−
−
GND
+
+
+9 V
−
−
+
+
1
1
5
5
10
10
15
15
20
20
25
25
30
30
35
35
40
40
45
45
50
50
55
55
60
60
j
j
i
i
h
h
g
g
f
f
e
e
d
d
c
c
b
b
a
a
R1 · 10 kΩ
R2 · 10 kΩ
R1 · 10 kΩ
R2 · 10 kΩ
11
11
12
12
16
16
21
21
e
e
f
f
g
g
h
h
j
j
+9 V
GND
MODEL · DC simulation
450 µA
450 µA
9 V
9 V
4.5 V
0 V
0 V
4.5 V
−
+
−
+
−
+
−
+
−
+
−
+
−
−
GND
+
+
+9 V
−
−
+
+
1
1
5
5
10
10
15
15
20
20
25
25
30
30
35
35
40
40
45
45
50
50
55
55
60
60
j
j
i
i
h
h
g
g
f
f
e
e
d
d
c
c
b
b
a
a
R2 · 10 kΩ
R1 · 10 kΩ
R1 · 10 kΩ
R2 · 10 kΩ
11
11
12
12
16
16
21
21
e
e
f
f
g
g
h
h
j
j
+9 V
GND
MODEL · DC simulation
450 µA
450 µA
9 V
9 V
4.5 V
0 V
0 V
4.5 V
−
+
−
+
−
+
−
+
−
+
−
+
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