Version 4 SHEET 1 1036 680 WIRE -160 64 -240 64 WIRE -144 64 -160 64 WIRE -32 64 -64 64 WIRE 80 64 -32 64 WIRE 176 64 80 64 WIRE 304 64 272 64 WIRE 320 64 304 64 WIRE 416 64 400 64 WIRE -32 80 -32 64 WIRE 416 96 416 64 WIRE 384 112 384 96 WIRE -240 128 -240 64 WIRE -32 176 -32 160 WIRE 32 176 -32 176 WIRE 304 176 304 64 WIRE 304 176 112 176 WIRE -32 192 -32 176 WIRE 416 224 416 176 WIRE 192 240 192 112 WIRE -240 256 -240 208 WIRE -160 256 -160 64 WIRE -80 256 -160 256 WIRE 32 256 16 256 WIRE 144 256 112 256 WIRE 192 256 192 240 WIRE 192 256 144 256 WIRE 144 288 144 256 WIRE 192 288 192 256 WIRE 336 288 336 112 WIRE 480 288 336 288 WIRE 480 304 480 288 WIRE 144 368 144 352 WIRE 192 384 192 368 WIRE 480 400 480 384 FLAG 416 224 0 FLAG -240 256 0 FLAG -240 64 in FLAG 192 384 0 FLAG 416 64 Out FLAG 192 240 G FLAG 80 64 s FLAG -32 176 B FLAG 480 400 0 FLAG 384 112 0 FLAG 480 288 Reset FLAG 144 368 0 SYMBOL res -48 48 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 31 54 VTop 2 SYMATTR InstName R1 SYMATTR Value .6 SYMBOL voltage -240 112 R0 WINDOW 3 -61 100 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value {V} SYMATTR InstName V1 SYMBOL res 176 384 M180 WINDOW 0 36 76 Left 2 WINDOW 3 36 40 Left 2 SYMATTR InstName R2 SYMATTR Value 50k SYMBOL pmos 272 112 M270 WINDOW 0 -12 54 VLeft 2 WINDOW 3 69 100 VLeft 2 SYMATTR InstName M1 SYMATTR Value FDS6675 SYMBOL pnp 16 192 R90 WINDOW 0 50 31 VRight 2 WINDOW 3 83 10 VRight 2 SYMATTR InstName Q1 SYMATTR Value 2N3906 SYMBOL res 400 80 R0 WINDOW 3 35 84 Left 2 SYMATTR Value R=abs(30-(time*10)) SYMATTR InstName Rld SYMBOL res -48 64 R0 SYMATTR InstName R5 SYMATTR Value 1k SYMBOL res 128 160 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 5k SYMBOL res 128 240 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 1k SYMBOL sw 304 64 R270 WINDOW 0 65 14 VRight 2 WINDOW 3 92 36 VRight 2 SYMATTR InstName SReset SYMBOL voltage 480 288 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value PULSE(-1 1 6 .1ms 0 .1) SYMBOL cap 160 288 M0 SYMATTR InstName C1 SYMATTR Value .1µF TEXT -88 472 Left 2 !.tran 0 7 .1ms startup TEXT -176 8 Left 2 ;R1 Pwr = 0.6V * I Limit TEXT 208 472 Left 2 !.model SW SW(Ron=.1 Roff=10Meg Vt=0 Vh=-.5) TEXT 536 64 Left 3 ;Simulation Only TEXT -304 320 Left 2 !.step param V list 20 5 TEXT -144 384 Left 2 ;C1 optional \nto prevent nuisance tripping RECTANGLE Normal 896 432 320 16 1