Version 4
SHEET 1 1784 680
WIRE 112 96 80 96
WIRE 224 96 192 96
WIRE 1232 96 1200 96
WIRE 1328 96 1312 96
WIRE 80 144 80 96
WIRE 1328 144 1328 96
WIRE -48 352 -48 224
WIRE 80 352 80 224
WIRE 80 352 -48 352
WIRE 288 352 288 144
WIRE 288 352 80 352
WIRE 1136 352 1136 144
WIRE 1136 352 288 352
WIRE 1328 352 1328 224
WIRE 1328 352 1136 352
WIRE 1456 352 1456 224
WIRE 1456 352 1328 352
WIRE -48 368 -48 352
FLAG -48 368 0
SYMBOL voltage -48 128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 3.3
SYMBOL voltage 1456 128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 1.8
SYMBOL voltage 80 128 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(0 1 0 10n 10n 200n 1µ)
SYMBOL npn 224 48 R0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL npn 1200 48 M0
SYMATTR InstName Q2
SYMATTR Value BC547C
SYMBOL res 208 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res 1328 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL voltage 1328 128 R0
WINDOW 3 24 96 Invisible 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value PULSE(0 1 500n 10n 10n 200n 1µ)
TEXT -82 392 Left 2 !.tran 10µ