Version 4
SHEET 1 1032 680
WIRE 64 -80 -48 -80
WIRE 256 -80 64 -80
WIRE 64 16 64 -80
WIRE 320 80 160 80
WIRE 448 80 384 80
WIRE 512 80 448 80
WIRE 864 80 576 80
WIRE -48 96 -48 -80
WIRE 256 128 256 -80
WIRE 448 144 448 80
WIRE 64 176 64 96
WIRE 160 176 160 80
WIRE 160 176 144 176
WIRE 192 176 160 176
WIRE -48 208 -48 176
WIRE 256 240 256 224
WIRE 448 240 448 224
WIRE 448 240 256 240
WIRE 64 256 64 176
WIRE 256 256 256 240
WIRE 688 288 480 288
WIRE 864 320 864 80
WIRE 864 320 832 320
WIRE 64 368 64 336
WIRE 256 384 256 336
WIRE 480 416 480 368
FLAG 256 384 0
FLAG 64 368 0
FLAG -48 208 0
FLAG 480 416 0
SYMBOL npn 192 128 R0
SYMATTR InstName Q1
SYMBOL res 240 240 R0
SYMATTR InstName R1
SYMATTR Value 10K
SYMBOL res 160 192 M270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 470k
SYMBOL res 432 240 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R3
SYMATTR Value 470
SYMBOL res 48 0 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL res 48 240 R0
SYMATTR InstName R5
SYMATTR Value 1K
SYMBOL cap 384 64 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 47n
SYMBOL cap 576 64 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 220n
SYMBOL voltage -48 80 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 9
SYMBOL voltage 480 272 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value PWL(0 0 0.5 1)
SYMBOL SpecialFunctions\\modulate 688 288 R0
WINDOW 3 16 -20 Left 2
SYMATTR InstName A1
SYMATTR Value mark=300 space=1
TEXT -224 408 Left 2 !.tran 0.5