Version 4
SHEET 1 880 680
WIRE 304 48 224 48
WIRE 288 128 176 128
WIRE 224 144 224 48
WIRE 176 160 176 128
WIRE 192 160 176 160
WIRE 288 176 288 128
WIRE 288 176 256 176
WIRE 336 176 288 176
WIRE 192 192 96 192
WIRE 304 208 304 128
WIRE 304 208 224 208
WIRE 208 272 96 272
WIRE 336 272 336 256
WIRE 336 272 208 272
FLAG 208 272 0
SYMBOL voltage 96 176 R0
WINDOW 3 -109 -19 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value SINE(10 10 100)
SYMATTR InstName V1
SYMBOL res 320 160 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL voltage 304 32 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 30
SYMBOL Opamps\\eigene\\TL074 224 112 R0
SYMATTR InstName U1
TEXT 48 72 Left 2 !.tran 20m