Version 4
SHEET 1 880 680
WIRE 192 -32 32 -32
WIRE 384 -32 384 -64
WIRE 384 -32 192 -32
WIRE 32 0 32 -32
WIRE 192 0 192 -32
WIRE 384 0 384 -32
WIRE 384 96 384 80
WIRE 192 144 192 80
WIRE 320 144 192 144
WIRE 384 240 384 192
WIRE 32 272 32 80
WIRE 192 288 192 144
WIRE -80 336 -192 336
WIRE -16 336 -80 336
WIRE 128 336 80 336
WIRE 384 352 384 304
WIRE 496 352 384 352
WIRE 384 368 384 352
WIRE 192 416 192 384
WIRE 320 416 192 416
WIRE -80 448 -80 336
WIRE 192 448 192 416
WIRE -688 496 -688 464
WIRE -592 496 -688 496
WIRE -496 496 -496 464
WIRE -496 496 -592 496
WIRE -592 512 -592 496
WIRE -80 560 -80 512
WIRE 192 560 192 528
WIRE 192 560 -80 560
WIRE 384 560 384 464
WIRE 384 560 192 560
WIRE 384 592 384 560
FLAG 384 592 0
FLAG -192 336 A
FLAG 496 352 Y
FLAG -592 512 0
FLAG -688 384 A
FLAG -496 384 +5V
FLAG 384 -64 +5V
SYMBOL voltage -688 368 R0
WINDOW 3 2 -509 VRight 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0V 5V 1ms 1ns 1ns 1ms 2ms)
SYMATTR InstName Va
SYMBOL voltage -496 368 R0
WINDOW 3 -3 -114 VRight 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 24 16 Invisible 0
SYMATTR Value +5V
SYMATTR InstName Vcc
SYMBOL npn 128 288 R0
WINDOW 3 56 68 Invisible 0
WINDOW 0 36 52 Left 0
SYMATTR Value 2N2222
SYMATTR InstName Q2
SYMBOL npn 320 96 R0
WINDOW 3 56 68 Invisible 0
WINDOW 0 43 52 Left 0
SYMATTR Value 2N2222
SYMATTR InstName Q4
SYMBOL npn 320 368 R0
WINDOW 3 56 68 Invisible 0
WINDOW 0 41 46 Left 0
SYMATTR Value 2N2222
SYMATTR InstName Q3
SYMBOL res 16 -16 R0
WINDOW 0 36 40 Invisible 0
WINDOW 3 37 69 Left 0
SYMATTR InstName R1
SYMATTR Value 3.6K
SYMBOL res 176 -16 R0
WINDOW 0 36 40 Invisible 0
WINDOW 3 37 67 Left 0
SYMATTR InstName R2
SYMATTR Value 1.6K
SYMBOL res 368 -16 R0
WINDOW 0 36 40 Invisible 0
WINDOW 3 37 70 Left 0
SYMATTR InstName R3
SYMATTR Value 115
SYMBOL res 176 432 R0
WINDOW 0 36 40 Invisible 0
WINDOW 3 38 63 Left 0
SYMATTR InstName R4
SYMATTR Value 1K
SYMBOL diode -64 512 R180
WINDOW 0 -45 29 Left 0
WINDOW 3 24 0 Invisible 0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL diode 368 240 R0
WINDOW 3 24 72 Invisible 0
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL npn 80 272 R90
WINDOW 3 56 68 Invisible 0
WINDOW 0 34 46 Left 0
SYMATTR Value 2N2222
SYMATTR InstName Q1
TEXT -720 600 Left 0 !.tran 10ms