Version 4
SHEET 1 880 680
WIRE -64 -64 -112 -64
WIRE 64 -64 16 -64
WIRE 112 -64 64 -64
WIRE 240 -64 192 -64
WIRE -112 0 -112 -64
WIRE -112 0 -224 0
WIRE -224 32 -224 0
WIRE 64 32 64 -64
WIRE 112 32 64 32
WIRE 240 48 240 -64
WIRE 240 48 176 48
WIRE 288 48 240 48
WIRE -112 64 -112 0
WIRE -64 64 -112 64
WIRE 64 64 16 64
WIRE 112 64 64 64
WIRE 64 112 64 64
WIRE 272 128 128 128
WIRE -224 160 -224 112
WIRE 128 192 128 128
WIRE 160 192 128 192
WIRE 272 208 272 128
WIRE 272 208 224 208
WIRE 64 224 64 176
WIRE 160 224 64 224
WIRE 64 256 64 224
WIRE 64 368 64 336
WIRE 144 368 64 368
WIRE 272 368 272 208
WIRE 272 368 208 368
WIRE 64 400 64 368
WIRE 64 512 64 480
FLAG 64 512 0
FLAG -224 160 0
FLAG -224 0 in
FLAG 288 48 out
SYMBOL Opamps\\opamp 144 -16 R0
SYMATTR InstName U1
SYMBOL Opamps\\opamp 192 144 R0
SYMATTR InstName U2
SYMBOL Misc\\EuropeanResistor 48 240 R0
SYMATTR InstName R4
SYMATTR Value 50k
SYMBOL Misc\\EuropeanResistor 48 384 R0
SYMATTR InstName R5
SYMATTR Value 50k
SYMBOL Misc\\EuropeanResistor 96 -48 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL Misc\\EuropeanResistor -80 -48 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL Misc\\EuropeanResistor -80 80 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 100k
SYMBOL cap 48 112 R0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL cap 144 384 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C2
SYMATTR Value 10n
SYMBOL voltage -224 16 R0
SYMATTR InstName V1
SYMATTR Value AC 1
TEXT -240 -280 Left 2 !.lib opamp.sub
TEXT -240 -224 Left 2 !.ac dec 10000 10 100k
TEXT 72 -280 Left 2 ;R1=R3\nR4=R5=R2/2=R\n \nf=1/(2*pi*R*sqrt(C1*C2))