Version 4
SHEET 1 880 680
WIRE -80 0 -240 0
WIRE 16 0 -16 0
WIRE 416 0 416 -48
WIRE 416 0 16 0
WIRE 672 0 416 0
WIRE -240 16 -240 0
WIRE 16 96 16 64
WIRE 16 96 -240 96
WIRE 128 96 16 96
WIRE 416 96 416 0
WIRE 416 96 352 96
WIRE 672 96 672 80
WIRE 672 96 608 96
WIRE 16 112 16 96
WIRE 672 112 672 96
WIRE 128 160 -32 160
WIRE 608 160 608 96
WIRE 608 160 352 160
WIRE 128 224 -192 224
WIRE 512 224 352 224
WIRE 672 224 672 192
WIRE 672 224 512 224
WIRE -192 256 -192 224
WIRE -160 256 -192 256
WIRE 128 288 96 288
WIRE 416 288 352 288
WIRE 512 288 512 224
WIRE 416 368 416 352
WIRE 512 368 512 352
WIRE -32 432 -32 160
WIRE 672 432 672 224
WIRE 672 432 -32 432
FLAG 16 112 0
FLAG 512 368 0
FLAG 416 368 0
FLAG 416 -48 Vcc
IOPIN 416 -48 In
FLAG 96 288 Vcc
IOPIN 96 288 In
FLAG -160 256 out
IOPIN -160 256 Out
SYMBOL Misc\\NE555 240 192 R0
SYMATTR InstName U1
SYMBOL cap 0 0 R0
SYMATTR InstName C1
SYMATTR Value 100e-6
SYMBOL Misc\\battery -240 0 R0
WINDOW 3 -62 53 Left 2
WINDOW 123 0 0 Left 0
WINDOW 39 -138 9 Left 2
SYMATTR Value 6
SYMATTR SpiceLine Rser=100
SYMATTR InstName V1
SYMBOL cap 400 288 R0
SYMATTR InstName C2
SYMATTR Value 0.01e-6
SYMBOL cap 496 288 R0
SYMATTR InstName C3
SYMATTR Value 1e-6
SYMBOL res 656 -16 R0
SYMATTR InstName R1
SYMATTR Value 8k2
SYMBOL res 656 96 R0
SYMATTR InstName R2
SYMATTR Value 680
SYMBOL diode -80 16 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
TEXT 312 472 Left 2 ;Timing. Need 6ms high, 0.5ms low
TEXT -312 496 Left 2 !.tran 0.1 startup
TEXT -72 528 Left 2 ;This circuit simulates the safety photocells on late model garage door openers.
TEXT -232 -24 Left 2 ;Grey
TEXT -232 112 Left 2 ;White
TEXT -400 -136 Left 2 ;PC terminals
TEXT -400 -112 Left 2 ;on motor box
TEXT -192 -208 Left 2 ;Note: out is connected to Grey line (dashed line). Simulation wont run
TEXT 568 -208 Left 2 ;with link in place.
LINE Normal -80 224 -80 224 2
LINE Normal -96 224 -96 0 2
RECTANGLE Normal -112 144 -416 -80 2