Version 4
SHEET 1 880 680
WIRE 192 -96 16 -96
WIRE 624 -96 192 -96
WIRE 16 0 16 -96
WIRE 192 0 192 -96
WIRE 192 112 192 80
WIRE 272 112 192 112
WIRE 416 112 336 112
WIRE 624 112 624 -96
WIRE 192 144 192 112
WIRE -336 192 -464 192
WIRE -128 192 -256 192
WIRE 16 192 16 80
WIRE 16 192 -64 192
WIRE 128 192 16 192
WIRE 416 192 416 112
WIRE -464 256 -464 192
WIRE 16 256 16 192
WIRE -464 400 -464 336
WIRE 16 400 16 336
WIRE 16 400 -464 400
WIRE 192 400 192 240
WIRE 192 400 16 400
WIRE 416 400 416 272
WIRE 416 400 192 400
WIRE 624 400 624 192
WIRE 624 400 416 400
WIRE 192 448 192 400
FLAG 192 448 0
SYMBOL npn 128 144 R0
SYMATTR InstName Q1
SYMATTR Value BC337-25
SYMBOL res 176 -16 R0
SYMATTR InstName Rc
SYMATTR Value 100
SYMBOL res 0 -16 R0
SYMATTR InstName R1
SYMATTR Value 14k
SYMBOL res 0 240 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL voltage 624 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 15V
SYMBOL Misc\\signal -464 240 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(0 0.5 1K)
SYMBOL cap -64 176 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 100µ
SYMBOL cap 336 96 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 100µ
SYMBOL res 400 176 R0
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL res -240 176 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 1.9k
TEXT 0 472 Left 2 !.tran 10ms