Version 4
SHEET 1 880 680
WIRE 528 16 160 16
WIRE 352 96 160 96
WIRE 496 96 352 96
WIRE 160 192 160 96
WIRE 352 208 352 176
WIRE 496 208 352 208
WIRE 496 208 496 160
WIRE 352 224 352 208
WIRE 160 304 160 272
WIRE 160 304 128 304
WIRE 304 304 160 304
WIRE 64 352 0 352
WIRE -112 368 -208 368
WIRE 0 368 0 352
WIRE 0 368 -32 368
WIRE 0 448 -208 448
WIRE 128 448 128 400
WIRE 128 448 0 448
WIRE 352 448 352 320
WIRE 352 448 128 448
WIRE 528 448 528 16
WIRE 528 448 352 448
WIRE 352 480 352 448
WIRE 0 0 0 0
FLAG 352 480 0
SYMBOL voltage 160 112 R180
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL npn 64 304 R0
SYMATTR InstName Q1
SYMATTR Value 2N2222
SYMBOL Misc\\signal -208 352 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 5 20u 1u 1u 20u 130u 15)
SYMBOL res -128 384 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res -16 352 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL diode 512 160 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL res 336 80 R0
SYMATTR InstName R3
SYMATTR Value 25
SYMBOL nmos 304 224 R0
SYMATTR InstName M1
SYMATTR Value IRFZ44N
SYMBOL res 144 176 R0
SYMATTR InstName R4
SYMATTR Value 150
TEXT -242 504 Left 2 !.tran 1