Version 4
SHEET 1 988 680
WIRE 368 16 176 16
WIRE 176 112 176 96
WIRE 224 112 176 112
WIRE 240 112 224 112
WIRE 176 128 176 112
WIRE 240 128 240 112
WIRE 368 128 368 16
WIRE -288 176 -400 176
WIRE 112 176 -208 176
WIRE -400 208 -400 176
WIRE 176 240 176 224
WIRE 240 240 240 208
WIRE 240 240 176 240
WIRE 368 240 368 208
WIRE 368 240 240 240
WIRE 176 256 176 240
WIRE -400 320 -400 288
FLAG -400 320 0
FLAG 176 256 0
FLAG 224 112 Vout
FLAG 368 16 Vcc
SYMBOL voltage -400 192 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 43 63 Left 2
SYMATTR Value PULSE(0 5 0.1 0.01 0.01 0.1 0.2 5)
SYMATTR InstName V3
SYMBOL res 224 224 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName RL
SYMATTR Value {RL}
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL voltage 368 112 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 5v
SYMBOL res 160 0 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL npn 112 128 R0
SYMATTR InstName Q1
SYMATTR Value BC549C
SYMBOL res -304 192 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 1k
TEXT -320 344 Left 2 !.tran 1
TEXT 88 296 Left 2 !.step param RL 0.1k 1k 0.1k