Version 4
SHEET 1 1240 680
WIRE 304 -64 64 -64
WIRE 432 -64 304 -64
WIRE 64 -48 64 -64
WIRE 304 -48 304 -64
WIRE 432 -16 432 -64
WIRE 208 48 128 48
WIRE 304 48 304 32
WIRE 304 48 208 48
WIRE -64 64 -528 64
WIRE -528 80 -528 64
WIRE -64 80 -64 64
WIRE 64 80 64 32
WIRE 128 80 128 48
WIRE 208 80 208 48
WIRE 368 128 368 112
WIRE 304 144 304 48
WIRE 336 144 304 144
WIRE 208 160 208 144
WIRE 432 160 432 48
WIRE 432 160 400 160
WIRE -528 176 -528 160
WIRE 336 176 304 176
WIRE 368 208 368 192
WIRE -64 288 -64 272
WIRE 128 288 128 272
WIRE 400 304 400 288
WIRE 64 320 64 272
WIRE 304 320 304 176
WIRE 304 320 64 320
WIRE 64 336 64 320
WIRE -64 384 -64 352
WIRE 400 400 400 384
WIRE 64 432 64 416
FLAG 400 288 +V
FLAG 400 400 0
FLAG 368 112 0
FLAG 368 208 +V
FLAG 64 -64 OUT
FLAG 208 160 0
FLAG -528 176 0
FLAG -64 384 0
FLAG 64 432 0
FLAG 128 288 0
SYMBOL res 288 -64 R0
SYMATTR InstName R1
SYMATTR Value 70K
SYMBOL res 48 320 R0
WINDOW 3 25 81 Left 2
SYMATTR Value 120
SYMATTR InstName R2
SYMBOL voltage 400 288 R0
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL diode -80 288 R0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL diode 416 48 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL cap 192 80 R0
SYMATTR InstName C2
SYMATTR Value .022µ
SYMBOL voltage -528 64 R0
SYMATTR InstName V2
SYMATTR Value pulse(0 10 0 1 1 500 1000)
SYMBOL res 48 -64 R0
SYMATTR Value {R}
SYMATTR InstName R3
SYMBOL References\\LTZ1000A 32 176 R0
WINDOW 3 123 109 Left 2
SYMATTR InstName U1
SYMBOL opamps\\LT1006 368 224 M180
WINDOW 0 21 91 Left 2
WINDOW 3 22 41 Left 2
SYMATTR InstName U2
TEXT -576 376 Left 2 !.tran 0 3000 10 startup\n.step param R list 50 100 150\n.options numdgt=15 measdgt=10 plotwinsize=0