VDD
R12
C9
VDD
D2
D3
4
LR
R3
R2
U1
U1
6
R1
SW3
5 2
3
LR1
P
C1
AC
LOAD
MAINS
VDD
LS6506R
N
R6
R5
U1
U1
R4
7
10
9
6
7
LR2
C2
U1 = CD4049UB/CD4050B
R1, R4 = 51kW, 1/4W
R2, R5 = 2MWPotentiometer, 1/4W
R3, R6 = 100kW, 1/4W
C1, C2 = 0.01uF, 25V
Note: Connect U1 Pins 11 and 14 to Gnd.
Outputs LR1 and LR2 occur on the negative edge of the AC input at Pin 5 of the LS6506R.
Variable resistors R2 and R5 are adjusted so the relay contact closes and opens at the
at the AC zero-crossover at the Load.
FIGURE 6. Zero-Crossing Adjustment
6506R-012608-10
LSI [ LSI COMPUTER SYSTEMS ]
