HF scientific Oil Content Bilge Alarm - Manual (Page 28)

Bilge Alarm (02/02)
Rev. 1.3
Figure 12
Amplifier Board Schematic
2N5785
ALARM
D.V.M.
+15V
1.21M
10mfd
+
C8 555
1
7
LM
U6
2
6
4
3
8
.01mfd
C9
15K
R10
308
+
-
3.3mfd
C7
3.3mfd
C6
+15V
-15V
3
2
+
5
+
IN
3
1 2
NO
R
M
.
ALAR
M SET
1.21M
R9
RECORDER
-15V
-15V
+15V
1K
R3
100pf
4
1
C4
8
U3
7
6
+
4
308
U1
-
3
+15V
2
7
R6
100pf
10K
R8
+15V
-15V
1
C2
6
8
500K
SW1
5K
R7
SW2
R4
3.3mfd
C3
3.3mfd
C1
+
1.82M
R2
ALARM OUT
-15V
1mfd
C5 +
11
10V REC. OUT
ZERO POT
U5 6
+15V
4
-15V
U4
3 +
311
-
2 8
2
3
1 7
5
6
+15V
-15V
3
4
+
741
4
+
U2
741
-
6
7
9
OUT 7
-
+15V
2
7
R1
182K
6
Page 22