Version 4
SHEET 1 880 680
WIRE 240 -192 192 -192
WIRE 352 -192 304 -192
WIRE 192 -96 192 -192
WIRE 240 -96 192 -96
WIRE 352 -96 352 -192
WIRE 352 -96 304 -96
WIRE -192 16 -240 16
WIRE -96 16 -128 16
WIRE 32 16 -16 16
WIRE 80 16 32 16
WIRE 192 16 192 -96
WIRE 192 16 160 16
WIRE 224 16 192 16
WIRE 352 16 352 -96
WIRE 352 16 304 16
WIRE -240 48 -240 16
WIRE 128 128 128 112
WIRE 32 144 32 16
WIRE 96 144 32 144
WIRE 352 160 352 16
WIRE 352 160 160 160
WIRE 384 160 352 160
WIRE -96 176 -144 176
WIRE 32 176 -32 176
WIRE 96 176 32 176
WIRE 128 208 128 192
WIRE -144 288 -144 176
WIRE -96 288 -144 288
WIRE 32 288 32 176
WIRE 32 288 -16 288
WIRE 80 288 32 288
WIRE 352 288 352 160
WIRE 352 288 160 288
WIRE -144 320 -144 288
WIRE 128 400 128 384
WIRE 256 400 256 384
WIRE 128 496 128 480
WIRE 256 496 256 480
FLAG -240 48 0
FLAG 384 160 out
FLAG 128 112 +V
FLAG 128 208 -V
FLAG -144 320 0
FLAG 128 496 0
FLAG 256 496 0
FLAG 128 384 +V
FLAG 256 384 -V
SYMBOL Opamps\\UniversalOpamp2 128 160 R0
SYMATTR InstName U1
SYMBOL Misc\\EuropeanResistor 176 0 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R3a
SYMATTR Value 18k
SYMBOL Misc\\EuropeanResistor 0 0 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor 0 272 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor 176 272 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL cap -128 0 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
WINDOW 39 85 35 VBottom 2
SYMATTR InstName C1
SYMATTR Value 0.0159u
SYMATTR SpiceLine IC=10m
SYMBOL cap -32 160 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 0.0159u
SYMBOL voltage 128 384 R0
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage 256 384 R0
SYMATTR InstName V2
SYMATTR Value -15
SYMBOL res 320 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3b
SYMATTR Value 5k
SYMBOL diode 304 -112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D1
SYMBOL diode 240 -176 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
TEXT -264 -320 Left 2 !.tran 0 30m 0 1u
TEXT -264 -288 Left 2 !.options plotwinsize=0
TEXT -264 -208 Left 2 ;f = 1/(2*pi*R*C)    \n \nR1*C1=R2*C2\nR3/R1=2\nR4/R2=1