Version 4
SHEET 1 996 680
WIRE 16 -48 -256 -48
WIRE 112 -48 16 -48
WIRE 16 -32 16 -48
WIRE 112 0 112 -48
WIRE -384 112 -416 112
WIRE -256 112 -256 -48
WIRE -224 112 -256 112
WIRE -96 112 -128 112
WIRE 48 112 -16 112
WIRE 112 112 112 80
WIRE 192 112 112 112
WIRE 496 112 272 112
WIRE 624 112 496 112
WIRE 928 112 624 112
WIRE 496 128 496 112
WIRE -416 144 -416 112
WIRE 112 144 112 112
WIRE 928 144 928 112
WIRE 624 176 624 112
WIRE 48 192 48 112
WIRE -304 208 -304 112
WIRE -176 208 -176 176
WIRE -176 208 -304 208
WIRE 496 240 496 192
WIRE 192 320 -192 320
WIRE 496 320 272 320
WIRE 624 320 624 240
WIRE 624 320 496 320
WIRE 928 320 624 320
WIRE 928 352 928 320
WIRE -192 368 -192 320
WIRE 496 384 496 320
WIRE 496 464 496 448
FLAG -416 224 0
FLAG -192 448 0
FLAG 16 48 0
FLAG 112 240 0
FLAG 496 464 0
FLAG 496 240 0
FLAG 928 432 0
FLAG 928 224 0
SYMBOL voltage -192 352 R0
WINDOW 3 -144 138 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value PULSE(0 5 0 10n 10n 2.5u 5u 20)
SYMATTR InstName V1
SYMBOL voltage -416 128 R0
WINDOW 3 -175 147 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value PULSE(0 5 4u 10n 10n 11u 22u 10)
SYMATTR InstName V2
SYMBOL cap 608 176 R0
SYMATTR InstName C1
SYMATTR Value 100p
SYMBOL cap 480 384 R0
SYMATTR InstName C2
SYMATTR Value 100p
SYMBOL res 96 -16 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL voltage 16 -48 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 5
SYMBOL npn 48 144 R0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL res -288 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL pnp -128 176 M270
SYMATTR InstName Q2
SYMATTR Value BC557C
SYMBOL res 288 304 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 100
SYMBOL cap 480 128 R0
SYMATTR InstName C3
SYMATTR Value 100p
SYMBOL res 912 128 R0
SYMATTR InstName R5
SYMATTR Value 20k
SYMBOL res 912 336 R0
SYMATTR InstName R6
SYMATTR Value 20k
SYMBOL res 0 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 1k
SYMBOL res 288 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 100
TEXT 360 296 Left 2 ;SCK
TEXT 352 96 Left 2 ;SDA
TEXT -192 520 Left 2 !.tran 100u
TEXT 640 280 Left 2 ;Wire capacities
TEXT 896 80 Left 2 ;Slave
TEXT 192 40 Left 2 ;Master
TEXT 120 -16 Left 2 ;pull-up
TEXT -112 184 Left 2 ;Inverter