Version 4
SHEET 1 880 680
WIRE 96 80 48 80
WIRE 224 80 176 80
WIRE 304 80 224 80
WIRE 224 112 224 80
WIRE 224 208 224 176
FLAG 224 208 0
FLAG 304 80 out
IOPIN 304 80 Out
FLAG 48 80 in
IOPIN 48 80 In
SYMBOL cap 208 112 R0
SYMATTR InstName C1
SYMATTR Value {C1}
SYMBOL res 192 64 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value {R1}
TEXT -8 -64 Left 2 !.param R1=1k
TEXT -8 -24 Left 2 !.param C1=tau/R1
TEXT -8 -104 Left 2 !.param tau=1m