Version 4 SHEET 1 880 680 WIRE 432 0 320 0 WIRE 320 16 320 0 WIRE 320 112 320 96 WIRE 432 144 432 0 WIRE -16 192 -48 192 WIRE 64 192 48 192 WIRE 80 192 64 192 WIRE 176 192 144 192 WIRE 240 192 176 192 WIRE 272 192 240 192 WIRE -48 208 -48 192 WIRE 64 208 64 192 WIRE 176 208 176 192 WIRE 240 208 240 192 WIRE -48 304 -48 288 WIRE 64 304 64 272 WIRE 64 304 -48 304 WIRE 176 304 176 288 WIRE 176 304 64 304 WIRE 240 304 240 272 WIRE 240 304 176 304 WIRE 320 304 320 208 WIRE 320 304 240 304 WIRE 432 304 432 224 WIRE 432 304 320 304 WIRE -48 320 -48 304 FLAG -48 320 0 FLAG -48 192 Vsensor FLAG 240 192 Vgate SYMBOL nmos 272 112 R0 SYMATTR InstName M1 SYMATTR Value FDS6912 SYMBOL diode 80 208 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode 80 272 R180 WINDOW 0 24 64 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D2 SYMATTR Value 1N4148 SYMBOL res 160 192 R0 SYMATTR InstName R1 SYMATTR Value 500k SYMBOL cap 48 176 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 10µF SYMBOL voltage -48 192 R0 WINDOW 3 13 121 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value PULSE(0 5 100ms 0 0 100ms 200ms 5) SYMBOL res 304 0 R0 SYMATTR InstName R2 SYMATTR Value 100 SYMBOL voltage 432 128 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value 5V SYMBOL cap 224 208 R0 SYMATTR InstName C2 SYMATTR Value 470nF TEXT -82 336 Left 2 !.tran 2s