Version 4
SHEET 1 880 692
WIRE 480 -128 480 -160
WIRE 416 -80 368 -80
WIRE -64 -32 -64 -64
WIRE 480 0 480 -32
WIRE 368 32 368 -80
WIRE -560 48 -560 0
WIRE -64 80 -64 48
WIRE -64 80 -128 80
WIRE -128 112 -128 80
WIRE -64 112 -64 80
WIRE 480 112 480 80
WIRE 640 112 480 112
WIRE 480 144 480 112
WIRE 640 144 640 112
WIRE 368 160 368 112
WIRE 368 160 320 160
WIRE -560 176 -560 128
WIRE -64 224 -64 192
WIRE 480 256 480 224
WIRE 640 256 640 224
WIRE 368 304 368 160
WIRE 416 304 368 304
WIRE 480 384 480 352
FLAG 480 -160 V+
FLAG 640 256 0
FLAG -64 224 V-
FLAG -64 -64 V+
FLAG -128 112 0
FLAG -560 176 0
FLAG 480 384 V-
FLAG -560 0 Sig
FLAG 320 160 Sig
SYMBOL npn2 416 -128 R0
SYMATTR InstName Q1
SYMATTR Value TIP3055
SYMBOL res 464 -16 R0
SYMATTR InstName R1
SYMATTR Value .1
SYMBOL res 624 128 R0
SYMATTR InstName R3
SYMATTR Value {R}
SYMBOL voltage -64 -48 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 18
SYMBOL voltage -64 96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 18
SYMBOL voltage -560 32 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value SINE({-Vb/2} {Vpeak} {f})
SYMBOL res 464 128 R0
SYMATTR InstName R2
SYMATTR Value .1
SYMBOL pnp2 416 352 M180
SYMATTR InstName Q2
SYMATTR Value TIP2955
SYMBOL voltage 368 16 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value {Vb}
TEXT -504 -120 Left 0 !.tran 1
TEXT -616 312 Left 0 !*  NSC TO-220\n.MODEL TIP2955     PNP(Is=66.19f Xti=3 Eg=1.11 Vaf=100 Bf=137.6 Ise=862.2f\n+   Ne=1.481 Ikf=1.642 Nk=.5695 Xtb=2 Br=5.88 Isc=273.5f Nc=1.24\n+   Ikr=3.555 Rc=79.39m Cjc=870.4p Mjc=.6481 Vjc=.75 Fc=.5\n+   Cje=390.1p Mje=.4343 Vje=.75 Tr=235.4n Tf=23.21n Itf=71.33\n+   Xtf=5.982 Vtf=10 Rb=.1)\n*  NSC TO-220\n.MODEL TIP3055     NPN(Is=457.5f Xti=3 Eg=1.11 Vaf=50 Bf=156.7 Ise=1.346p Ne=1.3\n+   Ikf=3.296 Nk=.5961 Xtb=2.2 Br=7.639 Isc=604.1f Nc=2.168\n+   Ikr=8.131m Rc=91.29m Cjc=278.7p Mjc=.385 Vjc=.75 Fc=.5 Cje=433p\n+   Mje=.5 Vje=.75 Tr=1.412u Tf=37.34n Itf=35.68 Xtf=1.163 Vtf=10\n+   Rb=.1)
TEXT -504 -152 Left 0 !.param Vb=1.3 R=8 Vpeak=13.2 f=1000