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Schematic Diagrams
8
8-9
180PF
C10
R15
33
MMBT3904
Q5
R14
10K
180PF
C9
R13
20
R11
47K
R9
4.7K
R5
1.00K
R6
3.32K
HCU04
HCU04
D
HC74
CL
Q
Q
PR
TP1
TP30
CR6
MBR140
CR2
1N5397
CR5
MBR140
10
C6
CR3
1N5397
10000
C7
.033
C2
2620A-6501
J3
EG
N
L
1/8A SB
180PF
C59
J2
P10
RT1
RXE065
C39
.047
R48
10K
1.0
C34
4.02K
R46
1.30K
R44
11.0K
R19
R20
59.0K
VCC
TP2
TP6
TP5
TP3
TP4
TP32
TP7
TP10
TP9
TP14
TP31
S1
VR2
1N5233
1N5235B
VR3
VR1
1N5232
1.0
C5
T1
U28
LM358DT
GND VC
VIN
VSW
FB
U9
LT1170
U28
LM358DT
MBRD360
CR10
220
C18
MBRD360
CR1
220
C1
A
MH1
45.3K
R30
11.0K
R31
47
C26
CR13
MMBD7000
100
R26
0.1
C21
Q4
MMBT3904
Q2
MMBT3906
MMBT3904
Q6
Q8
IRL024
Q7
IRL024
R38
0.02
47
C30
47
C31
2200
C14
FLUKE45-6401
T2
LM317T
U6
IN OUT
ADJ
CR12
BAS16
D
HC74
CL
Q
Q
PR
R47
10K
1000PF
C35
U18
LM79L05A
GND
OUTIN
HCU04HCU04HCU04HCU04
CR11
BAS16
R28
470
R34
470
R40
5.1K
MMBD7000
CR9
CR8
MMBD7000
LM317L
U19
IN OUT
ADJ
47K
R22
2.2
C17
1.0
C32
VCC
Q1
MMBT3906
BAS16
CR4
470
C13
470
C12
CR7
BAW56
1.0
C4
MMBT3906
Q3
R4
10K
R12
47K
R10
4.7K
SHEET 5
SHEET 4
OFF
NOTE: U22 AND U23 ARE BIASED BY IBIAS
A/D SUPPLIES
5VAC
DISPLAY SUPPLIES
2
3
1
4
8
6
5
7
4
8
100V
1/4W
VLOAD
VEE
FIL2
FIL1
VEE
4
8
7
6
1
3
2
U22
8
9
10
11
12
13
6
5
4
3
2
1
U22
U23
1213
U23
1011
1/4W
1
1
50V
RI
50V
RI
12
11
10
8
7
6
5
4
3
2
1
50V
50V
U23 U23 U23 U23
IBIAS
DCL
98654321
DCH
VPF
1%
1%
1%
100V
1
2
3
50V
35V 35V
16V
16V
VDDR
50V
VDD
7
6
9
4
5
63V
1%1%
1
10
8
SHLD
RCOM
50V
VSS
1%
10V
9
2
7
4
50V
1%
5
4
3
2
1
25V
35V 1%
2635A-1001
(1 of 5)
Figure 8-2. A1 Main PCA (2635A) (cont)
s75f.eps