Version 4
SHEET 1 880 680
WIRE 304 64 208 64
WIRE 432 64 304 64
WIRE 208 80 208 64
WIRE 160 96 -32 96
WIRE 304 160 304 64
WIRE 432 176 432 64
WIRE 208 208 208 176
WIRE 240 208 208 208
WIRE -32 272 -32 96
WIRE -16 272 -32 272
WIRE 80 272 64 272
WIRE 96 272 80 272
WIRE 192 272 176 272
WIRE 208 272 192 272
WIRE 304 272 304 256
WIRE 304 272 288 272
WIRE -32 288 -32 272
WIRE 80 288 80 272
WIRE 192 288 192 272
WIRE 304 288 304 272
WIRE -32 384 -32 352
WIRE 80 384 80 352
WIRE 192 384 192 352
WIRE 304 384 304 368
WIRE 432 384 432 256
FLAG 304 384 0
FLAG 432 384 0
FLAG 192 384 0
FLAG 80 384 0
FLAG -32 384 0
SYMBOL pmos 160 176 M180
SYMATTR InstName M1
SYMATTR Value Si4433DY
SYMBOL npn 240 160 R0
SYMATTR InstName Q1
SYMATTR Value BC547B
SYMBOL voltage 432 160 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL res 288 272 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res 304 256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL res 192 256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL res 80 256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL cap -48 288 R0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL cap 64 288 R0
SYMATTR InstName C2
SYMATTR Value 10n
SYMBOL cap 176 288 R0
SYMATTR InstName C3
SYMATTR Value 10n
TEXT -52 408 Left 2 !.tran 0 20m 0 10u