Version 4
SHEET 1 1532 680
WIRE 608 -32 432 -32
WIRE 912 -32 672 -32
WIRE 768 80 768 32
WIRE 304 96 96 96
WIRE 432 96 432 -32
WIRE 432 96 384 96
WIRE 496 96 432 96
WIRE 640 96 576 96
WIRE 736 96 640 96
WIRE 912 112 912 -32
WIRE 912 112 800 112
WIRE 1008 112 912 112
WIRE 1120 112 1088 112
WIRE 1232 112 1120 112
WIRE 736 128 704 128
WIRE 96 176 96 96
WIRE 704 176 704 128
WIRE 912 176 912 112
WIRE 912 176 704 176
WIRE 768 224 768 144
WIRE 640 240 640 96
WIRE 1120 240 1120 112
WIRE 96 336 96 256
WIRE 640 336 640 304
WIRE 768 336 768 304
WIRE 1120 336 1120 304
FLAG 96 336 0
FLAG 640 336 0
FLAG 768 32 0
FLAG 768 336 0
FLAG 1120 336 0
SYMBOL voltage 96 160 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 AC 1
SYMATTR InstName V1
SYMATTR Value PULSE(0 3 0 100n 100n 50µ 100µ 200)
SYMBOL cap 624 240 R0
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL res 400 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 6.8k
SYMBOL voltage 768 208 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL res 592 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 6.8k
SYMBOL cap 672 -48 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 100n
SYMBOL Opamps\\UniversalOpamp2 768 112 M180
SYMATTR InstName U1
SYMBOL res 1104 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 100
SYMBOL cap 1104 240 R0
SYMATTR InstName C3
SYMATTR Value 1µ
TEXT 64 360 Left 2 !.tran 100m
TEXT 944 -128 Left 2 ;RC-Glied:  10k, 100n = 160Hz, Rippel = 75 mV\n \nSallenKey/Bessel 2.Ordnung 125Hz, Rippel = 320 µV\nt-rise/fall ca. 2,3ms
TEXT 64 384 Left 2 ;.ac dec 100 1 100k
TEXT 184 216 Left 2 ;f = 10 kHz