Version 4
SHEET 1 880 680
WIRE 240 -160 64 -160
WIRE 688 -160 240 -160
WIRE 64 -96 64 -160
WIRE 240 0 240 -160
WIRE 64 48 64 -16
WIRE 176 48 64 48
WIRE 240 128 240 96
WIRE 240 128 -144 128
WIRE 352 128 240 128
WIRE 480 128 416 128
WIRE 64 144 64 112
WIRE 240 160 240 128
WIRE 688 160 688 -160
WIRE 480 192 480 128
WIRE 176 208 64 208
WIRE -144 240 -144 128
WIRE 64 352 64 208
WIRE -336 400 -464 400
WIRE -144 400 -144 320
WIRE -144 400 -272 400
WIRE 0 400 -144 400
WIRE -464 448 -464 400
WIRE -144 464 -144 400
WIRE -464 592 -464 528
WIRE -144 592 -144 544
WIRE -144 592 -464 592
WIRE 64 592 64 448
WIRE 64 592 -144 592
WIRE 240 592 240 256
WIRE 240 592 64 592
WIRE 480 592 480 272
WIRE 480 592 240 592
WIRE 688 592 688 240
WIRE 688 592 480 592
WIRE 240 656 240 592
FLAG 240 656 0
SYMBOL pnp 176 256 M180
SYMATTR InstName Q1
SYMATTR Value BD140
SYMBOL npn 176 0 R0
SYMATTR InstName Q2
SYMATTR Value BD139
SYMBOL cap 416 112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1
SYMBOL res 464 176 R0
SYMATTR InstName R1
SYMATTR Value 8
SYMBOL res 48 -112 R0
SYMATTR InstName R2
SYMBOL voltage 688 144 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage -464 432 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(0 0.2 400)
SYMBOL diode 48 144 R0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL diode 48 48 R0
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL npn 0 352 R0
SYMATTR InstName Q3
SYMBOL res -160 224 R0
SYMATTR InstName R3
SYMBOL res -160 448 R0
SYMATTR InstName R4
SYMBOL cap -272 384 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
TEXT -48 616 Left 2 !.tran 0 10.01 10 0.001