Version 4
SHEET 1 1392 696
WIRE 496 96 224 96
WIRE 736 96 496 96
WIRE 976 96 736 96
WIRE 1216 96 976 96
WIRE 224 128 224 96
WIRE 224 240 224 208
WIRE 496 240 496 96
WIRE 736 240 736 96
WIRE 976 240 976 96
WIRE 1216 240 1216 96
WIRE 400 288 224 288
WIRE 448 288 400 288
WIRE 688 288 640 288
WIRE 928 288 880 288
WIRE 1168 288 1120 288
WIRE 400 320 352 320
WIRE 448 320 400 320
WIRE 688 320 640 320
WIRE 928 320 880 320
WIRE 1168 320 1120 320
WIRE 224 352 224 288
WIRE 352 352 352 320
WIRE 224 464 224 432
WIRE 352 464 352 432
WIRE 496 464 496 336
WIRE 736 464 736 336
WIRE 976 464 976 336
WIRE 1216 464 1216 336
FLAG 224 240 0
FLAG 352 464 0
FLAG 224 464 0
FLAG 496 464 0
FLAG 976 464 0
FLAG 880 288 g2
FLAG 880 320 g1
FLAG 400 288 g2
FLAG 400 320 g1
FLAG 736 464 0
FLAG 640 288 g2
FLAG 640 320 g1
FLAG 496 96 d
FLAG 1216 464 0
FLAG 1120 288 g2
FLAG 1120 320 g1
SYMBOL voltage 352 336 R0
SYMATTR InstName V1
SYMATTR Value 0
SYMBOL voltage 224 112 R0
SYMATTR InstName V3
SYMATTR Value 10
SYMBOL voltage 224 336 R0
SYMATTR InstName V2
SYMATTR Value 4
SYMBOL xdgnmos 928 240 R0
SYMATTR InstName Q3
SYMATTR SpiceModel BF994S
SYMBOL xdgnmos 1168 240 R0
SYMATTR InstName Q4
SYMATTR SpiceModel BF981
SYMBOL Miscel\\dgnmos 448 240 R0
SYMATTR InstName U1
SYMBOL Miscel\\dgnmos 688 240 R0
SYMATTR InstName U2
SYMATTR SpiceModel BF998
TEXT 1024 120 Left 0 !.dc V1 -1 0.5 0.01