Version 4
SHEET 1 880 816
WIRE 224 -288 112 -288
WIRE 416 -288 304 -288
WIRE 496 -288 416 -288
WIRE 496 -224 496 -288
WIRE 112 -160 112 -288
WIRE 240 -160 112 -160
WIRE 416 -160 416 -288
WIRE 416 -160 288 -160
WIRE 112 -112 -176 -112
WIRE 224 -112 112 -112
WIRE 416 -112 304 -112
WIRE 512 -112 416 -112
WIRE 688 -112 512 -112
WIRE 112 64 112 -112
WIRE 288 64 112 64
WIRE 416 64 416 -112
WIRE 416 64 384 64
WIRE 112 192 112 64
WIRE -176 272 -176 -112
WIRE 688 320 688 -112
WIRE 112 336 112 272
WIRE 192 336 112 336
WIRE 304 336 304 112
WIRE 304 336 192 336
WIRE 512 368 512 -112
WIRE 304 432 304 336
WIRE 512 480 512 448
WIRE 512 480 368 480
WIRE 512 544 512 480
WIRE -176 688 -176 352
WIRE 304 688 304 528
WIRE 304 688 -176 688
WIRE 512 688 512 624
WIRE 512 688 304 688
WIRE 688 688 688 400
WIRE 688 688 512 688
WIRE 304 752 304 688
FLAG 304 752 0
FLAG 496 -224 0
FLAG 192 336 G
SYMBOL pmos 384 112 M270
SYMATTR InstName M1
SYMATTR Value IRF7204
SYMBOL npn 368 432 M0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL Misc\\EuropeanResistor 96 176 R0
SYMATTR InstName R1
SYMATTR Value 22K
SYMBOL sw 320 -112 R90
SYMATTR InstName S1
SYMBOL voltage 208 -288 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 -32 56 VBottom 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(-1 1 0 0 0 1 10 1)
SYMBOL res 672 304 R0
SYMATTR InstName R2
SYMATTR Value 220R
SYMBOL voltage -176 256 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
WINDOW 3 -18 480 Left 2
SYMATTR Value PULSE(0 15 0 1m 9s 1m 10 1)
SYMATTR InstName V2
SYMBOL Misc\\EuropeanResistor 496 352 R0
SYMATTR InstName R3
SYMATTR Value 68K
SYMBOL Misc\\EuropeanResistor 496 528 R0
SYMATTR InstName R4
SYMATTR Value 4K7
TEXT -192 768 Left 2 !.model sw sw()
TEXT -192 800 Left 2 !.tran 0 10s 0 1m