Version 4
SHEET 1 880 756
WIRE 272 112 272 80
WIRE 240 128 160 128
WIRE 368 144 304 144
WIRE 528 144 368 144
WIRE -336 160 -336 128
WIRE -208 160 -208 128
WIRE -96 160 -96 128
WIRE 16 160 16 128
WIRE 240 160 224 160
WIRE 368 176 368 144
WIRE 528 192 528 144
WIRE 272 208 272 176
WIRE -336 272 -336 240
WIRE -208 272 -208 240
WIRE -96 272 -96 240
WIRE 16 272 16 240
WIRE 160 288 160 128
WIRE 368 288 368 256
WIRE 368 288 160 288
WIRE 368 304 368 288
WIRE 528 304 528 272
WIRE 240 464 240 416
WIRE -16 480 -64 480
WIRE 96 480 64 480
WIRE 208 480 96 480
WIRE 368 496 368 384
WIRE 368 496 272 496
WIRE 208 512 176 512
WIRE -336 560 -336 528
WIRE 240 576 240 528
WIRE 96 656 96 480
WIRE 96 656 80 656
WIRE 208 656 96 656
WIRE 368 656 368 496
WIRE 368 656 288 656
WIRE -336 672 -336 640
FLAG 272 208 0
FLAG 272 80 48v
FLAG 224 160 Vref
FLAG 528 304 0
FLAG -208 272 0
FLAG -336 272 0
FLAG -336 128 Vref
FLAG -208 128 48v
FLAG 528 144 Vout
FLAG -64 480 Vc
FLAG -96 272 0
FLAG -96 128 Vref2
FLAG 176 512 Vref2
FLAG 16 272 0
FLAG 16 128 3v3
FLAG 240 416 3v3
FLAG -336 528 Vc
FLAG -336 672 0
FLAG 240 576 0
SYMBOL Opamps\\UniversalOpamp2 272 144 R0
SYMATTR InstName U1
SYMBOL res 352 160 R0
SYMATTR InstName R1
SYMATTR Value 590k
SYMBOL res 352 288 R0
SYMATTR InstName R2
SYMATTR Value 3770
SYMBOL res 512 176 R0
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL voltage -336 144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 0.75
SYMBOL voltage -208 144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 48
SYMBOL res 80 464 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 22k
SYMBOL voltage -336 544 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 124 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(0 1.8 0.1 0.5 0.5 0.2)
SYMBOL res 304 640 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 3900
SYMBOL voltage -96 144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value 0.65
SYMBOL voltage 16 144 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V5
SYMATTR Value 3.3
SYMBOL Opamps\\UniversalOpamp2 240 496 R0
SYMATTR InstName U2
TEXT -360 400 Left 2 !.tran 1.5s