LM211, LM311
V
EE
V
CC
= +15 V
Balance
Adjust
Balance
Input
Inputs
3.0 k
Inputs
5.0 k
+
LM311
V
EE
V
EE
= -15 V
V
CC
Gnd
10 k
Gnd
Output
to CMOS Logic
V
EE
+
LM311
V
CC1
V
CC
Output
Balance/Strobe
2N2222 or
Q1
Equivalent
1.0 k
TTL
Strobe
*D1
*Zener Diode D1
protects the comparator
from inductive kickback
and voltage transients
on the V
CC2
supply line.
V
CC2
Figure 18. Zero–Crossing Detector
Driving CMOS Logic
Figure 19. Relay Driver with Strobe Capability
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