Version 4
SHEET 1 880 680
WIRE 400 -240 64 -240
WIRE 400 -192 400 -240
WIRE 64 -176 64 -240
WIRE 256 -80 224 -80
WIRE 400 -80 400 -112
WIRE 400 -80 336 -80
WIRE 80 -32 64 -32
WIRE 400 -32 400 -80
WIRE 528 -32 400 -32
WIRE 608 -32 528 -32
WIRE 64 0 64 -32
WIRE 400 16 400 -32
WIRE 128 64 80 64
WIRE 224 64 224 16
WIRE 224 64 128 64
WIRE 256 64 224 64
WIRE 80 128 80 64
FLAG 80 288 0
FLAG 64 -96 0
FLAG 400 112 0
FLAG 64 0 0
FLAG 528 -32 out
FLAG 128 64 in
SYMBOL voltage 80 112 R0
WINDOW 3 50 57 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0 1.1 0 10n 10n 10m 100m)
SYMBOL voltage 64 -192 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 18
SYMBOL voltage 80 192 R0
WINDOW 3 43 63 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(0 -1.1 50m 10n 10n 10m 100m)
SYMBOL npn 336 16 R0
SYMATTR InstName Q1
SYMATTR Value BC337-40
SYMBOL npn 160 -80 R0
SYMATTR InstName Q2
SYMATTR Value BC337-40
SYMBOL res 352 48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL res 176 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 100k
SYMBOL res 384 -208 R0
SYMATTR InstName R3
SYMATTR Value 1Meg
SYMBOL res 352 -96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 47k
TEXT 182 288 Left 2 !.tran 1