1
1
2
2
3
3
4
4
5
5
6
6
D
D
C
C
B
B
A
A
4.7K
R1
.022u
C1
.0022u
C2
15K
R2
.1u
C3
.001u
C4
560p
C5
39K
R3
200K
R4
1.2M
R5
-
+
2
3
1
4
8
LM358
U2:1
-
+
6
5
7
LM358
U2:2
+5V
VAN
20K
R8
B25
Q1
+5V
100K
R7
10K
R6
10K
R9
+5V
2
3
A4
D1:1
1
3
A4
D1:2
560p
C6
10K
R13
+5V
2
3
A4
D2:1
1
3
A4
D2:2
560p
C7
10K
R14
+5V
2
3
A4
D3:1
1
3
A4
D3:2
560p
C8
560p
C10
.001u
C11
+
.47u
C12
OUT
1
SENSE
2
SHDN
3
G
N
D
4
E
R
R
5
V
T
A
P
6
F
D
B
K
7
IN
8
MIC2951
VR1
+VIN
+
.47u
C13
+5V
*
C9
10K
R15
+5V
CS
3
SCLK
4
SI
5
SO
6
VCC
2
NC1
8
ORG
1
GND
7
CAT93C46
U3
.1u
C14
+5V
100K
R16
0
1
2
3
4
5
6
7
8
9
*
#
10K
R10
+5V
10K
R11
+5V
10K
R12
+5V
OSC2
42
TCAP
41
D7
39
O
S
C
1
4
3
A5
7
A6
6
A7
5
A4
8
A3
9
A1
11
A0
12
C4
27
C1
30
C6
25
G
N
D
2
2
TCMP
38
IRQ
2
V
D
D
4
4
V
P
P
4
S
S
3
7
B3
16
B0
13
B1
14
A2
10
C5
26
C3
28
C0
31
C2
29
C7
24
B4
17
B7
21
B6
20
RES
1
B2
15
B5
19
SCK
36
MOSI
35
MISO
34
RDI
32
TDO
33
N
C
4
3
NC1
18
NC2
23
N
C
3
4
0
MC68HC705C8
U1
.1u
C15
+5V
4.7K
R54
D25
Q8
HORN
4.7K
R53
B25
Q7
1K
R49
BUSY
1K
R50
CALL
1K
R51
PTT
4.7K
R52
560p
C26
D25
Q6
100p
C25
4.7K
R48
4.7K
R46
20K
R24
10K
R25
20K
R26
10K
R27
20K
R28
10K
R29
20K
R30
10K
R31
20K
R32
10K
R33
20K
R34
10K
R35
20K
R36
10K
R37
20K
R38
20K
R39
Q1
11
Q2
12
Q4
14
Q3
13
IN
+
1
GS
3
V
R
ef
4
IN
H
5
ESt
16
IN-
2
P
W
D
N
6
StD
15
OSC2
8
OSC1
7
TOE
10
V
S
S
9
St/GT
17
V
D
D
1
8
*
U4
VAN
11
33
22
1M
R41
100K
R40
.022u
C23
470K
R42
1.2M
R43
2
3
A4
D4:1
1
3
A4
D4:2
.1u
C24
+5V
4.7K
R44
D25
Q3
+VIN
82R
R45
BSS
Q5
B25
Q4
47K
R47
+VIN
1
3
A7
D5:1
3
2
A7
D5:2
JU4
JU5
22K
R18
39K
R21
11
33
22
10K
R22
.01u
C18
22K
R19
100K
R20
560p
C19
D25
Q2
27K
R23
100p
C21
+VIN
+VIN
TX TONE OUT
[GRN]
P1:1
+VIN
[RED]
+5.5 - 15V
P1:2
COR IN
[BRN]
P1:3
GND
[BLK]
P1:4
ALERT TONE
[BLU]
SPKR OUT
P1:5
TONE IN
[ORG]
P1:6
MON/SQ OUT
[YEL]
P1:7
MIC MUTE OUT
[GRN/W]
P1:8
PTT OUT
[WHT]
P1:9
SCAN/DISABLE OUT
[GRY/W]
P1:10
PTT IN
[GRY]
P1:11
MONITOR IN
[ORG/W]
PROG IN
P1:12
EMER/AUX IN
[VIO]
P1:13
22p
C16
22p
C17
4.7M
R17
.1u
C22
+5V
CP
CJS
1991-09-23
DML
2013-12-19
B-2
1 of 1
7249
MIDIAN ELECTRONICS, INC.
DATE:
DESIGN:
DWN BY:
REV:
APPR
COPYRIGHT ©
REV
SHEET
PROJECT NUMBER
DOCUMENT NAME
SCHEMATIC
2013
TT-9
.47u
C20
NOTES:
* = NOT INSTALLED
DTMF DECODER
2 TONE
5 TONE
PULSE TONE
DECODER
3.58 MHz
Y1
