Version 4
SHEET 1 880 752
WIRE -48 -160 -80 -160
WIRE 32 -160 -48 -160
WIRE 128 -160 32 -160
WIRE 240 -160 128 -160
WIRE 32 -144 32 -160
WIRE 240 -144 240 -160
WIRE 272 -144 240 -144
WIRE 640 -144 272 -144
WIRE 240 -80 128 -80
WIRE 256 -80 240 -80
WIRE 128 -32 128 -80
WIRE 32 16 32 -80
WIRE 32 16 -80 16
WIRE 192 16 32 16
WIRE 272 64 272 -144
WIRE 128 112 128 64
WIRE 144 112 128 112
WIRE 208 112 144 112
WIRE -80 128 -80 16
WIRE -144 176 -208 176
WIRE 736 192 592 192
WIRE -16 224 -80 224
WIRE 0 224 -16 224
WIRE 32 224 0 224
WIRE 128 224 112 224
WIRE 208 224 208 112
WIRE 272 240 176 240
WIRE 512 240 512 192
WIRE 512 240 272 240
WIRE -208 288 -208 176
WIRE -208 288 -592 288
WIRE -128 288 -160 288
WIRE -80 288 -128 288
WIRE 128 288 128 224
WIRE 128 288 0 288
WIRE 176 288 176 240
WIRE 176 288 128 288
WIRE -592 304 -592 288
WIRE -160 304 -160 288
WIRE -48 352 -48 -80
WIRE -48 352 -128 352
WIRE 0 352 -48 352
WIRE 32 352 0 352
WIRE 128 352 128 288
WIRE 128 352 112 352
WIRE 208 368 208 304
WIRE 336 368 208 368
WIRE -128 400 -128 352
WIRE -208 448 -208 288
WIRE -64 448 -208 448
WIRE 144 496 144 176
WIRE 208 496 208 368
WIRE 208 496 144 496
WIRE -16 528 -16 224
WIRE -16 528 -48 528
WIRE 208 528 208 496
WIRE 208 528 160 528
WIRE -128 576 -128 496
WIRE 32 576 -128 576
WIRE 96 576 32 576
WIRE -48 640 -48 528
WIRE 32 640 32 576
WIRE 160 640 160 624
WIRE 160 656 160 640
WIRE 288 656 160 656
WIRE -48 720 -128 720
WIRE 32 720 -48 720
WIRE 160 720 32 720
WIRE 272 720 272 416
WIRE 272 720 160 720
WIRE 288 720 272 720
WIRE 640 720 640 704
WIRE 640 720 288 720
FLAG -592 384 0
FLAG 640 -64 0
FLAG 640 624 0
FLAG 0 144 0
FLAG 0 432 0
FLAG -160 224 0
FLAG 816 192 0
SYMBOL pnp -64 496 R180
SYMATTR InstName Q1
SYMATTR Value 2N3906
SYMBOL pnp 192 64 R180
SYMATTR InstName Q2
SYMATTR Value 2N3906
SYMBOL npn -144 128 R0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL npn 96 528 R0
SYMATTR InstName Q4
SYMATTR Value 2N3904
SYMBOL res 112 -176 R0
SYMATTR InstName R1
SYMATTR Value 150
SYMBOL res 144 624 R0
SYMATTR InstName R2
SYMATTR Value 150
SYMBOL res 16 624 R0
SYMATTR InstName R3
SYMATTR Value 470
SYMBOL res 16 -176 R0
SYMATTR InstName R4
SYMATTR Value 470
SYMBOL res -64 -176 R0
SYMATTR InstName R5
SYMATTR Value 2k
SYMBOL res -64 624 R0
SYMATTR InstName R6
SYMATTR Value 2k
SYMBOL res 128 208 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R7
SYMATTR Value 5k
SYMBOL res 128 336 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R8
SYMATTR Value 5k
SYMBOL voltage 640 -160 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage -592 288 R0
WINDOW 123 24 160 Left 0
WINDOW 39 24 132 Left 0
SYMATTR Value2 AC 1
SYMATTR SpiceLine Rser=1k
SYMATTR InstName V2
SYMATTR Value PULSE(-1 1 100n 2n 2n 300n)
SYMBOL voltage 640 608 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 12
SYMBOL res -16 128 R0
SYMATTR InstName R9
SYMATTR Value 1k
SYMBOL res -16 336 R0
SYMATTR InstName R10
SYMATTR Value 1k
SYMBOL cap -96 224 R0
SYMATTR InstName C1
SYMATTR Value 39p
SYMBOL cap -144 288 R0
SYMATTR InstName C2
SYMATTR Value 39p
SYMBOL cap -16 288 R0
SYMATTR InstName C3
SYMATTR Value 2p
SYMBOL cap -16 224 R0
SYMATTR InstName C4
SYMATTR Value 2p
SYMBOL res -176 208 R0
SYMATTR InstName R11
SYMATTR Value 47
SYMBOL res 608 176 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R12
SYMATTR Value {Rout}
SYMBOL res 832 176 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R13
SYMATTR Value 51
SYMBOL cap 224 -144 R0
SYMATTR InstName C5
SYMATTR Value 100p
SYMBOL cap 272 656 R0
SYMATTR InstName C6
SYMATTR Value 100p
SYMBOL npn 208 64 R0
SYMATTR InstName Q5
SYMATTR Value 2N3904
SYMBOL pnp 336 416 R180
SYMATTR InstName Q6
SYMATTR Value 2N3906
SYMBOL res 256 144 R0
SYMATTR InstName R14
SYMATTR Value 10
SYMBOL res 256 224 R0
SYMATTR InstName R15
SYMATTR Value 10
SYMBOL res 192 208 R0
SYMATTR InstName R16
SYMATTR Value 180
SYMBOL cap 128 112 R0
SYMATTR InstName C7
SYMATTR Value 100n
TEXT -624 736 Left 0 !.tran 0 500n 50n
TEXT 448 464 Left 0 !.step param rout list 10k, 510