Specifications

Q1 9012
Q2 9012
Q3 9012
Q4 9012
R1 4K7
R3 4K7
R5 4K7
R7 4K7
VCC
EA/VP
31
X1
19
X2
18
RESET
9
RD
17
WR
16
INT0
12
INT1
13
T0
14
T1
15
P10
1
P11
2
P12
3
P13
4
P14
5
P15
6
P16
7
P17
8
P00
39
P01
38
P02
37
P03
36
P04
35
P05
34
P06
33
P07
32
P20
21
P21
22
P22
23
P23
24
P24
25
P25
26
P26
27
P27
28
PSEN
29
ALE/P
30
TXD
11
RXD
10
U1 89S8252
C1 C2
E2
10U/50V
VCC
X1 X2
R9 10K
K1 FUNC K2 DOWN K3 UP K4 ENTER
P27 P26 P25 P24
P22 P23
P22 P14P23
X1 X2
R2 4K7
R4 4K7
R6 4K7
R8 4K7
DPY
1e
1
1d
2
1c
3
1dp
4
2e
5
2d
6
2g
7
2c
8
2dp
9
2b
10
2a
11
2f
12
1b
15
1a
16
1g
17
1f
18
a
bf
c
g
d
e
dp
a
bf
c
g
d
e
dp
V+
13
V+
14
U2 DR56
DPY
1e
1
1d
2
1c
3
1dp
4
2e
5
2d
6
2g
7
2c
8
2dp
9
2b
10
2a
11
2f
12
1b
15
1a
16
1g
17
1f
18
a
bf
c
g
d
e
dp
a
bf
c
g
d
e
dp
V+
13
V+
14
U3 DR56
P00 P01 P02 P03 P04 P05 P06 P07
P00 P01 P02 P03 P04 P05 P06 P07
P00 P01 P02 P03 P04 P05 P06 P07
P00 P01 P02 P03 P04 P05 P06 P07
P00 P01 P02 P03 P04 P05 P06 P07
P13
P12 CMP
P24 P25 P26 P27
RELY
P12
C3 104
VCC
1 2 3 4 5 6 7 8 9 10
J1 IDC10
CMP GND GND VCC VCC
P13
RELY
P14
R11 100
Y1
24MHZ
3 2
1
8 4
U4A LM358
5 6
7
U4B LM358
R13 51
R16 10K
R14 470K
R17 510
R15 10K
R12 51K
E1 2u2
C4 104
VCC
MIC1 MIC
GND VCC
VR1 1M
C5 104
R10 100
P17
16. DISPLAY PCB
27