Version 4
SHEET 1 1536 680
WIRE -32 -80 -144 -80
WIRE 160 -80 96 -80
WIRE 208 -80 160 -80
WIRE -144 -48 -144 -80
WIRE -32 -48 -32 -80
WIRE 96 -48 96 -80
WIRE 208 -48 208 -80
WIRE 1008 48 832 48
WIRE -144 64 -144 32
WIRE -32 64 -32 32
WIRE 96 64 96 32
WIRE 208 64 208 32
WIRE 1008 80 1008 48
WIRE 832 128 832 48
WIRE 272 144 -144 144
WIRE 480 144 368 144
WIRE 784 144 592 144
WIRE 272 192 96 192
WIRE 480 192 384 192
WIRE 784 192 752 192
WIRE 1008 192 1008 160
WIRE 96 240 96 192
WIRE 592 304 592 144
WIRE 832 304 832 208
WIRE 96 368 96 320
WIRE -144 384 -144 144
WIRE 592 416 592 384
WIRE 832 416 832 384
WIRE -144 496 -144 464
FLAG 832 416 0
FLAG 1008 192 0
FLAG 208 64 0
FLAG 752 192 0
FLAG 96 64 0
FLAG -144 496 0
FLAG 160 -80 IN
FLAG -32 64 0
FLAG -144 64 0
FLAG 96 368 0
FLAG 480 144 1V
FLAG 592 416 0
SYMBOL voltage 208 -64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0 24 0 2m 2m 1n)
SYMBOL voltage 832 288 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 12 0 1n 1n 2u 4u)
SYMBOL res 992 64 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL sw 832 224 M180
SYMATTR InstName S1
SYMATTR Value S15V
SYMBOL res 80 -64 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL bv -144 368 R0
SYMATTR InstName B1
SYMATTR Value V=IF(V(IN)<=15V, 1, 0)
SYMBOL voltage -32 -64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 15
SYMBOL res -160 -64 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL Digital\\srflop 320 96 R0
SYMATTR InstName A1
SYMBOL voltage 96 224 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value PWL(0 1 2m 1 2.000001m 0)
SYMBOL bv 592 288 R0
SYMATTR InstName B2
SYMATTR Value V=V(1V)*16
TEXT -144 544 Left 2 !.tran 4m
TEXT -144 576 Left 2 !.model S15V SW (Ron=1m Roff=1MEG Vt=15V)