Version 4
SHEET 1 880 680
WIRE 576 -128 576 -160
WIRE 576 -128 272 -128
WIRE 272 -112 272 -128
WIRE 576 -112 576 -128
WIRE 576 -16 576 -32
WIRE 576 -16 368 -16
WIRE 576 0 576 -16
WIRE 272 64 272 -32
WIRE 416 64 272 64
WIRE 528 80 480 80
WIRE 368 96 368 -16
WIRE 416 96 368 96
WIRE 272 128 272 64
WIRE 576 176 576 96
WIRE 112 192 80 192
WIRE 224 208 176 208
WIRE 112 224 -32 224
WIRE -32 240 -32 224
WIRE 80 256 80 192
WIRE 272 256 272 224
WIRE 272 256 80 256
WIRE 576 336 576 256
FLAG -128 240 +30V
FLAG 576 -224 +30V
FLAG 448 48 +30V
FLAG -128 320 0
FLAG -32 320 0
FLAG 272 336 0
FLAG 576 336 0
FLAG 448 112 0
FLAG 144 176 +30V
FLAG 144 240 0
FLAG -32 224 Vin
SYMBOL Opamps\\opamp2 144 144 R0
SYMATTR InstName U1
SYMATTR Value LM358/NS
SYMBOL Opamps\\opamp2 448 16 R0
SYMATTR InstName U2
SYMATTR Value LM358/NS
SYMBOL nmos 224 128 R0
SYMATTR InstName M1
SYMATTR Value 2N7002
SYMBOL res 256 240 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 256 -128 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL res 560 -128 R0
SYMATTR InstName R3
SYMATTR Value 500
SYMBOL zener 592 -160 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value BZX84C3V3
SYMBOL voltage -32 224 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(0 5 .1 1 1 1 4 1)
SYMBOL voltage -128 224 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 30
SYMBOL nmos 528 0 R0
SYMATTR InstName M2
SYMATTR Value 2N7002
SYMBOL res 560 160 R0
SYMATTR InstName R4
SYMATTR Value 500
TEXT 88 40 Left 2 !.include LM358.lib
TEXT -162 352 Left 2 !.tran 0 1.1 .1 startup uic