Version 4
SHEET 1 880 680
WIRE 176 64 112 64
WIRE 272 64 256 64
WIRE 16 144 0 144
WIRE 112 144 112 64
WIRE 112 144 96 144
WIRE 160 144 112 144
WIRE 0 160 0 144
WIRE 0 160 -48 160
WIRE 336 160 336 64
WIRE 336 160 224 160
WIRE 368 160 336 160
WIRE 160 176 144 176
WIRE -48 192 -48 160
WIRE 0 208 0 160
WIRE 16 208 0 208
WIRE 112 208 112 144
WIRE 112 208 80 208
WIRE 144 240 144 176
WIRE -48 288 -48 272
FLAG 144 240 0
FLAG -48 288 0
FLAG 368 160 out
SYMBOL res 112 128 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 -21 107 VTop 0
SYMATTR InstName R1
SYMATTR Value 27k
SYMBOL res 272 48 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL cap 80 192 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C1
SYMATTR Value 1.5n
SYMBOL cap 336 48 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C2
SYMATTR Value 33n
SYMBOL voltage -48 176 R0
WINDOW 3 92 151 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PWL(0 -1 1n 0)
SYMATTR InstName V1
SYMBOL Opamps\\opamp2 192 96 R0
SYMATTR InstName U1
SYMATTR Value LM358/NS
TEXT -80 312 Left 0 !.tran 5m
TEXT -104 72 Left 0 !.inc LM358.mod