Version 4
SHEET 1 1132 680
WIRE 416 -48 144 -48
WIRE 416 -16 416 -48
WIRE 1008 16 672 16
WIRE 672 96 672 16
WIRE 816 96 672 96
WIRE 144 112 144 -48
WIRE 112 128 -176 128
WIRE 416 128 416 64
WIRE 528 128 416 128
WIRE 288 144 176 144
WIRE 112 160 -48 160
WIRE 528 160 528 128
WIRE 672 160 672 96
WIRE 288 176 288 144
WIRE 816 176 816 96
WIRE 1008 176 1008 16
WIRE 416 208 416 128
WIRE -176 224 -176 128
WIRE -48 224 -48 160
WIRE 672 288 672 240
WIRE 816 288 816 240
WIRE 816 288 672 288
WIRE -112 304 -176 304
WIRE -48 304 -112 304
WIRE 144 336 144 176
WIRE 416 336 416 288
WIRE 416 336 144 336
WIRE -112 352 -112 304
WIRE 672 352 672 288
WIRE 288 432 288 256
WIRE 624 432 288 432
WIRE 288 464 288 432
WIRE 672 480 672 448
WIRE 1008 480 1008 256
WIRE 1008 480 672 480
WIRE 1024 480 1008 480
WIRE 1024 528 1024 480
WIRE 288 640 288 544
FLAG 528 160 0
FLAG -112 352 0
FLAG 288 640 0
FLAG 1024 528 0
SYMBOL voltage 416 -32 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage 416 192 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL voltage -48 208 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 0
SYMBOL voltage -176 208 R0
WINDOW 0 -84 23 Left 2
WINDOW 3 -123 91 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value 563.383
SYMBOL res 272 160 R0
SYMATTR InstName R1
SYMATTR Value 20k
SYMBOL Opamps\\LT1001 144 80 R0
SYMATTR InstName U1
SYMBOL nmos 624 352 R0
SYMATTR InstName M1
SYMBOL res 656 144 R0
SYMATTR InstName R2
SYMATTR Value 20k
SYMBOL diode 832 240 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMBOL voltage 1008 160 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V5
SYMATTR Value 563.383
SYMBOL res 272 448 R0
SYMATTR InstName R3
SYMATTR Value 20k
TEXT -300 376 Left 2 !;tran 0 200ms 0 10ms
TEXT -16 360 Left 2 !.dc V3 500 650 10