Version 4
SHEET 1 916 680
WIRE 272 -80 224 -80
WIRE -128 -32 -208 -32
WIRE 128 -32 64 -32
WIRE 224 -32 224 -80
WIRE 400 -32 224 -32
WIRE 560 -32 400 -32
WIRE -656 -16 -704 -16
WIRE 224 0 224 -32
WIRE 400 0 400 -32
WIRE -704 16 -704 -16
WIRE -496 16 -704 16
WIRE -336 16 -416 16
WIRE -320 16 -336 16
WIRE 96 32 64 32
WIRE 560 48 560 -32
WIRE -128 64 -160 64
WIRE -704 80 -704 16
WIRE -336 96 -336 16
WIRE -160 96 -160 64
WIRE -160 96 -336 96
WIRE 224 128 224 80
WIRE 352 128 224 128
WIRE -208 144 -208 -32
WIRE -208 144 -336 144
WIRE -160 144 -160 96
WIRE -128 144 -160 144
WIRE 128 144 128 -32
WIRE 128 144 64 144
WIRE 224 144 224 128
WIRE 224 144 128 144
WIRE -704 208 -704 160
WIRE -496 208 -704 208
WIRE -336 208 -336 144
WIRE -336 208 -416 208
WIRE 96 208 96 32
WIRE 96 208 64 208
WIRE 224 208 96 208
WIRE -336 240 -336 208
WIRE -320 240 -336 240
WIRE -208 240 -208 144
WIRE -128 240 -208 240
WIRE 224 240 224 208
WIRE 400 240 400 192
WIRE 400 240 224 240
WIRE 560 240 560 128
WIRE 560 240 400 240
WIRE 560 256 560 240
WIRE -704 272 -704 208
WIRE -704 368 -704 352
FLAG -704 368 0
FLAG -320 16 TP_A
IOPIN -320 16 BiDir
FLAG 560 256 0
FLAG 352 128 PIC_in
IOPIN 352 128 BiDir
FLAG -656 -16 AC_MAINS
IOPIN -656 -16 BiDir
FLAG -320 240 TP_B
IOPIN -320 240 BiDir
FLAG 272 -80 PIC_5V_SUPPLY
IOPIN 272 -80 BiDir
SYMBOL res -400 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 15k
SYMBOL voltage -704 64 R0
WINDOW 3 -67 181 Left 2
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value SINE(0 340 50)
SYMATTR InstName V1
SYMBOL voltage 560 32 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL res 208 -16 R0
SYMATTR InstName R2
SYMATTR Value 5k
SYMBOL res -720 256 R0
SYMATTR InstName R3
SYMATTR Value .1
SYMBOL res -400 192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 15k
SYMBOL Optos\\4N25 -32 32 R0
SYMATTR InstName U1
SYMBOL Optos\\4N25 -32 208 R0
SYMATTR InstName U2
TEXT -760 -56 Left 4 ;240VAC 50Hz
TEXT -664 368 Left 2 !.tran 50m
TEXT 376 40 Left 4 ;PIC
TEXT -480 72 Left 2 ;<1W\ndissipation
TEXT -656 320 Left 2 ;earth only here\n to make sim run
TEXT 264 320 Left 2 ;File name:back to back  ZCD_opto\nDate: 02/01/23\nDrawn: KWK
TEXT -488 256 Left 2 ;<1W\ndissipation
RECTANGLE Normal 464 192 336 0
RECTANGLE Normal 640 432 -800 -240