Version 4
SHEET 1 1060 696
WIRE 176 -64 16 -64
WIRE 288 -64 176 -64
WIRE 448 16 288 16
WIRE 176 32 176 16
WIRE 288 32 288 16
WIRE 448 32 448 16
WIRE 16 80 16 -64
WIRE 448 128 448 112
WIRE 288 208 288 144
WIRE 400 208 288 208
WIRE 224 320 224 208
WIRE 224 320 176 320
WIRE 176 368 176 320
WIRE 288 368 288 208
WIRE 16 496 16 160
WIRE 176 496 176 480
WIRE 176 496 16 496
WIRE 288 496 288 480
WIRE 288 496 176 496
WIRE 448 496 448 224
WIRE 448 496 288 496
FLAG 16 496 0
SYMBOL res 272 -80 R0
SYMATTR InstName R2
SYMATTR Value 0.1
SYMBOL nmos 400 128 R0
SYMATTR InstName M1
SYMATTR Value Si4430DY
SYMBOL voltage 16 64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL res 160 -80 R0
SYMATTR InstName R1
SYMATTR Value 390
SYMBOL Eigene\ Symbole\\bcv62 240 112 R0
SYMATTR InstName U1
SYMBOL voltage 448 16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL Eigene\ Symbole\\bcv61 240 448 R0
SYMATTR InstName U2
SYMBOL njf 224 144 M0
SYMATTR InstName J1
SYMATTR Value BF245A
SYMBOL res 160 224 R0
SYMATTR InstName R3
SYMATTR Value 5k6
TEXT 576 40 Left 2 !.dc V1 12 25 
TEXT 576 8 Left 2 !;tran 1m
TEXT 576 72 Left 2 !;op