Version 4
SHEET 1 1656 748
WIRE 384 -176 192 -176
WIRE 528 -176 384 -176
WIRE 752 -176 528 -176
WIRE 752 -128 752 -176
WIRE 192 -16 192 -176
WIRE 528 0 528 -176
WIRE 752 16 752 -48
WIRE 192 96 192 64
WIRE 224 96 192 96
WIRE 528 96 528 80
WIRE 528 96 496 96
WIRE 192 144 192 96
WIRE 528 144 528 96
WIRE -32 192 -112 192
WIRE 32 192 -32 192
WIRE 96 192 32 192
WIRE 128 192 96 192
WIRE 608 192 592 192
WIRE 656 192 608 192
WIRE -112 240 -112 192
WIRE 32 240 32 192
WIRE -32 256 -32 192
WIRE -32 256 -64 256
WIRE -32 304 -64 304
WIRE 192 304 192 240
WIRE 368 304 192 304
WIRE 400 304 368 304
WIRE 528 304 528 240
WIRE 528 304 400 304
WIRE -32 368 -32 304
WIRE 32 368 32 320
WIRE 32 368 -32 368
WIRE 656 368 656 192
WIRE 656 368 32 368
WIRE -112 384 -112 320
WIRE 368 416 368 304
WIRE 544 576 544 544
WIRE 368 704 368 496
WIRE 432 704 368 704
WIRE 544 704 544 656
WIRE 544 704 432 704
FLAG 752 16 0
FLAG -112 384 0
FLAG 224 96 Vc1
IOPIN 224 96 Out
FLAG 384 -176 vcc
FLAG 544 544 0
FLAG 496 96 Vc2
IOPIN 496 96 Out
FLAG 96 192 b1
FLAG 608 192 b2
FLAG 400 304 e
FLAG 432 704 Vee
SYMBOL npn 128 144 R0
SYMATTR InstName Q1
SYMATTR Value qNPN
SYMBOL res 176 -32 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL voltage 752 -144 R0
SYMATTR InstName Vcc
SYMATTR Value 10V
SYMBOL npn 592 144 M0
WINDOW 0 59 36 Left 2
SYMATTR InstName Q2
SYMATTR Value qNPN
SYMBOL res 512 -16 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL current 368 416 R0
SYMATTR InstName I1
SYMATTR Value 1mA
SYMBOL voltage 544 672 R180
WINDOW 0 24 96 Left 2
WINDOW 3 24 16 Left 2
SYMATTR InstName Vee
SYMATTR Value -10V
SYMBOL e -112 224 M0
SYMATTR InstName E1
SYMATTR Value 0.5
SYMBOL voltage 32 224 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vid
SYMATTR Value SINE(0 {amp} 1k)
TEXT 968 -160 Left 2 !.param amp=1m\n.step param amp list 0.5m 1m 17m 50m 100m 1\n.model qnpn npn()
TEXT 968 -16 Left 2 !.tran 1u 10m 0 1u\n.four 1k v([vc2,vc1])