Version 4
SHEET 1 1944 680
WIRE 560 -304 368 -304
WIRE 368 -240 368 -304
WIRE 192 -128 144 -128
WIRE 368 -128 368 -160
WIRE 368 -128 272 -128
WIRE 368 -80 368 -128
WIRE 560 -80 560 -304
WIRE 144 -32 144 -128
WIRE 144 -32 48 -32
WIRE 304 -32 144 -32
WIRE 144 0 144 -32
WIRE 48 48 48 -32
WIRE 80 48 48 48
WIRE 144 128 144 96
WIRE 368 128 368 16
WIRE 144 240 144 208
WIRE 368 240 368 208
WIRE 368 240 144 240
WIRE 560 240 560 0
WIRE 560 240 368 240
WIRE 368 288 368 240
FLAG 368 288 0
SYMBOL npn 304 -80 R0
SYMATTR InstName Q1
SYMATTR Value BU508A
SYMBOL Misc\\EuropeanResistor 352 -256 R0
SYMATTR InstName R1
SYMATTR Value 2K
SYMBOL Misc\\EuropeanResistor 288 -144 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 50K
SYMBOL voltage 560 -96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 36 42 Left 2
SYMATTR SpiceLine Rser=0
SYMATTR InstName V1
SYMATTR Value 250
SYMBOL Misc\\EuropeanResistor 352 112 R0
SYMATTR InstName R3
SYMATTR Value 10R
SYMBOL Misc\\EuropeanResistor 128 112 R0
SYMATTR InstName R4
SYMATTR Value 100R
SYMBOL npn 80 0 R0
SYMATTR InstName Q2
SYMATTR Value BC547B
TEXT -40 360 Left 2 !.tran 0 1 0 0.1
TEXT 968 176 Left 2 !.model BU508A   NPN(Is=148.5p Xti=3 Eg=1.11 Vaf=100 Bf=43.23 Ise=1.355n\n+               Ne=1.413 Ikf=8.245 Nk=.8069 Xtb=1.75 Br=2.131 Isc=529.1p\n+               Nc=1.567 Ikr=1.689 Rc=32.64m Cjc=303.6p Mjc=.3333 Vjc=.5 Fc=.5\n+               Cje=910.8p Mje=.3333 Vje=.5 Tr=16.1u Tf=22.02n Itf=183.6\n+               Xtf=18.91K Vtf=10)\n*                               TELEFUNKEN      pid=bu508       case=TOP3\n*                               91-08-14 dsq