Version 4
SHEET 1 960 680
WIRE -432 -544 -464 -544
WIRE -144 -544 -432 -544
WIRE 0 -544 -144 -544
WIRE -144 -528 -144 -544
WIRE 0 -432 0 -544
WIRE -144 -416 -144 -448
WIRE -48 -352 -144 -352
WIRE -432 -320 -432 -544
WIRE -144 -304 -144 -352
WIRE 0 -272 0 -336
WIRE 208 -272 0 -272
WIRE 208 -224 208 -272
WIRE -144 -176 -144 -224
WIRE -112 -176 -144 -176
WIRE 0 -176 0 -272
WIRE 0 -176 -32 -176
WIRE -432 -96 -432 -240
WIRE -432 -96 -464 -96
WIRE -144 -96 -144 -176
WIRE -144 -96 -432 -96
WIRE 0 -96 -144 -96
WIRE 208 -96 208 -144
WIRE 208 -96 0 -96
WIRE 0 -48 0 -96
FLAG 0 -48 0
SYMBOL voltage -432 -336 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0 90 0 .5 0 1)
SYMBOL zener -128 -352 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value 1N5371B
SYMBOL res -160 -320 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res 192 -240 R0
SYMATTR InstName R_Last
SYMATTR Value 10
SYMBOL nmos -48 -432 R0
SYMATTR InstName M1
SYMATTR Value IPB025N10N3
SYMBOL res -16 -192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res -160 -544 R0
SYMATTR InstName R4
SYMATTR Value 1k
TEXT -432 -32 Left 2 !.tran 1