12V
1k
10k
10k
1k
1M
5V
100k
R210M
R110M
IC1AMAX4477 IC1B
MAX4477
C14.7 pF
0.1 �F1000 pF
100 pF0.1 �F
0.1 �F
0.1 �F
0.01 �F
PINDIODE
–
+–
+
GAMMARADIATION
5V
IC2AMAX4477
100 pF
0.1 �F0.01 �F–
+
5V
28
36
52
1
4
4
1
18
3
IC3MAX987
0.1 �F
–
+
5V
4
5
2
3
7
1k
10k
150k
10k
IC2BMAX4477
0.01 �F
100 pF
–
+
6
57
VOUT
TEST POINT 1
F igure 1
When a single gamma photon with sufficient energy strikes the PIN photodiode in this circuit, the output of the com-parator pulses high.
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