Version 4
SHEET 1 880 680
WIRE 336 -48 96 -48
WIRE 480 -48 336 -48
WIRE 96 -32 96 -48
WIRE 336 16 336 -48
WIRE -64 64 -176 64
WIRE -16 64 -64 64
WIRE 96 64 96 48
WIRE 96 64 48 64
WIRE 208 64 96 64
WIRE 272 64 208 64
WIRE 208 80 208 64
WIRE 480 96 480 -48
WIRE -176 128 -176 64
WIRE -64 144 -64 64
WIRE 96 144 96 64
WIRE 208 160 208 144
WIRE 336 160 336 112
WIRE 336 160 208 160
WIRE 336 176 336 160
WIRE 208 192 208 160
WIRE -176 272 -176 192
WIRE -64 272 -64 224
WIRE -64 272 -176 272
WIRE 96 272 96 224
WIRE 96 272 -64 272
WIRE 208 272 208 256
WIRE 208 272 96 272
WIRE 336 272 336 256
WIRE 336 272 208 272
WIRE 480 272 480 176
WIRE 480 272 336 272
WIRE 480 304 480 272
FLAG 480 304 0
SYMBOL res 80 240 M180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R2
SYMATTR Value 2500
SYMBOL res 320 160 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL cap 224 80 M0
WINDOW 0 -21 12 Left 0
WINDOW 3 -48 53 Left 0
SYMATTR InstName C1
SYMATTR Value 100p
SYMBOL cap 192 192 R0
WINDOW 3 23 50 Left 0
SYMATTR Value 100p
SYMATTR InstName C2
SYMBOL cap -160 128 M0
WINDOW 0 -37 16 Left 0
WINDOW 3 -45 60 Left 0
SYMATTR InstName C3
SYMATTR Value 100p
SYMBOL cap 48 48 R90
WINDOW 0 -33 31 VBottom 0
WINDOW 3 -30 28 VTop 0
SYMATTR InstName C4
SYMATTR Value 10p
SYMBOL npn 272 16 R0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL ind -80 128 R0
WINDOW 0 39 23 Left 0
WINDOW 3 43 61 Left 0
SYMATTR InstName L1
SYMATTR Value 1µ
SYMBOL voltage 480 80 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 19
SYMBOL res 80 -48 R0
SYMATTR InstName R1
SYMATTR Value 20k
TEXT -176 -80 Left 0 !.tran 0 1m 0 .1u