Version 4
SHEET 1 1216 680
WIRE 384 -176 192 -176
WIRE 576 -176 384 -176
WIRE 576 -112 576 -176
WIRE 192 -16 192 -176
WIRE 576 16 576 -32
WIRE 192 96 192 64
WIRE 448 96 192 96
WIRE 192 144 192 96
WIRE 64 192 -96 192
WIRE 128 192 64 192
WIRE -96 256 -96 192
WIRE 192 304 192 240
WIRE -96 416 -96 336
WIRE -96 528 -96 496
FLAG 192 304 0
FLAG 576 16 0
FLAG -96 528 0
FLAG 448 96 vc
IOPIN 448 96 Out
FLAG 384 -176 vcc
FLAG 64 192 b
SYMBOL npn 128 144 R0
SYMATTR InstName Q1
SYMATTR Value qNPN
SYMBOL res 176 -32 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL voltage 576 -128 R0
SYMATTR InstName Vcc
SYMATTR Value 10V
SYMBOL voltage -96 240 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName VBEsin
SYMATTR Value SINE(0 {amp} 1k)
SYMBOL voltage -96 400 R0
SYMATTR InstName VBEconst
SYMATTR Value 0.77425
TEXT 624 136 Left 2 !.param amp=1m\n.step param amp list 0.1m 1m 2m 10m 20m 40m 80m\n.model qnpn npn()
TEXT 624 304 Left 2 !.tran 1u 10m 0 1u\n.four 1k v([vc])\n*.options vntol=1e-9 reltol=1e-9\n*.ac dec 100 1 1g