Version 4
SHEET 1 880 680
WIRE 400 -48 240 -48
WIRE 240 0 240 -48
WIRE 240 96 240 80
WIRE 240 96 224 96
WIRE 400 96 400 -48
WIRE 240 128 240 96
WIRE 16 176 -64 176
WIRE 112 176 96 176
WIRE 176 176 112 176
WIRE -64 192 -64 176
WIRE 112 192 112 176
WIRE 240 240 240 224
WIRE 256 240 240 240
WIRE -64 288 -64 272
WIRE 240 288 240 240
WIRE 240 288 -64 288
WIRE 400 288 400 176
WIRE 400 288 240 288
WIRE 240 320 240 288
FLAG 240 320 0
FLAG 224 96 collector
FLAG 112 192 base
FLAG 256 240 emitter
SYMBOL Misc\\battery 400 80 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL res 224 -16 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL voltage -64 176 R0
WINDOW 3 -44 133 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PWL(0 0 .1 1.0)
SYMATTR InstName V2
SYMBOL res 112 160 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL npn 176 128 R0
SYMATTR InstName Q2
SYMATTR Value 2N3904
TEXT 272 -72 Left 0 !.tran 0 0.1 0 .0001
TEXT -160 -8 Left 0 ;Base voltage vs collector current