Version 4
SHEET 1 996 680
WIRE 0 -48 -256 -48
WIRE 16 -48 0 -48
WIRE 112 -48 16 -48
WIRE 176 -48 112 -48
WIRE 368 -48 352 -48
WIRE 384 -48 368 -48
WIRE 496 -48 464 -48
WIRE 16 -32 16 -48
WIRE 112 -16 112 -48
WIRE 368 16 368 -48
WIRE 368 16 304 16
WIRE 176 80 176 -48
WIRE -384 112 -416 112
WIRE -256 112 -256 -48
WIRE -224 112 -256 112
WIRE -96 112 -128 112
WIRE 16 112 -16 112
WIRE 112 112 112 64
WIRE 112 112 80 112
WIRE 352 112 352 80
WIRE 352 112 112 112
WIRE 496 112 352 112
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 -16 192 -16 112
WIRE 48 192 -16 192
WIRE -304 208 -304 112
WIRE -176 208 -176 176
WIRE -176 208 -304 208
WIRE -16 208 -16 192
WIRE 336 240 336 224
WIRE 496 240 496 192
WIRE 336 320 272 320
WIRE 496 320 336 320
WIRE 624 320 624 240
WIRE 624 320 496 320
WIRE 928 320 624 320
WIRE 928 352 928 320
WIRE 96 384 96 320
WIRE 288 384 224 384
WIRE 496 384 496 320
WIRE 96 448 96 384
WIRE 288 448 288 384
WIRE 288 448 272 448
WIRE 304 448 288 448
WIRE 416 448 384 448
WIRE 496 464 496 448
FLAG -416 224 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
FLAG 928 320 scl
FLAG 928 112 sda
FLAG 496 -48 0
FLAG -16 288 0
FLAG 0 -48 +5v
FLAG 416 448 0
FLAG 96 384 +5v
FLAG 336 224 +5v
SYMBOL voltage -416 128 R0
WINDOW 3 -72 147 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 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 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 2k7
SYMBOL res 160 96 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R7
SYMATTR Value 100
SYMBOL res 160 -32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R9
SYMATTR Value 100
SYMBOL pnp 352 16 M270
SYMATTR InstName Q3
SYMATTR Value BC557C
SYMBOL pnp 352 16 R90
SYMATTR InstName Q4
SYMATTR Value BC557C
SYMBOL res 368 -32 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R10
SYMATTR Value 1k8
SYMBOL cap 80 96 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C4
SYMATTR Value 100p
SYMBOL res -32 192 R0
SYMATTR InstName R11
SYMATTR Value 1k
SYMBOL res 80 304 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 100
SYMBOL res 80 432 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R12
SYMATTR Value 100
SYMBOL pnp 272 384 R90
SYMATTR InstName Q5
SYMATTR Value BC557C
SYMBOL pnp 272 384 M270
SYMATTR InstName Q6
SYMATTR Value BC557C
SYMBOL res 288 432 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R13
SYMATTR Value 1k8
SYMBOL res 96 -32 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 320 224 R0
WINDOW 3 32 76 Left 2
SYMATTR InstName R14
SYMATTR Value 10k
TEXT 584 360 Left 2 ;SCK
TEXT 760 80 Left 2 ;SDA
TEXT -192 520 Left 2 !.tran 100u
TEXT 640 280 Left 2 ;Wire capacities
TEXT 896 80 Left 2 ;Slave
TEXT 248 216 Left 2 ;Master
TEXT -112 184 Left 2 ;Inverter