Version 4
SHEET 1 880 680
WIRE 256 16 -96 16
WIRE 448 16 256 16
WIRE -96 96 -96 16
WIRE 256 96 256 16
WIRE 448 96 448 16
WIRE -96 224 -96 176
WIRE 448 240 448 176
WIRE 576 240 448 240
WIRE 752 240 640 240
WIRE 448 272 448 240
WIRE 16 320 -96 320
WIRE 96 320 16 320
WIRE 256 320 256 176
WIRE 256 320 160 320
WIRE 384 320 256 320
WIRE -96 368 -96 320
WIRE 448 400 448 368
WIRE 560 400 448 400
WIRE 256 432 256 320
WIRE 448 432 448 400
WIRE 752 432 752 240
WIRE 560 448 560 400
WIRE -96 544 -96 448
WIRE 256 544 256 512
WIRE 448 544 448 512
WIRE 560 544 560 512
WIRE 752 544 752 512
FLAG 256 544 0
FLAG 448 544 0
FLAG -96 544 0
FLAG 752 544 0
FLAG -96 224 0
FLAG 256 16 UB_12V
FLAG 752 240 out
FLAG 16 320 in
FLAG 560 544 0
SYMBOL cap 96 336 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL res 240 416 R0
SYMATTR InstName R1
SYMATTR Value 73k
SYMBOL res 240 80 R0
SYMATTR InstName R2
SYMATTR Value 370k
SYMBOL res 432 416 R0
SYMATTR InstName R3
SYMATTR Value 500
SYMBOL res 432 80 R0
SYMATTR InstName R4
SYMATTR Value 2.7k
SYMBOL npn 384 272 R0
SYMATTR InstName Q1
SYMBOL voltage -96 352 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value SINE(0 500m 1k)
SYMBOL cap 576 256 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C2
SYMATTR Value 47µ
SYMBOL res 736 416 R0
SYMATTR InstName R5
SYMATTR Value 4
SYMBOL voltage -96 80 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL cap 544 448 R0
SYMATTR InstName C3
SYMATTR Value 10µ
TEXT -130 568 Left 2 !.tran 10000m