Version 4
SHEET 1 880 680
WIRE 224 48 160 48
WIRE 384 48 304 48
WIRE 160 128 160 48
WIRE 384 128 384 48
WIRE 96 176 16 176
WIRE 16 208 16 176
WIRE 160 256 160 224
WIRE 384 256 384 208
WIRE 16 304 16 288
FLAG 160 256 0
FLAG 384 256 0
FLAG 16 304 0
FLAG 160 48 CE
SYMBOL voltage 384 112 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PWL(0 0 1 10)
SYMBOL npn 96 128 R0
SYMATTR InstName Q1
SYMATTR Value BC547B
SYMBOL res 320 32 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName Rc
SYMATTR Value 100
SYMBOL current 16 288 R180
WINDOW 0 24 80 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName I1
SYMATTR Value {Ib}
TEXT 232 304 Left 2 !.tran 1s
TEXT -160 360 Left 2 !.step param Ib 50u 400u 50u