPPLY
10uf R31
330R
RL8
TP#8
R37 68K
GYRATOR TP8 Gnd
R32 A
6K8 R33
220R 1W
+5V
TR19 BC548 D21 IN4148
C16
100nf
IC8
A
7805 C15
100nf
STATUS INDICATOR
1
2
3
4
2
3
4
5
6
H
H
SPEACH
18
2
17
R3
3
16
100K
4
R2 100K
100nf
IC2 MT8870
C4 G
1
300K
15
RL1 5V
RST 9
TR1-10
G
R9-18
D1 IN4004
4K7
5 P1.4
BC558 3 P1.2
12
2 P1.1
8
11
1 P1.0
9
10
RL2
4K7
P0.1 38
D2 IN4004 BC558
RL3
4K7
P0.2 37
DTMF DECODER F
C1 1uf
P0.0 39
13
7
31 EA
R4
4 P1.3
6 3.58MHz
40 VCC
C5
14
5
Y2
100nf
+5V
D3 IN4004 BC558
TP1
F
RL4
TP2
4K7
D4 IN4004
PORT2
TP4 TP5
BC558
TP6
RL5
4K7
P0.4 35
TELEPHONE RELAYs
P0.3 36
TP3
D5 IN4004
TP7 BC558
TP8
IC1 AT89C51
E
RL6
4K7
P0.5 34
BC558 +5V
LED1
Relay 1 to 10=5V
D6 IN4004
E
RL7
R1
330R
4K7
P0.6 33
8 P1.7
D7 IN4004
7 P1.6
SWITCH ON/OFF HOOK
BC558
RL8
15 P3.5/T1
RING DETECT
17 P3.7
MELODY
4K7
P0.7 32
D8 IN4004 BC558
RL9
D
D
4K7
P3.0 10
D9 IN4004
C2
30pf
12MHz
18 XTL2
BC558
RL10
TR10
Y1
R18
P3.1 11
19 XTL1
C3
P3.4
P3.6
14
16
Gnd
D10 IN4004
4K7 BC558
270R
Gnd +5V
R6
R5 R7
C
13
270R
12
D
11
C
10
C8 10nf
DIAL-TONE TO SPEACH
C
100K 2 1
A
3 R8
C6 22nf 5 C7
6
9
2M2
B
8 4
C9 10nf
BUSY-TONE TO STANDBY
7 IC3 ABCD = CD4093
100nf
Gnd
TONE GENERATOR B
B
A
A
1
2
3
4
5
6
1
2
3
4
-
D11 1 2 3 4
1
AC
82K 2
D PSTN LINE IN
AC
C10
1K
1uf
IC4 Out UM66T Vcc Gnd
R22
4
-
+5
R21
R19
3
+
BRIDGE DIODE
TR11 BC548 R20
D
ZD1
220 R
CALL HOLDING
560 R
RJ11
3V C10
MELODY
P3.7
1uf
+5 2K2
Gnd R21
4
1
6
2
SWITCH HOOK ON/OFF
HOOK SWITCH
C11
+5
R23
R22
IC6 L9711
22K
C
330nf
D13
P1.6
1
5
2
4
10K
IC5 LCA110
RING DETECT
T1
C
IN4004
TRUNK LINE
RING DETECTOR
R38
RL10
RL9
BELL VOLTAGE
120R 2W SPEACH BUS STANDBY BUS LED2
RL1 R24
C12
330R
B
TR13 D1111 +18V
TP#1
TR12 BC548
T1
D15 3
+
AC
-
AC
220V AC
1 24V
4
2
BRIDGE DIODE
Gnd
D14 IN4148
B
55V C14 2200uf 40V
R35 68K
GYRATOR
6K8 220R 1W
R34 10K 10uf
TP1 R25
R26
IC7
7818
TR14 D1111 Gnd LED9
R36 10K
C13
POWER SUPPLY
10uf R31
330R
RL8
TP#8
R37 68K
GYRATOR TP8 Gnd
R32 A
6K8 R33
220R 1W
+5V
TR19 BC548 D21 IN4148
C16
100nf
IC8
A
7805 C15
100nf
STATUS INDICATOR
1
2
3
4
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