−
−
+
+
−
−
+
+
1
1
5
5
10
10
15
15
20
20
25
25
30
30
j
j
i
i
h
h
g
g
f
f
e
e
d
d
c
c
b
b
a
a
R1 · 330 Ω
D1 · red
S1 · SW520D
R1 · 330 Ω
S1 · SW520D
D1 · red
2
2
3
3
6
6
9
9
10
10
11
11
g
g
h
h
i
i
j
j
MODEL · DC simulation
14.7 mA
14.7 mA
0.149 pA
5 V
148 mV
148 mV
0 V
0 V
5 V
−
+
−
+
−
+
−
+
−
+
−
+
−
−
+
+
−
−
+
+
1
1
5
5
10
10
15
15
20
20
25
25
30
30
j
j
i
i
h
h
g
g
f
f
e
e
d
d
c
c
b
b
a
a
D1 · red
R1 · 330 Ω
S1 · SW520D
R1 · 330 Ω
S1 · SW520D
D1 · red
2
2
3
3
6
6
9
9
10
10
11
11
g
g
h
h
i
i
j
j
MODEL · DC simulation
14.7 mA
14.7 mA
0.149 pA
5 V
148 mV
148 mV
0 V
0 V
5 V
−
+
−
+
−
+
−
+
−
+
−
+
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