Version 4
SHEET 1 1632 680
WIRE -400 -96 -576 -96
WIRE 80 -96 -400 -96
WIRE 256 -96 80 -96
WIRE 784 -96 256 -96
WIRE 1232 -96 784 -96
WIRE 80 -64 80 -96
WIRE 256 -64 256 -96
WIRE 160 -16 144 -16
WIRE 192 -16 160 -16
WIRE 784 -16 784 -96
WIRE -400 0 -400 -96
WIRE -576 32 -576 -96
WIRE 400 32 256 32
WIRE 720 32 400 32
WIRE 80 64 80 32
WIRE 160 64 160 -16
WIRE 160 64 80 64
WIRE 784 96 784 80
WIRE 928 96 784 96
WIRE 1232 96 1232 -96
WIRE 784 112 784 96
WIRE 80 144 80 64
WIRE 256 144 256 32
WIRE 928 144 928 96
WIRE 1072 144 928 144
WIRE 1168 144 1072 144
WIRE -576 160 -576 112
WIRE -576 160 -640 160
WIRE -640 192 -640 160
WIRE -16 192 -64 192
WIRE 16 192 -16 192
WIRE 352 192 320 192
WIRE 416 192 352 192
WIRE 512 192 496 192
WIRE 1360 192 1232 192
WIRE 1424 192 1360 192
WIRE 1488 192 1424 192
WIRE -576 208 -576 160
WIRE 784 208 784 176
WIRE 1232 208 1232 192
WIRE 512 224 512 192
WIRE 160 240 80 240
WIRE 256 240 160 240
WIRE 1168 256 928 256
WIRE -400 288 -400 80
WIRE -320 288 -400 288
WIRE 784 288 784 272
WIRE 928 288 928 256
WIRE 928 288 784 288
WIRE -400 320 -400 288
WIRE 160 320 160 240
WIRE 784 320 784 288
WIRE 1488 320 1488 256
WIRE 1488 352 1488 320
WIRE -320 368 -320 288
WIRE -320 368 -336 368
WIRE 96 368 -320 368
WIRE 720 368 96 368
WIRE 1360 400 1360 272
WIRE 1360 400 1312 400
WIRE -576 448 -576 288
WIRE -400 448 -400 416
WIRE -400 448 -576 448
WIRE 160 448 160 416
WIRE 160 448 -400 448
WIRE 784 448 784 416
WIRE 784 448 160 448
WIRE 1232 448 1232 304
WIRE 1232 448 784 448
WIRE 1360 464 1360 400
WIRE -64 480 -64 192
WIRE 1312 480 1312 400
WIRE 1312 480 -64 480
FLAG 512 304 0
FLAG 160 240 tail
FLAG -16 192 left
FLAG 1360 544 0
FLAG 1488 432 0
FLAG 1488 320 out
FLAG 1072 144 out2
FLAG 400 32 out1
FLAG 1424 192 out3
FLAG -640 192 0
FLAG 352 192 right
FLAG 512 192 in
SYMBOL npn 16 144 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL npn 320 144 M0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL pnp 720 80 M180
SYMATTR InstName Q3
SYMATTR Value 2N3906
SYMBOL res -416 -16 R0
SYMATTR InstName Rtail
SYMATTR Value 10k
SYMBOL voltage -576 16 R0
SYMATTR InstName V1
SYMATTR Value 6
SYMBOL voltage -576 192 R0
SYMATTR InstName V2
SYMATTR Value 6
SYMBOL voltage 512 208 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 AC 1
SYMATTR InstName V4
SYMATTR Value SINE(0 0.01 1k)
SYMBOL res 1344 176 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 1344 448 R0
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL res 1472 336 R0
SYMATTR InstName Rspeaker
SYMATTR Value 8
SYMBOL cap 1472 192 R0
SYMATTR InstName C1
SYMATTR Value 100µ
SYMBOL pnp 1168 304 M180
SYMATTR InstName Q4
SYMATTR Value 2N3906
SYMBOL npn 1168 96 R0
SYMATTR InstName Q6
SYMATTR Value 2N3904
SYMBOL pnp 192 32 M180
SYMATTR InstName Q5
SYMATTR Value 2N3906
SYMBOL pnp 144 32 R180
SYMATTR InstName Q7
SYMATTR Value 2N3906
SYMBOL npn 96 320 R0
SYMATTR InstName Q8
SYMATTR Value 2N3904
SYMBOL npn 720 320 R0
SYMATTR InstName Q9
SYMATTR Value 2N3904
SYMBOL npn -336 320 M0
SYMATTR InstName Q10
SYMATTR Value 2N3904
SYMBOL res 512 176 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName Rsource
SYMATTR Value 10k
SYMBOL diode 768 112 R0
SYMATTR InstName D1
SYMBOL diode 768 208 R0
SYMATTR InstName D2
TEXT -632 456 Left 2 !.tran 5m