Version 4
SHEET 1 1924 724
WIRE 32 128 -32 128
WIRE 208 128 176 128
WIRE 320 128 256 128
WIRE -32 144 -32 128
WIRE 256 144 256 128
WIRE 208 160 208 128
WIRE -32 240 -32 224
WIRE 208 240 208 208
WIRE 256 240 256 224
FLAG -32 240 0
FLAG 256 240 0
FLAG 208 240 0
FLAG 32 128 in
FLAG 176 128 in
FLAG 320 128 out1
SYMBOL voltage -32 128 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 0
SYMATTR Value2 AC 1 0
SYMATTR InstName V1
SYMATTR Value ""
SYMBOL e 256 128 R0
SYMATTR InstName E1
SYMATTR Value Laplace=1/((s/(2*pi)+1)*(s^2/(2*pi)^2 + s/(2*pi)*0.6180 +1) *( s^2/(2*pi)^2 + s/(2*pi)*1.6180 + 1))
TEXT -48 336 Left 2 !.ac dec 100 0.001 10MEG
TEXT -56 -48 Left 2 ;https://www.mikrocontroller.net/topic/470031#5763378
TEXT 288 288 Left 2 ;https://en.wikipedia.org/wiki/Butterworth_filter
TEXT -56 24 Left 4 ;Grenzfrequenz 1Hz