Version 4
SHEET 1 880 680
WIRE 96 -80 -16 -80
WIRE 288 -80 96 -80
WIRE -16 80 -16 -80
WIRE 288 112 288 -80
WIRE 224 160 160 160
WIRE 96 208 96 -80
WIRE 288 240 288 208
WIRE 160 320 160 256
WIRE 288 336 288 320
WIRE -16 432 -16 160
WIRE 160 432 160 400
WIRE 160 432 -16 432
WIRE 288 432 288 416
WIRE 288 432 160 432
WIRE 160 480 160 432
FLAG 160 480 0
SYMBOL pnp 224 112 R0
SYMATTR InstName Q1
SYMATTR Value 2N3906
SYMBOL Misc\\battery 288 320 R0
WINDOW 0 24 104 Left 0
WINDOW 3 24 16 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL res 272 224 R0
SYMATTR InstName R1
SYMATTR Value 1000
SYMBOL voltage -16 64 R0
WINDOW 3 -155 113 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PWL(0 0 .1 5)
SYMATTR InstName V2
SYMBOL npn 96 160 R0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL res 144 304 R0
SYMATTR InstName R3
SYMATTR Value 100k
TEXT 0 408 Left 0 !.tran 0.1
TEXT -56 -160 Left 0 ;Plot V2 vs current thru R1
TEXT -56 -120 Left 0 ;Note that current is not monotonic in V2.