Version 4
SHEET 1 1668 816
WIRE -400 -64 -640 -64
WIRE -208 -64 -400 -64
WIRE 48 -64 -112 -64
WIRE 352 -64 128 -64
WIRE 352 144 352 -64
WIRE -400 176 -400 -64
WIRE -320 176 -400 176
WIRE -160 176 -160 0
WIRE -160 176 -240 176
WIRE -640 192 -640 -64
WIRE -160 224 -160 176
WIRE -160 240 -160 224
WIRE -160 304 -160 288
WIRE -640 464 -640 272
WIRE -160 464 -160 432
WIRE 352 480 352 224
FLAG -640 464 0
FLAG 352 480 0
FLAG -160 464 0
DATAFLAG -240 -64 ""
DATAFLAG -80 -64 ""
DATAFLAG -160 176 ""
SYMBOL npn -208 0 R270
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL Misc\\EuropeanResistor 32 -48 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 0.1
SYMBOL voltage -640 176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName Vin
SYMATTR Value 12V
SYMBOL Misc\\EuropeanResistor -336 192 R270
WINDOW 0 27 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName R8
SYMATTR Value 40kk
SYMBOL diode -144 304 M0
SYMATTR InstName D1
SYMBOL diode -144 368 M0
SYMATTR InstName D2
SYMBOL diode -144 224 M0
SYMATTR InstName D3
SYMBOL Misc\\EuropeanResistor 336 128 R0
SYMATTR InstName R_LOAD
SYMATTR Value {Rx}
TEXT -400 -344 Left 2 ;https://www.mikrocontroller.net/topic/465727#5679489
TEXT 144 -56 VLeft 2 ;Ic(Q1)
TEXT 488 184 Left 4 !.step param Rx  list 2k 1k 100  0.00000001
TEXT -544 592 Left 2 !.tran 0 10m 0 1u
TEXT -544 640 Left 2 !.options plotwinsize=0
TEXT -448 232 Left 5 ;IN
TEXT 56 232 Left 5 ;OUT
TEXT 352 -136 Left 2 ;[ALT] + l. Maus click -> Angabe der Leistung  im Display
RECTANGLE Normal 240 544 -544 -224 2