Version 4
SHEET 1 880 680
WIRE 320 -16 272 -16
WIRE 368 -16 320 -16
WIRE 368 0 368 -16
WIRE 272 64 272 -16
WIRE 144 160 96 160
WIRE 272 160 272 144
WIRE 272 160 224 160
WIRE 336 160 272 160
WIRE 368 160 336 160
WIRE 272 176 272 160
WIRE 336 192 336 160
WIRE 96 208 96 160
WIRE 272 288 272 256
WIRE 336 288 336 256
FLAG 96 288 0
FLAG 368 80 0
FLAG 272 288 0
FLAG 368 160 adc
FLAG 96 160 in
FLAG 320 -16 vcc
FLAG 336 288 0
SYMBOL voltage 96 192 R0
WINDOW 123 24 112 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value SINE(0 5 100)
SYMATTR Value2 AC {att}
SYMBOL voltage 368 -16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 3.3
SYMBOL res 256 48 R0
SYMATTR InstName R2
SYMATTR Value {r2}
SYMBOL res 128 176 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value {r1}
SYMBOL res 256 160 R0
SYMATTR InstName R3
SYMATTR Value {r3}
SYMBOL cap 320 192 R0
SYMATTR InstName C1
SYMATTR Value 22n
TEXT 80 -144 Left 2 !;tran 0 110m 100m
TEXT 80 -128 Left 2 !.ac dec 100 1 100k
TEXT 80 -112 Left 2 !.param r1=22k, r2=12k, r3=27k
TEXT 88 328 Left 2 !.param att=(r1+(1/((1/r2)+(1/r3))))/(1/((1/r2)+(1/r3)))
TEXT 80 -72 Left 2 ;Abschwächung: 3,65\n(R1+R2||R3)/(R2||R3)
TEXT 80 -32 Left 2 ;Offset: 1,66V\nVcc*(R1||R3)/(R2+R1||R3)
TEXT 80 8 Left 2 ;Grenzfrequenz: 1200Hz\n1/(2*pi*R1||R2||R3*C1)