Version 4
SHEET 1 880 680
WIRE -160 -16 -416 -16
WIRE 224 -16 -160 -16
WIRE 224 32 224 -16
WIRE -160 144 -160 -16
WIRE -192 160 -224 160
WIRE -80 176 -128 176
WIRE -48 176 -80 176
WIRE 224 176 224 96
WIRE -192 192 -304 192
WIRE -80 224 -80 176
WIRE -48 256 -48 176
WIRE 176 256 -48 256
WIRE -224 320 -224 160
WIRE -80 320 -80 288
WIRE -80 320 -224 320
WIRE 32 320 -80 320
WIRE 224 320 224 272
WIRE 224 320 112 320
WIRE -416 352 -416 -16
WIRE -304 352 -304 192
WIRE 224 352 224 320
WIRE -416 464 -416 432
WIRE -304 464 -304 432
WIRE -160 464 -160 208
WIRE 224 464 224 432
FLAG -160 464 0
FLAG -416 464 0
FLAG -304 464 0
FLAG 224 464 0
SYMBOL res 128 304 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 208 336 R0
SYMATTR InstName R2
SYMATTR Value 0.5
SYMBOL voltage -304 336 R0
WINDOW 3 57 -125 VRight 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value 1
SYMATTR InstName V1
SYMBOL voltage -416 336 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 10V
SYMBOL cap -96 224 R0
SYMATTR InstName C1
SYMATTR Value {C1}
SYMBOL Opamps/LT1006 -160 112 R0
SYMATTR InstName U1
SYMBOL nmos 176 176 R0
SYMATTR InstName M1
SYMATTR Value IRF510
SYMBOL LED 208 32 R0
SYMATTR InstName D1
SYMATTR Value W5AP-LZMZ-5K8L
SYMATTR Description Diode
SYMATTR Type diode
TEXT -136 16 Left 2 !.tran 25m startup
TEXT -136 64 Left 2 !.step param C1 list  1n 10n 100n 22p