Version 4
SHEET 1 880 840
WIRE 80 -64 -224 -64
WIRE 240 -64 80 -64
WIRE 80 16 80 -64
WIRE 240 64 240 -64
WIRE 80 144 80 96
WIRE 192 144 80 144
WIRE 80 224 80 144
WIRE 240 272 240 160
WIRE 240 272 144 272
WIRE 240 320 240 272
WIRE -224 368 -224 -64
WIRE 80 448 80 320
WIRE 240 448 240 400
WIRE 240 448 80 448
WIRE 448 448 240 448
WIRE 448 560 448 448
WIRE 240 576 240 448
WIRE -224 736 -224 448
WIRE 240 736 240 640
WIRE 240 736 -224 736
WIRE 448 736 448 640
WIRE 448 736 240 736
WIRE 240 800 240 736
FLAG 240 800 0
FLAG 448 448 uopv
SYMBOL nmos 192 64 R0
SYMATTR InstName M1
SYMATTR Value IPB65R420CFD
SYMBOL Misc\\EuropeanResistor 224 304 R0
SYMATTR InstName R1
SYMATTR Value 220
SYMBOL npn 144 224 M0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL voltage -224 352 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 550
SYMBOL Misc\\EuropeanResistor 64 0 R0
SYMATTR InstName R2
SYMATTR Value 1Meg
SYMBOL zener 256 640 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value BZX84C12L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 432 544 R0
SYMATTR InstName R3
SYMATTR Value 10K
TEXT -224 824 Left 2 !.dc V1 0 550
TEXT 520 584 Left 2 ;Belastung durch opv
TEXT -224 -88 Left 2 ;550VDC