Version 4
SHEET 1 1124 736
WIRE 496 -32 448 -32
WIRE 656 -32 576 -32
WIRE 448 0 448 -32
WIRE 992 48 576 48
WIRE 1008 48 992 48
WIRE 320 80 192 80
WIRE 320 96 320 80
WIRE 448 96 448 80
WIRE 448 112 448 96
WIRE 496 112 448 112
WIRE 512 112 496 112
WIRE 576 112 576 48
WIRE 656 112 656 -32
WIRE 1008 112 1008 48
WIRE 192 160 192 80
WIRE 496 160 496 112
WIRE 544 160 496 160
WIRE 160 176 -240 176
WIRE 400 192 224 192
WIRE -240 208 -240 176
WIRE 160 208 112 208
WIRE 320 208 320 176
WIRE 368 208 320 208
WIRE 480 208 448 208
WIRE 192 288 192 224
WIRE 368 288 192 288
WIRE -240 304 -240 288
WIRE -96 304 -96 288
WIRE -96 304 -240 304
WIRE 304 304 -96 304
WIRE 320 304 320 208
WIRE 320 304 304 304
WIRE 480 304 480 288
WIRE 480 304 320 304
WIRE 656 304 656 192
WIRE 656 304 480 304
WIRE 304 320 304 304
WIRE 656 336 656 304
WIRE 1008 336 1008 192
WIRE 1008 336 656 336
WIRE 544 352 544 160
WIRE 112 464 112 208
WIRE 544 464 544 432
WIRE 544 464 112 464
WIRE 544 496 544 464
WIRE 544 608 544 576
FLAG 304 320 0
FLAG 448 96 out
FLAG 992 48 ac
FLAG 544 608 0
SYMBOL nmos 400 112 R0
SYMATTR InstName M1
SYMATTR Value IPB65R420CFD
SYMBOL res 432 -16 R0
WINDOW 3 70 40 Left 2
SYMATTR Value 20000
SYMATTR InstName R1
SYMBOL voltage 656 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 600
SYMBOL voltage 320 80 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL voltage -240 192 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(1.2 1.1 50)
SYMBOL voltage 368 192 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value 12
SYMBOL Opamps\\LT1001 192 128 R0
SYMATTR InstName U1
SYMBOL cap 576 96 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL res 992 96 R0
SYMATTR InstName R5
SYMATTR Value 4.7Meg
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 464 192 R0
SYMATTR InstName R4
SYMATTR Value 200
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 528 336 R0
SYMATTR InstName R6
SYMATTR Value 3.0Meg
SYMATTR SpiceLine tol=0 pwr=0.1
SYMBOL res 528 480 R0
SYMATTR InstName R7
SYMATTR Value 12K
SYMATTR SpiceLine tol=0 pwr=0.1
SYMBOL ind 592 -48 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L1
SYMATTR Value 100µ
TEXT -272 344 Left 2 !.tran 0 1 0 0.00001