Figure 10 digital display schematic drawing, Page 20 – HF scientific Oil Content Bilge Alarm User Manual
Page 26
Bilge Alarm (02/02)
Rev. 1.3
Figure 10
Digital Display Schematic Drawing
REF HI
+5V
POL
(MINUS)
AB4 A3 B3 C3 D3 E3 F3 G3 A2 B2 C2 D2 E2 F2 G2
-5V
20
19
23
16
24
15
18
17
22
12
11 10
9
14
13
25
1
36
47.5K
R2
47.5K
R3
24.3K
R4
475
C1
0.01
C6
10
35V
IN HI
IN LO
REF LO COMM C+REF C-REF INT BUFF A/Z OSC3 OSC2 OSC1
C2
0.1
R5
C4
0.47
0.22
C3
30
35
32
34
33
27
28
29
38
39
40
C5
100pf
R6
100K
5V
21
26
GND
DS4
DS3
DS2
U1
ICL7107CPL
a4
b4
a
b
c
d
e
f
g
3
3
3
3
3
3
3
a
b
c
d
g
f
e
2
+
2
2
2
2
2
2
R1
1M
mfd
31
mfd
ohm
mfd
mfd
IN
mfd
Page 20