Version 4
SHEET 1 880 680
WIRE 208 64 -256 64
WIRE 208 112 208 64
WIRE -256 144 -256 64
WIRE -48 160 -80 160
WIRE 80 160 32 160
WIRE 144 160 80 160
WIRE 480 192 288 192
WIRE 608 192 560 192
WIRE -80 240 -80 160
WIRE 208 256 208 208
WIRE 288 256 288 192
WIRE 288 256 208 256
WIRE 400 256 288 256
WIRE 528 256 480 256
WIRE 80 288 80 160
WIRE 208 288 208 256
WIRE 288 320 288 256
WIRE 336 320 288 320
WIRE 448 320 416 320
WIRE 448 336 448 320
WIRE 528 336 528 256
WIRE 608 336 608 192
WIRE -256 416 -256 224
WIRE -80 416 -80 320
WIRE -80 416 -256 416
WIRE 80 416 80 368
WIRE 80 416 -80 416
WIRE 208 416 208 368
WIRE 208 416 80 416
WIRE 448 416 208 416
WIRE 528 416 448 416
WIRE 608 416 528 416
WIRE 80 432 80 416
FLAG 80 432 0
SYMBOL npn 144 112 R0
SYMATTR InstName Q1
SYMATTR Value BF199
SYMBOL res 192 272 R0
SYMATTR InstName R1
SYMATTR Value 150
SYMBOL res 576 176 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 75
SYMBOL res 496 240 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R3
SYMATTR Value 75
SYMBOL res 432 304 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 75
SYMBOL res 432 320 R0
SYMATTR InstName R5
SYMATTR Value 75
SYMBOL res 512 320 R0
SYMATTR InstName R6
SYMATTR Value 75
SYMBOL res 592 320 R0
SYMATTR InstName R7
SYMATTR Value 75
SYMBOL res -64 176 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R8
SYMATTR Value 470
SYMBOL res 64 272 R0
SYMATTR InstName R9
SYMATTR Value 560
SYMBOL voltage -256 128 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 132 Left 0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage -80 224 R0
WINDOW 3 -220 152 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 24 44 Left 0
SYMATTR Value PULSE(0 5 0 7n 7n 33n 80n)
SYMATTR SpiceLine Rser=35
SYMATTR InstName V2
TEXT 416 88 Left 0 !.tran 0 1u 800n