Version 4 SHEET 1 880 680 WIRE -112 0 -144 0 WIRE -64 0 -112 0 WIRE 64 0 -64 0 WIRE 208 0 64 0 WIRE 336 0 288 0 WIRE 400 0 336 0 WIRE 528 0 496 0 WIRE 544 0 528 0 WIRE -144 16 -144 0 WIRE 64 16 64 0 WIRE 528 16 528 0 WIRE 176 64 112 64 WIRE 176 80 176 64 WIRE 336 80 336 0 WIRE 528 112 528 96 WIRE -64 128 -64 0 WIRE -32 128 -64 128 WIRE 256 128 240 128 WIRE 272 128 256 128 WIRE -64 144 -64 128 WIRE -32 176 -32 128 WIRE 256 208 256 128 WIRE 336 208 336 176 WIRE 336 208 256 208 WIRE 176 224 176 176 WIRE 416 224 416 48 WIRE 416 224 176 224 WIRE -64 240 -64 208 WIRE -32 240 -64 240 WIRE 64 240 64 96 WIRE 64 240 48 240 WIRE 176 240 176 224 WIRE 336 240 336 208 WIRE -64 256 -64 240 WIRE 176 336 176 320 WIRE 336 336 336 320 WIRE -64 352 -64 336 FLAG -64 352 0 FLAG 528 112 0 FLAG 544 0 Out IOPIN 544 0 Out FLAG -144 96 0 FLAG -112 0 V+ FLAG 176 336 0 FLAG 336 336 0 SYMBOL pmos 496 48 M270 WINDOW 0 -11 52 VLeft 2 WINDOW 3 66 83 VLeft 2 SYMATTR InstName M1 SYMATTR Value FDR840P SYMBOL res 304 -16 R90 WINDOW 0 -22 52 VBottom 2 WINDOW 3 -21 51 VTop 2 SYMATTR InstName RLim SYMATTR Value 50m SYMBOL res 512 0 R0 SYMATTR InstName RLoad SYMATTR Value R=.1 + TIME*4000 SYMBOL res -80 240 R0 SYMATTR InstName R3 SYMATTR Value 604 SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL pot 48 0 R0 WINDOW 3 107 -23 Right 2 SYMATTR Value Rtot=100 wiper={W} SYMATTR InstName U3 SYMBOL battery -144 0 R0 WINDOW 3 24 79 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value 15V SYMATTR InstName V1 SYMBOL res 64 224 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 2.61K SYMATTR SpiceLine tol=1 pwr=0.1 SYMBOL References\\tl431a -48 144 M0 SYMATTR InstName U2 SYMBOL pnp 240 176 R180 WINDOW 0 49 28 Left 2 WINDOW 3 25 53 Left 2 SYMATTR InstName Q1 SYMATTR Value 2N3906 SYMBOL pnp 272 176 M180 WINDOW 0 49 28 Left 2 WINDOW 3 25 54 Left 2 SYMATTR InstName Q2 SYMATTR Value 2N3906 SYMBOL res 160 224 R0 SYMATTR InstName R1 SYMATTR Value 100K SYMBOL res 320 224 R0 SYMATTR InstName R2 SYMATTR Value 100K TEXT -16 -48 Left 2 !.step param w 0 1 .25 TEXT 0 328 Left 2 !.tran 10ms TEXT 192 56 Left 2 ;DMMT3906W\nDual Matched TEXT 8 56 Left 2 ;100 TEXT -264 136 Left 2 ;.param W=0 RECTANGLE Normal 144 48 144 48 2 RECTANGLE Normal 368 192 144 32 1