Version 4
SHEET 1 880 680
WIRE 64 -64 -32 -64
WIRE 240 -64 64 -64
WIRE 336 -64 240 -64
WIRE -32 -16 -32 -64
WIRE 64 -16 64 -64
WIRE 240 32 240 -64
WIRE 64 80 64 64
WIRE 144 80 64 80
WIRE 176 80 144 80
WIRE 64 112 64 80
WIRE -128 160 -160 160
WIRE -96 160 -128 160
WIRE -32 160 -32 64
WIRE 0 160 -32 160
WIRE 240 160 240 128
WIRE 256 160 240 160
WIRE 272 160 256 160
WIRE 368 160 336 160
WIRE -160 192 -160 160
WIRE 240 192 240 160
WIRE 368 224 368 160
WIRE 64 240 64 208
WIRE 144 240 64 240
WIRE 176 240 144 240
WIRE -32 256 -32 160
WIRE 64 256 64 240
WIRE 240 336 240 288
WIRE 368 336 368 304
FLAG 64 336 0
FLAG -32 336 0
FLAG 240 336 0
FLAG 368 336 0
FLAG 336 16 0
FLAG -160 272 0
FLAG -128 160 Inp
FLAG 368 160 Out
FLAG 144 80 M1
FLAG 144 240 M2
FLAG 256 160 M3
SYMBOL npn 0 112 R0
SYMATTR InstName Q1
SYMATTR Value BC547A
SYMBOL res -48 -32 R0
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL res -48 240 R0
SYMATTR InstName R2
SYMATTR Value 22k
SYMBOL res 48 -32 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res 48 240 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL npn 176 32 R0
SYMATTR InstName Q2
SYMATTR Value BC547A
SYMBOL npn 176 192 R0
SYMATTR InstName Q3
SYMATTR Value BC547A
SYMBOL cap 272 176 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C1
SYMATTR Value 100µ
SYMBOL res 352 208 R0
SYMATTR InstName RLast
SYMATTR Value 30
SYMBOL cap -32 144 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 100µ
SYMBOL Misc\\battery 336 -80 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 10V
SYMBOL voltage -160 176 R0
WINDOW 3 -19 129 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(0 100mV 1k)
TEXT -194 352 Left 2 !.tran 10m