Version 4
SHEET 1 880 680
WIRE 112 128 -224 128
WIRE 272 128 208 128
WIRE 432 128 272 128
WIRE 272 160 272 128
WIRE 432 160 432 128
WIRE -224 192 -224 128
WIRE 160 240 160 192
WIRE 272 240 160 240
WIRE 160 256 160 240
WIRE -224 352 -224 272
WIRE 160 352 160 320
WIRE 432 352 432 240
FLAG 160 352 0
FLAG 432 352 0
FLAG -224 352 0
SYMBOL npn 208 192 M270
SYMATTR InstName Q1
SYMATTR Value BC546B
SYMBOL res 256 144 R0
SYMATTR InstName R1
SYMATTR Value 2.2k
SYMATTR SpiceLine ""
SYMBOL cap 144 256 R0
SYMATTR InstName C1
SYMATTR Value 100µ
SYMATTR SpiceLine ""
SYMBOL voltage 432 144 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 AC 0
SYMATTR SpiceLine ""
SYMATTR InstName V1
SYMATTR Value SINE(15 0.02 500)
SYMBOL res -240 176 R0
SYMATTR InstName R2
SYMATTR Value 2.2k
SYMATTR SpiceLine ""
TEXT 48 376 Left 2 !.tran 0.1