Version 4
SHEET 1 1080 680
WIRE 80 -32 -48 -32
WIRE 272 -32 80 -32
WIRE -48 0 -48 -32
WIRE 80 0 80 -32
WIRE 272 0 272 -32
WIRE -48 112 -48 80
WIRE 80 112 80 80
WIRE 272 112 272 80
WIRE 176 160 144 160
WIRE 208 160 176 160
WIRE 80 240 80 208
WIRE 176 240 176 160
WIRE 176 240 80 240
WIRE 272 240 272 208
WIRE 352 240 272 240
WIRE 448 240 416 240
WIRE 544 240 448 240
WIRE 272 256 272 240
WIRE 80 272 80 240
WIRE 544 272 544 240
WIRE 272 288 272 256
WIRE 448 288 448 240
WIRE 80 384 80 352
WIRE 272 384 272 352
WIRE 448 384 448 352
WIRE 544 384 544 352
FLAG 80 384 0
FLAG 272 384 0
FLAG -48 112 0
FLAG 272 256 scl
FLAG 544 384 0
FLAG 448 384 0
SYMBOL pnp 144 208 R180
SYMATTR InstName Q1
SYMATTR Value BC557C
SYMBOL pnp 208 208 M180
SYMATTR InstName Q2
SYMATTR Value BC557C
SYMBOL res 256 -16 R0
SYMATTR InstName R1
SYMATTR Value 47R
SYMBOL res 64 -16 R0
SYMATTR InstName R2
SYMATTR Value 220R
SYMBOL res 64 256 R0
SYMATTR InstName R3
SYMATTR Value 6k8
SYMBOL cap 256 288 R0
SYMATTR InstName C1
SYMATTR Value 200p
SYMBOL voltage -48 -16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 124 Left 2
SYMATTR InstName V1
SYMATTR Value 5
SYMATTR SpiceLine Rser=1m
SYMBOL current 544 272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName I1
SYMATTR Value PULSE(0 3m 20u 100n 100n 4u5 10u 9)
SYMBOL diode 352 256 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMBOL diode 464 352 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
TEXT -82 408 Left 2 !.tran 110u
TEXT 224 208 VRight 2 !.ic V(scl)=0