Version 4
SHEET 1 880 680
WIRE -16 -16 -160 -16
WIRE 96 -16 -16 -16
WIRE 208 -16 96 -16
WIRE 384 -16 208 -16
WIRE -16 16 -16 -16
WIRE 96 16 96 -16
WIRE 208 16 208 -16
WIRE 384 16 384 -16
WIRE 208 112 208 96
WIRE 208 112 -96 112
WIRE -160 128 -160 -16
WIRE 384 144 384 96
WIRE 496 144 384 144
WIRE -16 192 -16 96
WIRE 16 192 -16 192
WIRE 96 192 96 96
WIRE 128 192 96 192
WIRE 208 192 208 112
WIRE 224 192 208 192
WIRE 320 192 304 192
WIRE -96 240 -96 112
WIRE -80 240 -96 240
WIRE 16 240 16 192
WIRE 32 240 16 240
WIRE 128 240 128 192
WIRE 144 240 128 240
WIRE -160 256 -160 208
WIRE -16 336 -16 288
WIRE 96 336 96 288
WIRE 96 336 -16 336
WIRE 144 336 96 336
WIRE 208 336 208 288
WIRE 208 336 144 336
WIRE 384 336 384 240
WIRE 384 336 208 336
WIRE 400 336 384 336
WIRE 144 368 144 336
FLAG 144 368 0
FLAG -160 256 0
FLAG 496 144 Out
SYMBOL npn2 -80 192 R0
WINDOW 0 26 47 Left 2
WINDOW 3 -37 110 Left 2
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL voltage -160 112 R0
WINDOW 3 -62 56 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 -110 105 Left 2
SYMATTR InstName V1
SYMATTR Value 6
SYMATTR SpiceLine Rser=0.1
SYMBOL npn2 32 192 R0
WINDOW 0 22 44 Left 2
WINDOW 3 -35 108 Left 2
SYMATTR InstName Q2
SYMATTR Value BC547C
SYMBOL npn2 144 192 R0
WINDOW 0 22 49 Left 2
WINDOW 3 -33 108 Left 2
SYMATTR InstName Q3
SYMATTR Value BC547C
SYMBOL npn2 320 144 R0
WINDOW 0 39 37 Left 2
WINDOW 3 47 65 Left 2
SYMATTR InstName Q4
SYMATTR Value BC547C
SYMBOL Misc\\EuropeanResistor -32 0 R0
SYMATTR InstName R1
SYMATTR Value 3k
SYMBOL Misc\\EuropeanResistor 80 0 R0
SYMATTR InstName R2
SYMATTR Value 3k
SYMBOL Misc\\EuropeanResistor 192 0 R0
SYMATTR InstName R3
SYMATTR Value 3k
SYMBOL Misc\\EuropeanResistor 320 176 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 3k
SYMBOL Misc\\EuropeanResistor 368 0 R0
SYMATTR InstName R5
SYMATTR Value 3k
TEXT -202 352 Left 2 !.tran 0 100ms 0