Version 4
SHEET 1 1492 1032
WIRE -752 304 -768 304
WIRE -608 304 -752 304
WIRE -512 304 -528 304
WIRE -416 304 -432 304
WIRE -256 304 -336 304
WIRE -256 368 -256 304
WIRE -208 368 -256 368
WIRE 288 368 -16 368
WIRE 288 400 288 368
WIRE -768 416 -768 304
WIRE -208 464 -304 464
WIRE 16 464 -16 464
WIRE 288 512 288 480
WIRE -768 528 -768 496
WIRE -304 624 -304 464
WIRE -208 624 -304 624
WIRE 16 624 16 464
WIRE 16 624 -16 624
WIRE 256 624 16 624
WIRE 320 624 256 624
WIRE 256 656 256 624
WIRE -256 720 -256 368
WIRE -208 720 -256 720
WIRE 16 720 -16 720
WIRE -304 768 -304 624
WIRE 16 768 16 720
WIRE 256 768 256 720
FLAG -768 528 0
FLAG -304 768 0
FLAG 16 768 0
FLAG 288 512 0
FLAG 320 624 TRIG
FLAG 256 768 0
FLAG -752 304 IN
SYMBOL voltage -768 400 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value SINE(0 {230*sqrt(2)} 50)
SYMBOL res -624 320 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value {R_1}
SYMBOL res -528 320 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value {R_1}
SYMBOL res -432 320 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value {R_1}
SYMBOL Optos\\PC817A -112 416 R0
SYMATTR InstName U1
SYMBOL Optos\\PC817A -112 672 R0
SYMATTR InstName U2
SYMBOL voltage 288 384 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL cap 240 656 R0
SYMATTR InstName C_pin
SYMATTR Value 10p
TEXT -528 232 Left 2 !.param R_1=100K/3
TEXT -794 224 Left 2 !.tran 40m