Version 4.1
SHEET 1 1600 680
WIRE -208 -32 -240 -32
WIRE -80 -32 -128 -32
WIRE 0 -32 -80 -32
WIRE 80 -32 0 -32
WIRE 224 -32 160 -32
WIRE 336 -32 224 -32
WIRE 416 -32 336 -32
WIRE 0 16 0 -32
WIRE 224 16 224 -32
WIRE 416 16 416 -32
WIRE -240 32 -240 -32
WIRE -240 144 -240 112
WIRE 0 144 0 80
WIRE 0 144 -240 144
WIRE 112 144 0 144
WIRE 224 144 224 80
WIRE 224 144 112 144
WIRE 416 144 416 96
WIRE 416 144 224 144
WIRE 112 160 112 144
FLAG 112 160 0
FLAG -80 -32 in
FLAG 336 -32 out
SYMBOL ind 176 -48 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L1
SYMATTR Value 8µH
SYMBOL cap -16 16 R0
SYMATTR InstName C1
SYMATTR Value 3.2nF
SYMBOL cap 208 16 R0
SYMATTR InstName C2
SYMATTR Value 3.2nF
SYMBOL voltage -240 16 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value ac 1.
SYMBOL res -112 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 50R
SYMBOL res 400 0 R0
SYMATTR InstName R2
SYMATTR Value 50R
TEXT -136 -408 Left 5 ;low pass filter
TEXT -312 192 Left 2 !.ac dec 100 1k 1E9
TEXT -200 -352 Left 4 ;Instructions
TEXT -200 -312 Left 2 ;click on run\nthen click on circuit node  "in"\nthe node "in" rolls off at 20dbs/decade, \nthis is the characteristic of the source impedance R1, and the input capacitance C1\nthen click on cct node "out"\nthe node "out" rolls off at 60dbs /decade.\nthis is the characteristic of the above 20dbs/decade plus the 40dbs/decade \nof the following LC filter (L1 and C2).