Circuit diagram

5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
DVM
2
3
PT1A
PT2B
CV-LED
CC-LED
U6
TRANSFORMER I/P
16/05/2007
PS 1440 CONTROL CIRCUIT
SIL/16/0328
00
DATE :-
SCHEMATIC CIRCUIT DIAGRAM OF
DRG NO. REV.
A M E N D
NO
DESCRIPTION APP CHK
DATE
+VCC
A
I
+VCC
B
-VEE
+Vr
+Vr
+VCC
+VCC
+12V
-12V
C2
470uF/35v
2.2uF/63V
C11
10uF/25V
C22
R22 2K2
C18
100KPFQ2
BC547
3
2
1
R20 220E
C9
1n
R19
1k
R8
6K8
1
2
U4A
LM358
6
5
84
1
-
+
V+V-
OUT
R24 100K
R5
15K
LM336/2.5V
4 8
5
R10
2K2
Q1
BC556
3
2
1
R7
10K
R38
2R2
P0T2
1K
CN2
R36
1k
R25 470K
C8
100NF
R11470E
THERMAL SWITCH
CN4
1
2
R12 12K
C7
100Kpf
C17
100KPF
6.2V.1/2W
Z1
1 2
1K
CN10
R23 10M
220E,3W
R14
D2
1N4007
12
R28
470E
Q3
BC547
1
2
3
C3
100uF/25v
Q4
BC556
3
2
1
100ER26
R2
1k
10K
100E R1
R3
1k
10K
C21
33NF
C11
100KPF
C10
10uF/25V
C1
2200uF/35v
7912
U2
3
1
2
TL494
U2
2
1
3
4
5
6
7
8
9 10
11 12
13
14
16 15
2
1
3
4
5
6
7
8
9 10
11 12
13
14
16 15
U1
7812
3
2
1
1
2
R27
470E
1
2
180K//680KR18
22K
PR4
R15
10K
R14
10K
C15
1n
C13
22NF
R4
15k
D1 1N 4007
R14
1k
10uF/25V
C30
C26
10uF/25v
R13
220E,3W
500E
PR2
C20
100KPF
C4
100uF/25v
5KPR1
10uF/25V
C23
THERMAL INDICATOR
CN5
1
2
R1
150E
R6 10E
1
2
100nF
C15
22K PR4
C14 22NF
V SENSE
1
2
6.2V,1/2W
Z2
1 2
C16
470NF
R9 10k
C21
1n
R39+R37
47K+56K
220pF
C12
I SENSE
1
2
C24
1n
C19
100KPF
TL431
U5
4 8
5
R21
10K