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Schematic
VCC
R121
750
METER PCB
MAIN PCB
SW1A
1
C32
2
3
563
SW1B
4
C39
C28
R97
5
CH1
240
6
47/10
682
J1B
J1A
R81
R82
R98
R90
100K
2L
1L
300K
300K
3M3
IC8C
2G
1G
9
8
10
R89
1/2VCC
2R
1R
OA4
3M3
R99
100K
SW2A
1
2
3
SW2B
CH2
4
C41
C29
R116
5
240
6
47/10
682
J2B
J2A
R83
R84
R102
R92
100K
2L
1L
300K
300K
3M3
VCC
IC8D
2G
1G
13
14
12
R91
1/2VCC
2R
1R
OA4
3M3
R103
100K
SW3A
1
2
3
4
SW3B
C42
C30
R117
CH3
5
240
6
682
47/10
J3B
J3A
R85
R86
R106
R94
100K
2L
1L
300K
300K
3M3
IC8A
2G
1G
2
1
3
1/2VCC
R93
2R
1R
OA4
3M3
R107
100K
SW4A
1
C33
2
3
563
4
SW4B
C43
C31
R118
CH4
5
240
6
682
47/10
J4B
J4A
R87
R88
R110
R96
2L
1L
100K
300K
300K
3M3
IC8B
2G
1G
6
7
5
1/2VCC
R95
2R
1R
OA4
3M3
R111
100K
SWA
SWA
C100
SWB
SWB
D30
104
LED
A1
B1
A2
B2
B3
A3
B4
A4
VCC
X3
X11
X12
X2
X5
X6
L1
R1
L2
R2
R3
L3
R4
L4
VCC
R100
L1
100K
R101
R1
C1
100K
332
R114
100K
Vcc
L
C54
IC2A
2
R19
1
4.7/25
3
9.1K
1/2VCC
LM324A
R104
L2
100K
R33
R35
470K
1M
C26
R105
R2
100K
471
IC2D
LM324A
13
D10
14
D9
12
1N4148
1N4148
R2
10K
C56
R108
L3
100K
332
R115
100K
Vcc
R
C55
IC4A
2
R20
1
R109
R3
4.7/25
3
9.1K
1/2VCC
100K
LM324A
R34
R36
470K
1M
C27
471
IC4D
R112
13
D14
L4
100K
14
D13
12
1N4148
1N4148
R5
LM324A
10K
R113
R4
100K
IC1
LED4A
1
39
A4
P10
P00
VCC
LED3A
2
38
B4
P11
P01
LED2A
3
37
A3
P12
P02
LED1A
4
36
B3
P13
P03
C101
LED1B
5
35
B2
P14
P04
104
LED2B
6
34
A2
P15
P05
LED3B
7
33
B1
P16
P06
LED4B
8
32
A1
P17
P07
CH B
13
21
INT1
P20
SWA
CH A
12
22
P21
INT0
P21
23
P22
P22
15
24
P23
T1
P23
14
25
P24
T0
P24
C9
26
P25
P25
47pF
31
27
P26
VCC
EA/VP
P26
XT1
28
P27
P27
12M
19
X1
18
X2
C10
47pF
9
10
RESET
RXD
11
TXD
SWB
VCC
17
30
RD
ALE/P
16
29
WR
PSEN
C11
8051
10/10
R1
10K
R23
R21
680K
C13
91K
C20
104
181
IC2C
C12
IC2B
9
D8
R14
6
C14
8
7
10
1K
1N4148
104
5
1/2VCC
R12
104
R25
LM324A
1K
LM324A
68K
Vcc
IC3A
IC3B
3
A
6
D11
1
B
C15
7
2
5
1N4148
LM324A
104
LM324A
C22
C24
R37
R41
R38
100K
4.7/10
330K
100K
2.2/16
R24
R22
680K
C17
91K
C21
104
181
IC4C
C16
IC4B
9
D12
R18
6
LM324A
C18
8
7
10
1K
1N4148
104
5
1/2VCC
LM324A
R16
104
R26
1K
68K
IC3D
IC3C
12
A
9
D15
14
B
C19
8
13
10
1N4148
LM324A
104
LM324A
C23
C25
R39
R43
R40
100K
4.7/10
330K
100K
2.2/16
13
8
14
9
IC5
R72
2
b2b
26
Q1
R69
3
b2f
31
470
Q2
4
470
Q3
R66
5
b2a
25
Q4
R70
6
b2g
30
470
Q5
R75
7
b3c
20
Q6
470
R63
VCC
42
b3b
19
470
Q7
R73
12
41
b3f
24
2a
470
SD
Q8
R78
40
b3a
18
1b
2f
2b
470
Q9
R65
39
b3g
23
2g
470
Q10
R62
38
a2f
14
Q11
470
R59
37
a2b
9
1c
2e
2c
Q12
470
R52
36
a3b
2
2d
470
Q13
R57
35
a3f
7
470
Q14
R51
34
a3a
1
470
Q15
R56
11
33
a3g
470
6
LE
Q16
R58
31
a2a
8
Q17
470
R76
30
a2g
13
470
Q18
R54
29
a3d
4
470
Q19
R55
9
28
a3e
5
10
12
11
15
470
A
Q20
R53
27
a3c
3
470
Q21
26
Q22
470
240
R80
25
a1b.1c
15
30
25
31
26
Q23
R77
13
24
a2d
11
CK
Q24
R61
23
a2e
12
470
Q25
R60
22
a2c
10
470
Q26
R74
15
b3e
22
Q27
470
R64
16
b3d
21
Q28
470
R79
17
b1b,1c
32
470
Q29
R68
18
b2d
28
2a
240
Q30
R71
10
19
b2e
29
1b
2f
2b
470
OE
Q31
R67
20
b2c
27
2g
470
Q32
470
14
1c
2e
2c
SQ32
2d
M66313FP
27
29
28
32
R29
22K
R27
6.8K
R30
C2
22K
47/6.3
VCC
C7
104
SW5
POWER
X7
X8
X4
X1
D18
J10
2
2
1
C8
R31
1N4004
C38
104
22K
1
1
470/25
POWER
R28
6.8K
R32
C3
22K
47/6.3
Vcc
R48
5K1
A
R6
6K2
B
R46
1K1
VCC
VCC
2
7
1
6
R119
R10
510
510
D1
D20
P27
LED1A
A
LED
LED
BT-A41
3a
D2
D21
3f
3b
P26
LED2A
3g
3e
3c
LED
LED
3d
D3
D22
P25
LED3A
LED
LED
VCC
4
5
3
D4
D23
P24
LED4A
VCC
19
24
18
23
LED
LED
R120
510
D5
D24
P23
LED1B
B
BT-A41
LED
LED
3a
3f
3b
3g
D6
D25
P22
LED2B
3e
3c
3d
LED
LED
D7
D26
P21
LED3B
LED
LED
21
22
20
D27
LED4B
LED
C6
C4
C5
104
104
104
IC7
7805
VCC
3
Vin
Vout
C36
R8
1.0/10
10K
1/2VCC
R9
C40
6K2
470/10
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