Version 4
SHEET 1 880 680
WIRE 208 -48 -32 -48
WIRE 448 -48 208 -48
WIRE -32 -16 -32 -48
WIRE 208 -16 208 -48
WIRE 448 -16 448 -48
WIRE -32 96 -32 64
WIRE 208 96 208 64
WIRE 256 96 208 96
WIRE 304 96 256 96
WIRE 304 112 304 96
WIRE 448 112 448 64
WIRE 208 160 208 96
WIRE 448 160 448 112
WIRE 144 208 -32 208
WIRE 304 208 304 192
WIRE 384 208 304 208
WIRE -32 272 -32 208
WIRE 208 288 208 256
WIRE 256 288 208 288
WIRE 448 288 448 256
WIRE 448 288 256 288
WIRE 208 304 208 288
WIRE 304 304 304 208
WIRE -32 400 -32 352
WIRE 208 400 208 384
WIRE 304 400 304 384
WIRE 304 400 208 400
WIRE 208 416 208 400
FLAG 208 416 0
FLAG -32 96 0
FLAG -32 400 0
FLAG 256 288 e
FLAG 256 96 c1
FLAG 448 112 c2
SYMBOL npn 144 160 R0
SYMATTR InstName Q1
SYMATTR Value BC547B
SYMBOL npn 384 160 R0
SYMATTR InstName Q2
SYMATTR Value BC847B
SYMBOL Misc\\EuropeanResistor 192 -32 R0
SYMATTR InstName R1
SYMATTR Value 470
SYMBOL Misc\\EuropeanResistor 288 96 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor 288 288 R0
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL Misc\\EuropeanResistor 192 288 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL Misc\\EuropeanResistor 432 -32 R0
SYMATTR InstName R5
SYMATTR Value 470
SYMBOL voltage -32 256 R0
WINDOW 3 24 97 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 24 132 Left 0
SYMATTR InstName V1
SYMATTR Value PWL(0 0 1 7 2 0)
SYMATTR SpiceLine Rser=1k
SYMBOL voltage -32 -32 R0
SYMATTR InstName V2
SYMATTR Value 9
TEXT -40 -96 Left 0 !.tran 0 2 0 1m