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V 125
CIRCUIT DIAGRAM
3? Digit LCD Voltmeter Module
V+
1
1
IC1
INHI
INLO
3
4
L1
V+
R2
1M
R6
100k
R5
3k
R1
300k
C3
100nF
C1
68nF
C2
220nF
C4
100nF
R3 100k
C5
100pF
27
28
29
31
30
32
34
33
35
36
40
39
38
INT
BUF
A/Z
IN HI
IN LO
COM
CREF+
CREF-
REF LO
REF HI
OSC1
OSC2
OSC3
V+
a1
b1
c1
d1
e1
f1
g1
a2
b2
c2
d2
e2
f2
g2
a3
b3
c3
d3
e3
f3
g3
bc4
POL
V- TEST BP
26 37
5
4
3
2
8
6
7
12
11
10
9
14
13
25
23
16
24
15
18
17
22
19
20
21
24
23
21
20
19
25
22
28
27
17
16
14
1
26
3
2
12
11
10
4
5
8
7
15
a1
b1
c1
d1
e1
f1
g1
a2
b2
c2
d2
e2
f2
g2
a3
b3
c3
d3
e3
f3
g3
ab4
POL
COM
LCD1
DP1
DP2
DP3
LOBAT
199.9
18
19.99
13
1.999
9
6
R9
1M
R8
1M
R7
1M
6
7
8
DP1
DP2
DP3
V+
R4
1.5k
R10
100k
R11
100k
V-
2
Q1
3904
5
XDP
PIN FUNCTIONS
1. V+ Positive power supply connection.
2. V- Negative power supply connection.
3. INHI Positive measuring input with reference to IN LO.
4. INLO Negative measuring input with reference to IN HI.
5. XDP Connect to DP1, 2 or 3 to display required decimal point.
6. DP1 Connect to XDP to display Decimal Point 1 (199.9).
7. DP2 Connect to XDP to display Decimal Point 2 (19.99).
8. DP3 Connect to XDP to display Decimal Point 3 (1.999).
Solder Links:
L1 Normally Closed, connects COM to INLO.
Analogue inputs must be no closer than 1V
to either the positive or negative supply.
www.martelmeters.com
page 3 of 4
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