Version 4
SHEET 1 968 680
WIRE 368 -32 288 -32
WIRE 416 -32 368 -32
WIRE 528 -32 496 -32
WIRE 560 -32 528 -32
WIRE 672 -32 640 -32
WIRE 288 48 288 -32
WIRE 368 48 368 -32
WIRE 432 48 368 48
WIRE 528 48 528 -32
WIRE 528 48 496 48
WIRE 672 64 672 -32
WIRE 112 96 -32 96
WIRE 224 96 192 96
WIRE -32 224 -32 176
WIRE 288 224 288 144
WIRE 288 224 -32 224
WIRE 672 224 672 144
WIRE 672 224 288 224
WIRE 288 256 288 224
FLAG 288 256 0
SYMBOL voltage -32 80 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=0
SYMATTR InstName V1
SYMATTR Value PULSE(0 3.3 0 0.000001 0.000001 0.00005 0.0001)
SYMBOL voltage 672 48 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=0
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL res 400 -48 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName RL
SYMATTR Value 53
SYMBOL npn 224 48 R0
SYMATTR InstName Q2
SYMATTR Value BC817-25
SYMBOL res 96 80 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 1000
SYMBOL res 544 -48 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 11
SYMBOL zener 432 64 R270
WINDOW 0 36 32 VTop 2
WINDOW 3 -4 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value BZX84C10L
TEXT -64 232 Left 2 !.tran 0.001
TEXT -64 280 Left 2 !;tran 0.002