Version 4
SHEET 1 880 680
WIRE 304 -16 96 -16
WIRE 496 -16 304 -16
WIRE 304 32 304 -16
WIRE -80 80 -144 80
WIRE -64 80 -80 80
WIRE 96 80 96 64
WIRE 96 80 0 80
WIRE 176 80 96 80
WIRE 240 80 176 80
WIRE 96 96 96 80
WIRE 176 96 176 80
WIRE 496 96 496 -16
WIRE -144 128 -144 80
WIRE -80 144 -80 80
WIRE 304 160 304 128
WIRE 304 160 176 160
WIRE 304 176 304 160
WIRE 176 192 176 160
WIRE -144 256 -144 192
WIRE -80 256 -80 224
WIRE -80 256 -144 256
WIRE 96 256 96 176
WIRE 96 256 -80 256
WIRE 176 256 96 256
WIRE 304 256 176 256
WIRE 496 256 496 176
WIRE 496 256 304 256
FLAG 96 256 0
SYMBOL res 80 -32 R0
WINDOW 0 4 -2 Left 0
WINDOW 3 8 -33 Left 0
SYMATTR Value 20K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 80 80 R0
WINDOW 0 -38 74 Left 0
WINDOW 3 -41 109 Left 0
SYMATTR InstName R2
SYMATTR Value 2500
SYMBOL res 288 160 R0
SYMATTR InstName R3
SYMATTR Value 250
SYMBOL cap 160 96 R0
WINDOW 0 -21 12 Left 0
WINDOW 3 -48 53 Left 0
SYMATTR InstName C1
SYMATTR Value 70p
SYMBOL cap 160 192 R0
WINDOW 3 23 50 Left 0
SYMATTR Value 70p
SYMATTR InstName C2
SYMBOL cap -160 128 R0
WINDOW 0 -70 14 Left 0
WINDOW 3 -80 60 Left 0
SYMATTR InstName C3
SYMATTR Value 100p
SYMBOL cap 0 64 R90
WINDOW 0 -33 31 VBottom 0
WINDOW 3 -30 28 VTop 0
SYMATTR InstName C4
SYMATTR Value 50p
SYMBOL npn 240 32 R0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL ind -96 128 R0
WINDOW 0 37 8 Left 0
WINDOW 3 35 43 Left 0
SYMATTR InstName L1
SYMATTR Value 1e-6
SYMBOL voltage 496 80 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 19
TEXT -240 280 Left 0 !.tran 100us