Version 4
SHEET 1 972 768
WIRE 16 336 -48 336
WIRE 192 336 96 336
WIRE 320 336 192 336
WIRE 432 336 400 336
WIRE 496 368 496 352
WIRE 240 400 240 384
WIRE -272 432 -272 416
WIRE -160 432 -160 416
WIRE -48 432 -48 336
WIRE 192 432 192 336
WIRE 208 432 192 432
WIRE 432 448 432 336
WIRE 432 448 368 448
WIRE 496 448 496 432
WIRE 496 448 432 448
WIRE 208 464 192 464
WIRE 192 496 192 464
WIRE 208 496 192 496
WIRE 432 512 368 512
WIRE 496 512 432 512
WIRE -272 528 -272 512
WIRE -160 528 -160 512
WIRE 208 528 192 528
WIRE 496 528 496 512
WIRE 240 576 240 560
WIRE 496 608 496 592
WIRE -48 624 -48 512
WIRE 16 624 -48 624
WIRE 192 624 192 528
WIRE 192 624 96 624
WIRE 304 624 192 624
WIRE 432 624 432 512
WIRE 432 624 384 624
FLAG -272 528 0
FLAG -160 528 0
FLAG -272 416 +V
FLAG -160 416 -V
FLAG 496 352 0
FLAG 496 608 0
FLAG 240 384 +V
FLAG 240 576 -V
SYMBOL voltage -272 416 R0
WINDOW 123 24 132 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 2.7
SYMBOL voltage -160 416 R0
WINDOW 123 24 132 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 0
SYMBOL voltage -48 416 R0
WINDOW 123 40 100 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(0 0.5 10K)
SYMBOL res 112 320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 30K
SYMBOL res 416 320 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 30K
SYMBOL res 112 608 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 30K
SYMBOL res 400 608 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 30K
SYMBOL cap 480 432 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 8 Left 2
SYMATTR InstName C1
SYMATTR Value 10p
SYMBOL cap 480 528 R0
SYMATTR InstName C2
SYMATTR Value 10p
SYMBOL LTC1992 272 480 R0
SYMATTR InstName U1
TEXT 472 672 Left 2 !.tran 1m