Version 4
SHEET 1 1280 680
WIRE 80 -96 -176 -96
WIRE 256 -96 80 -96
WIRE 560 -96 256 -96
WIRE 864 -96 560 -96
WIRE 256 -64 256 -96
WIRE 560 -16 560 -96
WIRE -176 32 -176 -96
WIRE 256 32 256 16
WIRE 400 32 256 32
WIRE 496 32 400 32
WIRE 864 96 864 -96
WIRE 80 144 80 -96
WIRE 256 144 256 32
WIRE 560 144 560 80
WIRE 704 144 560 144
WIRE 800 144 704 144
WIRE -176 160 -176 112
WIRE -176 160 -240 160
WIRE -240 192 -240 160
WIRE -16 192 -64 192
WIRE 16 192 -16 192
WIRE 352 192 320 192
WIRE 368 192 352 192
WIRE 1008 192 864 192
WIRE 1072 192 1008 192
WIRE 1136 192 1072 192
WIRE -176 208 -176 160
WIRE 864 208 864 192
WIRE 368 224 368 192
WIRE 160 240 80 240
WIRE 256 240 160 240
WIRE 560 256 560 144
WIRE 800 256 560 256
WIRE 160 320 160 240
WIRE 560 320 560 256
WIRE 1136 320 1136 256
WIRE 1136 352 1136 320
WIRE -176 400 -176 288
WIRE 160 400 -176 400
WIRE 560 400 160 400
WIRE 864 400 864 304
WIRE 864 400 560 400
WIRE -64 432 -64 192
WIRE 1008 432 1008 272
WIRE 1008 432 -64 432
WIRE 1008 464 1008 432
FLAG 368 304 0
FLAG 160 240 tail
FLAG -16 192 left
FLAG 352 192 right
FLAG 1008 544 0
FLAG 1136 432 0
FLAG 1136 320 out
FLAG 704 144 out2
FLAG 400 32 out1
FLAG 1072 192 out3
FLAG -240 192 0
SYMBOL npn 16 144 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL npn 320 144 M0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL pnp 496 80 M180
SYMATTR InstName Q3
SYMATTR Value 2N3906
SYMBOL res 144 304 R0
SYMATTR InstName Rtail
SYMATTR Value 10k
SYMBOL res 240 -80 R0
SYMATTR InstName RC
SYMATTR Value 20k
SYMBOL res 544 304 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL voltage -176 16 R0
SYMATTR InstName V1
SYMATTR Value 6
SYMBOL voltage -176 192 R0
SYMATTR InstName V2
SYMATTR Value 6
SYMBOL voltage 368 208 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 AC 1
SYMATTR InstName V4
SYMATTR Value SINE(0 .05 1k)
SYMBOL res 992 176 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 992 448 R0
SYMATTR InstName R2
SYMATTR Value 200
SYMBOL res 1120 336 R0
SYMATTR InstName Rspeaker
SYMATTR Value 8
SYMBOL cap 1120 192 R0
SYMATTR InstName C1
SYMATTR Value 100µ
SYMBOL pnp 800 304 M180
SYMATTR InstName Q4
SYMATTR Value 2N3906
SYMBOL npn 800 96 R0
SYMATTR InstName Q6
SYMATTR Value 2N3904
TEXT -232 408 Left 2 !.tran 5m