
+ 5V
4
16 11
15
Nvs
1
R41
250K
2
R42
10K
VN
5V
t
TP7
O
+5V
RESET
S2o
+5V
+
5V
R6
10K
TP6
1
101
9
1T
81
R5
10K
Q2
2N3904
TP4
CLK A
R10
R1
10K
10K
TEMPERATURE
PRESSURE
FORCE
VELOCITY
LIGHT
INTENSITY
/
THERMOCOUPII
BELLOWS
STRAIN
GAGE TACHOMETER
PHOTOCELL
TRANSDUCERS
TP1
o
1
RESET
0 0-
+
Sl
Cl
22µF
-40
D1 14
1N914
0
1N912
4
10
S3
TEST
INPUT
0-5V
MAXIDC)
13
12
-9.1-8-
8
3
ICI
LM324
11
1
R2
10011
+ 5V
1
R3
10K
5V
-o-
R7
1K
RB
10K
2 1
102
IC2
555
GU1
7
10µF
+
5V
5
61
11
Q1
2N3906
TP3
+5V
O
14
C3
01µf
O
TP2
1C3
4066
4
13
R9
10K
7
15 10 9
IC4
74193
B C
3
R12
'10K
2
:R13
10K
R14
10K
7 12
14
R15
TP5
10K
R2R LADDER
IC5
74193
CLK A
B
C
J
3
R17 I
10K ¡
2
R18.
10K
i
6
R19.
10K:
TPB
' O
IC6
74190
CLK
3 2
2
6
6
7
1114
5
8
1 13
5V
IC9
7446
$ R20
1'3301!
10 11
12
13
R22 $
R24
330117R23 1'33011
0
3300 13
All
330117
DISP
3
a
' 'b
14
1 lE R25
11
3301!
2
15
+
5V
6
$ R26
33011
+
5V
IC7
14190
CLK
TP9
O
1
2
6
IC10
7446
9
R27
3301!
10 11
R29
$
330111
R30
10
33011
13
9
ib
lc
12 13
14
R31
3301!
R28
S
3301!
DISP 2
1
R32
11
3301!
I3
114
J
bV
15
+
5V
16
S R33
} 33011
151
10
91
CLK
ICB
74193
3
1
2
2
6
6
7
1
i
4
I5
18
+
5V
16I 8
IC11
7446
R34
ss
33011
i
10
11
R36
3301!
R37
0
3301!
12 13
15
R38
33011
R
3301!
35 $
DISP
1
3
a
R39
3301!
40
2
11
b
R
33011
i d
'c +5V
3
14 I
FIG. 3 -THE
CIRCUITRY
CONSISTS
OF COMMON
TTL,
CMOS.
AND OP -AMP ICS. When
switch S3 is in the test position, varying R41
simulates a
transducer's voltage output.
increases until it reaches a point
slightly above the
voltage
of the peak
detector; at that instant, the com-
parator output swings low, which dis-
ables the bilateral switch
and
stops
the counters.
If everything functions
properly,
the number
displayed on the 7 -seg-
ment LED's
will
represent a
value
equivalent to the transducer's output.
Note
that the display's
reading is not
an actual
voltage
reading, but
simply
61
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