Version 4
SHEET 1 880 680
WIRE 192 -32 0 -32
WIRE 384 -32 384 -64
WIRE 384 -32 192 -32
WIRE 0 0 0 -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 -208 224 -352 224
WIRE -96 224 -208 224
WIRE 0 224 0 80
WIRE 0 224 -32 224
WIRE 384 224 384 192
WIRE 192 288 192 144
WIRE -112 336 -352 336
WIRE -96 336 -112 336
WIRE 0 336 0 224
WIRE 0 336 -32 336
WIRE 32 336 0 336
WIRE 128 336 96 336
WIRE 384 352 384 288
WIRE 496 352 384 352
WIRE 384 368 384 352
WIRE 192 416 192 384
WIRE 320 416 192 416
WIRE 192 448 192 416
WIRE -208 464 -208 224
WIRE -112 464 -112 336
WIRE -688 496 -688 464
WIRE -592 496 -592 464
WIRE -592 496 -688 496
WIRE -496 496 -496 464
WIRE -496 496 -592 496
WIRE -592 512 -592 496
WIRE -208 560 -208 528
WIRE -112 560 -112 528
WIRE -112 560 -208 560
WIRE 192 560 192 528
WIRE 192 560 -112 560
WIRE 384 560 384 464
WIRE 384 560 192 560
WIRE 384 592 384 560
FLAG 384 592 0
FLAG -352 224 A
FLAG -352 336 B
FLAG 496 352 Y
FLAG -592 512 0
FLAG -688 384 A
FLAG -592 384 B
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 -592 368 R0
WINDOW 3 -4 -511 VRight 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0V 5V 2ms 1ns 1ns 2ms 4ms)
SYMATTR InstName Vb
SYMBOL voltage -496 368 R0
WINDOW 3 -3 -114 VRight 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value +5V
SYMATTR InstName Vb1
SYMBOL npn 128 288 R0
WINDOW 3 56 68 Invisible 0
WINDOW 0 37 47 Left 0
SYMATTR Value 2N2222
SYMATTR InstName Q2
SYMBOL npn 320 96 R0
WINDOW 3 56 68 Invisible 0
WINDOW 0 35 49 Left 0
SYMATTR Value 2N2222
SYMATTR InstName Q4
SYMBOL npn 320 368 R0
WINDOW 3 56 68 Invisible 0
WINDOW 0 36 51 Left 0
SYMATTR Value 2N2222
SYMATTR InstName Q3
SYMBOL res -16 -16 R0
WINDOW 0 36 40 Invisible 0
SYMATTR InstName R1
SYMATTR Value 3.6K
SYMBOL res 176 -16 R0
WINDOW 0 36 40 Invisible 0
SYMATTR InstName R2
SYMATTR Value 1.6K
SYMBOL res 368 -16 R0
WINDOW 0 36 40 Invisible 0
SYMATTR InstName R3
SYMATTR Value 115
SYMBOL res 176 432 R0
WINDOW 0 36 40 Invisible 0
SYMATTR InstName R4
SYMATTR Value 3K
SYMBOL diode 368 224 R0
WINDOW 0 24 0 Invisible 0
WINDOW 3 24 72 Invisible 0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL diode 32 320 M90
WINDOW 0 0 32 Invisible 0
WINDOW 3 32 32 Invisible 0
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL diode -32 320 R90
WINDOW 0 0 32 Invisible 0
WINDOW 3 32 32 Invisible 0
SYMATTR InstName D3
SYMATTR Value 1N914
SYMBOL diode -32 208 R90
WINDOW 0 0 32 Invisible 0
WINDOW 3 32 32 Invisible 0
SYMATTR InstName D4
SYMATTR Value 1N914
SYMBOL diode -96 528 R180
WINDOW 0 24 72 Invisible 0
WINDOW 3 24 0 Invisible 0
SYMATTR InstName D5
SYMATTR Value 1N914
SYMBOL diode -192 528 R180
WINDOW 0 24 72 Invisible 0
WINDOW 3 24 0 Invisible 0
SYMATTR InstName D6
SYMATTR Value 1N914
TEXT -720 600 Left 0 !.tran 10ms