Version 4
SHEET 1 880 680
WIRE 288 48 144 48
WIRE 144 80 144 48
WIRE 192 80 144 80
WIRE 288 96 288 48
WIRE 288 96 256 96
WIRE 352 96 288 96
WIRE 480 96 352 96
WIRE 592 96 560 96
WIRE 656 96 592 96
WIRE -176 112 -208 112
WIRE -112 112 -176 112
WIRE 0 112 -32 112
WIRE 192 112 0 112
WIRE -208 128 -208 112
WIRE 0 144 0 112
WIRE 592 144 592 96
WIRE -208 240 -208 208
WIRE 0 240 0 224
WIRE 0 240 -208 240
WIRE 592 240 592 224
WIRE 592 240 0 240
WIRE 656 240 592 240
WIRE 656 256 656 240
FLAG 656 256 0
FLAG 656 96 Vc
FLAG 352 96 Vb
FLAG -176 112 Va
SYMBOL Opamps\\opamp 224 32 R0
WINDOW 0 0 32 Invisible 0
SYMATTR InstName U1
SYMBOL voltage -208 112 R0
WINDOW 0 24 16 Invisible 0
WINDOW 3 -97 150 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value SINE(0 3V 1kHz)
SYMBOL res -16 96 R90
WINDOW 0 0 56 Invisible 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 1K
SYMBOL res -16 240 M180
WINDOW 0 36 76 Invisible 0
WINDOW 3 42 54 Left 0
SYMATTR InstName R2
SYMATTR Value 2K
SYMBOL res 576 80 R90
WINDOW 0 0 56 Invisible 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R3
SYMATTR Value 1K
SYMBOL res 576 240 M180
WINDOW 0 36 76 Invisible 0
WINDOW 3 40 57 Left 0
SYMATTR InstName R4
SYMATTR Value 2K
TEXT -296 360 Left 0 !.tran 20ms
TEXT -296 400 Left 0 !.lib opamp.sub